62 Marine Investigations in South Africa. Vol. V. 



phores standing quite anteriorly ; the back quite even, but with many 

 small nodules at its junction with the margin. The gill-hole far 

 behind, with prominent margin ; the number of leaves of the gill 6. 

 The mouth a fine pore, no visible tentacles. The foot rounded in 

 front, the tail short. 



The central nervous system as usual ; the buccal ganglia (fig. 4) 

 much smaller than the salivary glands. The eyes 0'14 mm. in 

 diameter, with large yellow lens; the otocysts O'lO mm. in diameter, 

 filled with otokonia. The skin full of spicules of the most different 

 sizes, form, and degree of calcification (fig. 3). The most of the long 

 spicules of a diameter up to at least 0-05 mm., mostly smooth, some- 

 times a little thorny, mostly clear, sometimes even blackish. In the 

 interstitial tissue masses of spicules ; as also in the axis of the rhino- 

 phores, but almost none in the lamellae. 



The mouth tube about 4 nun. long, white. The glandula ptyalina 

 about 1 mm. broad, rather thick. The transparent hulhus loharyn- 

 geits (fig. 4a) unusually, nearly 17 mm., long by a general diameter of 

 0'4 mm.; at its hinder end the salivary glands rather large (fig. ibb). 

 The oesophagus rather short and wide (fig. 4c) ; the intestine 6 mm. 

 long. The liver a little flattened, in nearly its anterior half very 

 compressed by the anterior genital mass, yellowish white, 10 mm. 

 long by a breadth of 5, the cleft in the hinder end 1*5 mm. long. 



The hermaphrodite gland clothing the largest part of the liver, of 

 a similar colour, and with ripe genital elements in its lobules. The 

 large anterior genital mass yellow and- white, 6 mm. long by a height 

 and breadth of 4. The form and the armature of the penis as usual 

 (figs. 1, 2). 



This form is specifically different from the D. spiculatar' 



3. DoRiopsis c^siA, B. n. sp. 



An individual was taken by dredge near Roman Eock Lighthouse 

 (SE. ^ S., 1^ miles) from a bottom of sand and shells in a depth of 

 10 fms. 



The living animal is noted to have been " bluish." Preserved, it 

 was whitish with the margin of the back more grayish, the rhino- 

 phores yellowish. The length was 14 mm. by a breadth of 7-5 and 

 a height of 4*5 ; the height of the rhinophores 2, the diameter of the 

 gill 4, the breadth of the brim of the back 3, the breadth of the foot 

 3 mm. 



* B. Bergh, Die Nacktschnecken der Siidsee. Journal d. Mus. Godeffroy, 

 Heft xiv., 1878, p. 37. taf. ii., figs. 13-15. 



