38 



longitudinal course (g. m. ; il attaches itself to the distal body-wall and may be considered a 

 protractor. Moreover there is a strong dorsal retractor (d. /-. i, which divides more proximally 

 into two and attaches itsell to the dorsal body-wall. Then there are also 2 lateral retractors 

 (/. rd, attaching themselves to the lateral body-wall and 2 ventral ones, having the same 

 relation to the ventral wall [v. r.). 



The following must be noticed as regards the alimentary canal. Around the mouth- 

 opening there is a broad cuticle ("Mundschild" Wirén) cf. figs. 186 — 188 c\ in one of the 

 specimens this is almost entirely round, in the other it is somewhat V-shaped. The mouth can 

 be retracted, the mouth-opening lying consequently in a cavity, as is the case with only one 

 ot' the specimens (fig. 1 8S <•?) and not with the other (fig. 187). Around the "Mundschild" a great 

 number oi spicula are implanted (fig. 183 B). The mouth-opening itself is slitlike and narrow. 



The narrow pharynx has 4 small salivary glands, as in Chaetoderma nitidulum, but 

 1 cannot indicate any buccal glands. lts muscular layer is extremely thin. Fig. 1S9 represents 

 the place where the pharynx passes into the intestine ; the latter is provided with a small 

 proximal coecum, as is the case in most of the Xeomeniidae. 



The radula deserves mention. Figs. 191 and 192 represent the radula of one specimen, 

 figs. 193 and 194 that of the other (cf. Kowalevskv 13, hg. 1, 24 — 27 and Wirén 6 a Plate V, 

 fig. 15). The large radular tooth dt is present as well as the 2 large pieces d. The httle 

 chitinous teeth, directly obvious in the sections on account of their yellow colour, are clearly 

 separatecl from them. In both specimens there are 2 large sickle-shaped cuticular pieces a, 

 which support little curved teeth. Moreover in both specimens an oblong piece b is found. 

 'I hey also possess a number of fragments, the original situation of which we can no more tracé 

 T course. The resemblance the}- present to other forms of Chaetoderma will be discussed 

 afterwards. 



The intestine and the rectum do not furnish any peculiarities. As regards the liver, 

 Chaetoderma Lovéni presents greater similarity to Chaetoderma nitidulum than to Chaetoderma 

 radulifera. The liver is very large and extends from a place close behind the head to a good 

 way tlistally (fig. 195 /). It is so strongly developed as to push away the intestine; the latter is 

 present only in the shape of a very narrow tube (/). "Körnerzellen" as well as "Keulenzellen" 

 (Wirén) can be demonstrated, but I am as vet not certain about their situation. 



Of the nervous system I will only mention the cerebral ganglion and the ganglion 

 posterius superius. Fig. 203 represents the cerebral ganglion li.g. ; the nuclei are found at the 

 periphery, the fibrillae more in the centre. To this cerebral ganglion 6 smaller ganglia are 

 attached, 4 of which are lateral (j, _/, 5, 6) and 2 proximal (/, 2). The shape of the cerebral 

 ganglion corresponds to that of Chaetoderma nitidulum, whilst the 6 round ganglia are called 

 by Wirén the "lobi laterales and anteriores". For Chaetoderma Lovéni however the separation 

 between the latter and the cerebral o-aiis-hon is much more distinct. 



Around the mouth-opening numerous buccal ganglia are met with (figs. 186 — 187). 



\\ e must notice the situation of the ganglion posterius superius, which is found dorsally to 

 the rectum (fig. 199). It is a remarkable fact, that the two distal offsets of the pericardium unite and 

 enclose the ganglion posterius superius, which lies therefore in the pericardium (fig. 201 G. p. s.). 



