PLATE VI. 



Fig. 136. Notobranchaca sp. Larva. Ventral view. 30 X- 



Fig. 137. The same, dorsal view. 30 • . 



Fig. 138. Dorsal view of the aboral extremity of the same, showing the cutaneous glands, and the two 

 ciliated rings. 



Fig. 139. Transverse section through one of the "Mundblascn" of Notobranchaca inopinata Pels. 



a, a layer of epithelial cells with flat nuclei, at the periphery; /;, layer of glandular cells, 

 immediately beneath a, with prolongations into c, a reticulated net-work of connective tissue 



Fig. 140. Genital organs of Xotobranchaca inopinata Pels. Ventral view, g, gonad; (/, its duct; a, muci- 

 parous, b, albuminiparous gland; v, vas deferens. 



Fig. 141. Penis of the same, invaginated. See text. 



Fig. 142. Clionc punctata n. sp., ventral view. 1 5 X. 



Fig. 143. Chromatophors of the same. 



Fig. 144. Central nervous system of Clionc liniacina Phipps. Dorsal view, c, cerebral ganglion; be, cerebro- 

 buccal connective; pc, cerebro-pedal connective; pic, cerebro-pleural connective; plv, pleuro- 

 visceral connective; p, pedal ganglion;//, pleural ganglion; v, visceral ganglion; i, olfactory 

 nerve; 2, optic nerve; 3, auditory nerve; 4, nerve to the ventral buccal cone; 5, nerve to 

 the labial tentacle; 6, nerve to the dorsal, 7, to the middle cone; 11, pedal nerve, forming 

 a plexus with 12, pleural nerve, to the cervical region; 14, 15, 16, nerves from the visceral ganglia. 



Fig. 145. Basal part of the optic nerve, with the two elongated swellings. 



Fig. 146. Pedal ganglia of the same. Dorsal view. For the completion of fig. 144. pc, cerebro-pedal 

 connective; apdc, anterior pedal commissure; pcdc, posterior pedal commissure; 8 and 10, 

 nerves to the lobes of the foot; 9, nerves to the fins; 13, nerve from the ventral surface of 

 the pedal ganglion. 



Fig. 147. Paraclione pclseneeri n. sp. Ventral view. 20 • . 



Fig. 148. Another specimen of the same species. Same view. 30 X. 



Fig. 149. A third specimen. Same view. 15 . 



Fig. 150. A fourth specimen. Same view. 20 X. 



Fig. 151^. Radula of Paraclione pclseneeri n. sp. 



Fig. 151 i?. Hooks of the same. 



Fig. 152. Oral aspect of the head of the same. 



d, dorsal; v, ventral; /', buccal cone; /, labial tentacle; c, cephalic hood; /, false lips; r, radula. 



Fig. 153. Head and buccal appendages of Halopsychc gaudichaudi (Souleyet). Ventral view. 



ba, buccal appendage; //, labial tentacle; al, anterior lobes of the foot; o, mouth; nt, nuchal 

 tentacle; _/", fin; pi, posterior lobe of the foot. 



Fig. 154. Transverse section through the skin of the same, a, skin, properly so called, b, reticulated 

 tissue, between the skin and the visceral nucleus; i, pavement epithelium; 2, 3, 4, several 

 forms of dermal glands. See text. 



Fig. 155. Radula of the same. 



Fig. 1^6 A, B, C. Horny plates of the jaws of the same. 



