Fig. I. J[. [/nif/l. n. sp. (Zeiss CC. Oc. l.) Seiiii-srheniatir illustration of an ideal transverse section through the anterior 

 part of the proboscis, showing tiie tentacular nerve- ring with some of its pertaining nerves. TJie figure is constructed 

 from a series of transverse sections, and partly drawn under the Camera-lucida. cm', cm", cm'". Nerves running 

 to the oesophageal-ring. o.n., o.n. Root of the 4 oesophageal nerves. t.n. Tentacular nerves, n'. Nerves 

 passing to the walls of the proboscideal canal, m.r. Muscular ring. n.n. Transsccted branches of the first pair of 

 large nerves, n.c. Ganglionic cell pertaining to a parapodial ganglion. 



» 2 — 7, M. giganfemn, n. sp. (Zeiss CC. Oc. 2. Cam.-luc. Borax-carmine. Picric acid.) Transverse sections at small 

 intervals, from a series through the proboscis. Fig. 2. In this fig. the dorsal portion of the tentacular nerve-ring 

 /.*•. is visible, tn, tn. Tentacular nerves, n' , n' . Nerves running to the epithelium of the proboscideal canal, m' . 

 Muscles surrounding the tentacular nerve-ring. m. Muscles under the ectoderm, m.r. Annular muscles surrounding 

 the proboscideal canal. Fig. 3. The anterior extremity of the muscular bulb is transected. The ventral portion 

 {tr.) of the nerve-ring is visible. o.n, o.n. The oesophageal nerves given off" from the ring. o.e. The sensory 

 epithelium of the proboscideal canal, in which, are, also, seen ganglionic cells, cm', cm", cm'". Nerves connect- 

 ing the tentacular nerve-ring with the oesophageal-ring. f, /', /". Fibrillar nerve-cords, communicating with the 

 nerves cm', cm", cm'", and, prol;)al)l_\', also with the nerve-cells (wc.). m', m'. Muscles, occurring in the connective- 

 tissue between the muscular Inilb and the ectoderm. Fig. 5. The nerve-cells are, here, seen to be arranged in 

 more distinct groups (gr^.. gr-., gr^.) especially round the ner\'es cm', and cm", f. Transsected nerve. «.Portion of 

 a nerve running towards the ventral side. lig 6. The oesophageal ring is, here, seen. (_)n one side are seen, 

 the ganglionic cells (a.) situated within .the neurilemma-sheath. gr\ gr-, gy^. Groups of cells, similar to those in 

 fig. 5 ; cells (gr*.) are, also, seen occurring more towards the ventral side. n. Nerve issuing from the oesophageal 

 ring towards the ventral side; it corresponds to n. in fig. 5. Fig. 7. The cells are, here, more numerous behind 

 the oesophageal ring, and the groups are less distinct, o.r. Transsected oesophageal ring in which ganglionic cells 

 are situated. 

 8. A part of the oesophageal ring, from the proximity of a in fig. 6; more magnified (Zeiss F. Oc. 2. Cam.-luc.) 

 n.sk. (Juter neurilemma-sheath. i.nsk. Inner neurilemma-sheath. or. The fibrillar mass of the ring. n.c. Ganglionic 

 cell, whose prolongation can be traced a considerable distance into the fibrillar mass. x. Ganglionic cell in process 

 of division. n.c . Group of ganglionic cells, n.c" . G;inglio:iic cells situated 0.1 the inner side of the ring. m.h. 

 Cuticular membrane of the muscular bulb. 



!' 9. J/ graffi, n. sp. (Zeiss F. Oc. 2. Cam.-luc. Ilæmatoxylin.^ Lateral section of the oesophageal ring. o.r. I'ib- 

 rillar mass of the ring. n.c. Ganglionic cells, situated within the neurilemma-sheath. n.c'. A few of the cells 

 situated behind the ring. n. Portion of a nerve issuing from the ring, and directed forwards. 



■ 10. M. giganteum, n. sp. (Seibert hom. im. '/is Zeiss. Oc. I. Cam.-luc. and reduced to half size. Osmic acid. Hæmatox}-- 

 lin). Portion ot a horizontal section showing ganglionic cells, situated laterall}-, behind the oesophageal ring {or.). 

 n. Nerve projecting forwards. n.c. Unipolar cells whose prolongations are, principally, directed forwards, n.c . 

 Multipolar cells whose prolongations are, principalh-, directed backwards towards the epithelium of tlie stomach 

 (m. e.). n.s. Nervus sympathicus (.'). m.h. Muscular bulb. 



