PLATE VI. 



Fig. 136. Notobrancliaea sp. Larva. Ventral view. 30 . 



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 

 cihated rings. 



Fig. 139. Transverse section through one of the "Mundblasen" of Notobrancliaea inopinata Pels. 



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

 immediately beneath a, with piolongations into c, a reticulated net-work of conncctive tissue 



Fig. 140. Genital organs of Notobrancliaea inopinata Pels. Ventral view. g, gonad; d, its duet; a, muci- 

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



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



Fig. 142. Clione pnnctata n. sp., ventral view. 15 X. 



Fig. 143. Chromatophors of the same. 



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

 buccal connective; pc, cerebro-pedal connective; plc, cerebro-pleural conncctive; plv, pleuro- 

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

 nerve; 2, optie nerve; 3, auditory nerve; 4, nerve to the ventral bueeal eone; 5, nerve to 

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

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



Fig. 145. Basal part of the optie 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; pede, posterior pedal commissure; 8 and 10, 

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

 the pedal ganglion. 



Fig. 147. Paracliojie pelseneeri 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 o{ Paraclione pelseneeri n. sp. 



Fig. I5ii>. Hooks of the same. 



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



d, dorsal; v, ventral; b, bueeal eone; /, labial tentaele; c, cephalic hood ; f, false lips; r, radula. 



Fig- 153- Head and bueeal appendages of Halopsyclie gaudichaudi (Souleyet). Ventral view. 



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

 tentaele; /, fin; //, posterior lobe of the foot. 



Fig. 154. Transverse section through the skin of the same. a, skin, properly so ealled, 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. 



