3^ 

 longitudinal course {£: ;//.); it attaches itself to the distal body-wall and may be considered a 

 protractor. Moreover there is a strong dorsal retractor {d. r.), which divides more proximally 

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

 (/. r.), 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" Wir£n) cf. figs. 186 — i88r; 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 

 of the specimens (fig. iBBfl) and not with the other (fig. 187). Around the "Mundschild" a great 

 number of 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 

 I cannot indicate any buccal glands. Its muscular layer is extremely thin. Fig. 189 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 Neomeniidae. 



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, fig. 1, 24 — 27 and Wirex 6=* Plate V, 

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

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

 separated 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 6 is found. 

 They also possess a niunber of fragments, the original situation of which we can no more trace 

 ^f course. The resemblance they 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 Loveni presents greater similarity to Chaetoderma nitidulum than to Chaetoderma 

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

 way distally (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 (/). "Kornerzellen" as well as "Keulenzellen" 

 (WiR^x) can be demonstrated, but I am as yet 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 /i.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 Wirex the "lobi laterales and anteriores". For Chaetoderma Loveni however the separation 

 between the latter and the cerebral ganglion is much more distinct. 



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



We 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 j)osterius superius, which lies therefore in the pericardium (fig. 201 G. />. s.). 



