48 Marine Investigations in South Africa. Vol. V. 



The colour of the back yellowish, that of the gill a little darker ; the 

 body otherwise whitish ; the white intestines were visible through 

 the hind part of the back and of the sides. 



The form as usual. The rhinophores standing very far forwards, 

 with prominent sheaths, the club with about 15 lamellae. The back 

 nearly quite even w^ith rather broad brim ; the gill consisting of 

 6 leaves, standing very far backwards. The tentacles short, finger- 

 like ; the foot rather large, with prominent brim ; the tail short. 



The central nervous system as usual. The eyes, with yellow lens, 

 of a diameter of 0'16 mm. ; the otocysts of a diameter of 0*09, nearly 

 filled by a mass of otokonia mostly of a diameter of 0-008 mm. In 

 the skin (of the back) a number of scattered spicules which were not 

 long nor very much calcified ; almost none in the lamellae of the 

 club of the rhinophores. 



The yellowish hulhus ijhar7jngeiLS about 3 mm. long, so hardened 

 that a sufficient examination was quite impossible. The yellow lip 

 plates (fig. 2) composed of closely packed rods of a height up to 

 0-035 and a diameter of 0-009 mm. The rasp seemed in its rows to 

 contain about 30 more regular and 10-15 quite thin plates on each 

 side of the naked rather narrow rhachis. The plates nearly colourless, 

 transparent, hard, rising to a height of 0-33 mm. The plates erect, 

 fixed to the cuticula only by their lower end ; the plates of the 

 larger inner part of the rows strong, of peculiar hook form (figs. 3, 4), 

 with a strong outer border ; the smaller outer part (fig. 5) showed, 

 without any transition, merely very thin rather long plates. 



The liver yellowish- white. The whiter hermaphrodite gland 

 covering the largest part of the liver ; in its lobules were ripe 

 genital elements. The anterior genital mass white ; the penis 

 seemed to be unarmed. 



The animal seems to belong to the genus Geitodoris. 



DIAULULID^. 



E. Bergh, System. I.e., 1892, p. 1097 (-1100).— Die Opistho- 

 branchiata d. Siboga Exped., 1905, pp. 118-136. 



DiAULULA, Bgh. 

 E. Bergh, System, 1892, p. 1097. — Die Opisthobranchiata, I.e., 

 1905, pp. 118-121. 



1, DiAULULA CAPENSIS, B. n. sp. 



PI. v., figs. 19-22. 

 At Mossel Bay (Seal Island, S. by W., 1^ miles) one individual 

 was dredged from a depth of 11 fms. with bottom of sand and shells. 



