Fig. I. 31. cirrifcnini, F. S. L. (Zeiss F. Oc. i. Cam.-luc, and reduced to half size. Hæmatoxylin.) From a horizontal 

 section, showing the connection between the oesophageal ring and the tentacular nerve-ring (<.r.). The connecting nerve 

 is composed of two branches, having their roots in different ])arts of the oesophageal ring {or., or'., or".), n.c. Unipolar cells whose 

 prolongations are directed forwards, n.c. Cells, situated within the neurilemma-sheath. nc". Multipolar cell with one pro- 

 longation directed towards the epithelium of the stomach (me.), a. Point where the jjrolongations of several unipolar cells 

 converge and pass into the fibrillar mass of the oesophageal ring. n.s. Nervus sympathicus (r). m.b. Muscular bulb 

 » 2. M. gratfi, n. sp. (Zeiss A.'\. Oc. 2. Cam.-luc. Hæmato.vylin.) Trans ,-er.se section of the muscular bulb consisting of 



radial, and annular, muscles. The latter form, with the former, a basket-work plaiting indicated, schematically' in the figure 

 (vide, also, PI. JII). h. K.xterior cuticle ot the muscular bulb; on the interior side, the muscular mass is separated by a 

 similar cuticle from the sensory oesojihageal epithelium {o.e.), the subjacent muscles, and the oesophageal nerve (on) 

 k. Connective-tissue nuclei, a. Transsected dorsal ridge (the opposite ventral ridge is not lettered) 

 » 3. M. iiiganteum, n. sp. (Zeiss CC. Oc. 2. Cam.-luc. Osmic acid. Hæmatoxylin.) Horizonal section, through the ventral 



portion of the j^roboscis. tr. Transsected tentacular nerve-ring, from which nerves {n.) issue to the walls of the proboscid 

 eal canal, in., tn. Tentacular nerves, transsected at different points of their course, and' seen passing, one on each side into 

 the tentacles. m.h. Section of a small ventral, anterior, portion of the muscular bulb 



4. M- gratfi n. .«p (Zeiss CC Oc. 2. Cam.-luc. Picro-carmine). Part of a longitudinal section, showing the origin of 

 an oesophageal nerve (on.); its root is <ompo.sed of several branches (a.) whose fibres converge from both sides of the 

 tenta<:ular nerve-ring (tr.). tn. Root of a few tentacular nerves. The oesophageal nerve (on.) is longitudinally divided bv 

 a septum, n. Oesophageal nerve-branch, m.h. Muscles of the muscular bulb. ' 



5. M. giganteim, n sp. (Zeiss F. Oc. 2. Cam..luc..) Horizonal section of a tentacle of the proboscis which receives a 

 tentacular nerve (tn.) that loosens itself out, into fibres, at_ the extremity of the tentacle. .\ few nuclei occui towards the 

 extremity (a) of the tentacle. I. Elongated nuclei. e. Epidermic cells of the outer side of the tentacle (N B Bv a 

 printers error the indicative line has been run to the subjacent connective-tissue, e'. Inner epidermic cells 



6. 31. graffi, n. sp. (Zeiss F. Oc. 2. Cam.-luc. Picro-carmme.) Portion of a tran.sverse section of the anterior proboscis 

 //■ lentacular nerve-ring. n.c, n.c. Nerve-cells, the latter communicating with the tentacular nerve-ring; some of the 

 cells are seen to be situated in vacuoli and, then, they are surrounded by an inner layer of connective-tissue (6 ) whilst 

 the vacuoh themselves are surrounded by a separate outer layer (a.). Along the upper margin of the figure, the probosc- 

 ideal epithelium is seen; on the inner side af n.c., a tentacular nerve-root is visible. 



7- M. graffi. n. sp. (Zeiss F. Oc. 2. Cam.-luc. and reduced to half size.) Portion of a horizontal section of the anterior 

 proboscis. tr. Tentacular nerve-ring, in., tn". Tentacular nerve-roots, n. Nerve passing to the wall of the proboscideal 

 canal. «Part of an oesophageal nerve-root. n". Nerve connecting the oesophageal and tentacular nerve-ring nc Nerve- 

 cell, in whose membrane nuclei are visible. Nerve-cells are frequendv seen situated in vacuoli (,«., a a ) m Muscles 

 situated alongside the tentacular ring. e. Proboscideal epithelium, under which there is a dermal muscular layer (em) 

 diminishing, gradually, towards the anterior extremity. ^ ■ ■/ 



8. 31. graffi, n. sp (Seibert hom. im. '/,« Zeiss Oc. i. Cam.-luc. and reduced to half size.) Horizontal section of the 

 sensory epithelium, of the proboscideal canal. o.«. Oesophageal nerve. I. Vacuolus. p.,p'.,p". Elongated epithelial 

 cells with grannular nuclei, and prolongations communicating with nervous fibrils. The nucleus in p" . contains 2 nucleoli 

 w.c Ganglionic cells, m. Muscles, cii. Cuticulum. „. The inner cuticular membrane of the muscular bulb m h Muscular- 

 bulb muscles. 



9- J/- graffi, n. sp (Zeiss F. Oc. i. Cam.-luc. and reduced to half size.) Portion of longitudinal section of an oesopha- 

 geal nerve, with its branches («., «.). m. m. Muscles. ' 

 » 10. 31. graffi, n sp (Zeiss F. Oc. i. Cam-Iuc. Hæmatoxylin.) Portion of transveise section of the epithelium in the inter- 

 ior proboscideal canal, n. Nerve passing into the epithelium. a. Constricted nucleus (presumably in process of direct 

 division), m.r. Annular muscles. • 



y II. 31. graffi, n. sp. (Zeiss F. Oc. 2. Cam.-luc. Hæmatoxylin.) Portion of transverse section of the epithelium of the 

 proboscideal canal at the point where an oesophageal nerve (on.) enters, p. Epithelial cells, whose prolongatii^ns com- 

 municate with fibrils of the nerve, cu. Cuticulum. m.r. Muscles. 



■■> 12. 31. graffi, n. sp. (Zeiss F. Oc. 2. Cam.-luc. Hæmatoxylm.) Portions of transverse sections, showmg ganglionic cells 

 occurimg in the sensory epithelium of the proboscideal canal, a. The cell, here, contains two nuclei, b and c show 

 tumefactions in the cellular membranes, p. Large nucleus in the sensory epithelium 



^ 13. 31. gigantcnm n. sp. (Zeiss F. Oc. i. Cam.-luc. Borax-carmine. Picric acid.) Portion of a transverse section of the 

 epithelium of the oesophagus in the posterior proboscis, where the oesophageal nerves (o.n.) relinquish it. n c Ganglionic 

 cells seen situated, frequently, in small groups over the nerves. 



' 14. 3L giganteim, nsp. (Zeiss CC. Oc. 4. Cam.-luc. Borax-carmine. Picric Acid.) Transverse section of the sensory 

 epithelium of the proboscideal canal, n.c. Ganglionic cells situated, especially, over the oesophageal nerves (o.n.) p 

 Sensory ei>ithelial cells. ^ \ J l'- 



» 15. 31. gipai>fei,m, nsp. (Zeiss F. Oc. 2. Cam.-luc. Osmic acid. Hæmato.xylin.) Ganglionic cell situated in the epithel- 

 ium ol the oesophagus, at the posterior extremity of the proboscis. Horizontal section 



» 1 6. 31 ciruferum, F. S. L. (Zeiss CC. Oc. 2. Cam.-luc. Hæmatoxylin.) Portion of a horizontal section through one 

 side ot the posterior proboscis, o.n. An oesophageal nerve that relinquishes the oesophageal epithelium and doubles round 

 the posterior extremity of the muscular bulb; I have not been able to determine whether it is connected with the oesoph- 

 ageal ring (o.r.) or not. n.c. Ganglionic cells, cm. Nerve connecting the oesophageal ring with the tentacular nerve-ring 

 m.n. Nerves running from the oesophageal ring to the e|3ithelium (w.e.) of the interior stomach, n.s. Nervus sympathicus (-) 



» 17. M. graffi, n. sp. (Zeiss CC. Oc. 2. Cam.-luc.) Portion of a horizontal section through one side of the posterior ijro- 

 boscis. o.r. Franssected oesophageal ring; on the inner side of its neurelemma-sheath ganglionic cells (ne') occur At 

 the posterior extremity of the proboscis, much distant from the oesophageal ring, ganglionic cells (n.c.) are situated 

 annularly, (vide nc. fig. 20) having their prolongations principally directed towards the oesophagus, n. Transsected nerve 

 origmating m the oesophageal ring. 0. n. Oesophageal nerve doubling round the muscular bulb (mh^ mn Nerve 

 passing to the epithelium of the anterior stomach. 



" '^' f-.Sraffin.sp. (Zeiss F. Oc. 2. Cam.-luc. Hæmatoxylin.) Transverse section of an oesophageal nerve which is 

 divided by a connective-tissue septum (a.). Jc. Connective-tissue nuclei situated in the sei^tum. n.c Nerve-cell also situ- 

 ated in the septum, p. Sensory epithelial cells, m. Muscles. 



» 19- 31. giganfeum, n sp. (Zeiss F. Oc. i. Cam.-luc. and reduced to half size. Osmic acid. Hæmatoxylm.) Portion of trans- 

 verse section ot the epithelium of the stomach, where nerves (n.) enter into the epithelium, n.c Nerve-cell 



» 20. M. graffi n. sp. (Zeiss C. C. Oc. 2. Cam.-luc.) Portion of horizontal -ection through the dorsal part (o.r.) of the 

 oesoi)hageal ring. n.c. The ganglionic cells distant from the oesophageal ring, refened to in fig it (nc) The pro- 

 longations of the cells are directed towards the oesophagus and the anterior stomach, m.c. Epithelium of the stomach. 

 w. Muscles. ' 



■' 21. 31. graffi, n. sp. (Zeiss F. Oc. i. Cam.-luc. and reduced to half size.) Portion of a transverse section, showing the entrance 

 01 a nerve (n.) originating m the tentacular nerve ring, into the muscular bulb. n. Nerve which enters the muscular-bulb, 

 more j.osteriorly than n. m. Radial muscles, m'. Annular muscles 



' "■ f 'ik'"'"/^' /'" *^:, ^^''.'T ^- ^''- '• Cam.-luc.) Portion of a transverse section, showing the entrance into the muscular 

 Duib 01 a branchlet (n .) from a nerve-branch (n.) issuing from an oesophageal nerve, cu. Cuticulum. p. Ei)ithelial cells. 

 23. M. gjgantemn, n. sp (Zeiss CC. Oc. i. Cam-luc. Osmic acid. Hæmato.xylin.) Portion of a horizontal section through 

 the dorsa part of the posterior proboscis, o.r., o.r. Oesojjageal ring. n.c. Ganglionic cells. «., n'. Nerves running to 

 the epithelium (m.e.) of the anterior stomach. Ganglionic cells (g) are situated in the epithelium, n. Nerves running back- 

 wards trom the oesophageal ring. m.b. Muscular bulb. 



