S4 Marine Investigations in South Africa. Vol. V. 



convexity of 2-5 ; the length of the hinge 2 mm. (fig. 12) ; the 

 masticatory edge not broad with some small and usually 4-5 series 

 of clumsy denticles (fig. 13), reaching a height of 046 mm., the 

 masticatory process rather short (fig. 12a). The tongue large, as 

 usual, quite hardened, so that neither the number of rows of plates 

 in the colourless radula nor in the sheath could be determined ; the 

 number of plates also in the rows could not be ascertained ; it seemed 

 to be rather considerable. The median as well as the first lateral 

 plates yellowish, the rest colourless ; the median plates of a breadth 

 of 0-28 mm., the length of the first lateral 0"26, the height of the 

 lateral rising to 0'28 mm. The median plates (fig. 1) of the usual 

 form, as well as the first lateral (fig. 1) and as the following (fig. 14) ; 

 towards the margin of the rasp the plates were sometimes of different 

 form (fig. 15). 



The salivary glands as usual. The oesophagus posteriorly dilated 

 into a kind of stomach of a length of 8 mm. by a diameter of 4 ; the 

 intestine as usual. The alimentary tract quite empty. The posterior 

 visceral mass {liver) 2-5 cm. long by a diameter of 1, conical, the 

 anterior end obliquely truncate (for the anterior genital mass) ; its 

 substance grayish, covered nearly all over by the thick layer of 

 yellow hermaphrodite lobes. 



In these last were ripe genital elements. The anterior genital mass 

 somewhat globular, 10 mm. long by 7 in diameter ; the very strong 

 ampulla of the hermaphrodite duct with its two coils constituting at 

 least a fourth part of the whole mass ; the seminal vesicle longish 

 (5*5 mm. long); the albumino-mucous gland yellowish and whitish. 



The form here examined is very probably the Trit. pallida of 

 Stimpson. 



A smaller individual was procured by dredge at Cape Morgan, 

 another by shrimp-trawl off Great Fish Point Lighthouse. 



They were 18-21 mm. long by a breadth and a height of the body 

 proper of 5-6 ; the height of the gills reached 2-5-3 mm. The colour 

 was (yellowish) white, along the side of the body (as mentioned by 

 Stimpson) ran a thin white line. On the right side the intestine 

 shone grayish through and behind the yellowish white hermaphro- 

 dite gland. The frontal veil showed all in all 10 digitations, and the 

 margin of body 10-15 on each side. 



The markedly whitish bulbus pharyngeus 5'9 mm. long. The 

 yellow mandibles quite as above. The radula colourless, containing 

 38 series of plates, in the sheath 13, the total number of rows thus 

 being 46. On each side of the median plates 32 lateral. The plates 

 colourless, the breadth of the median 0'14 mm. 



