32 Marine Investigations in South Africa. Vol. V. 



described by Vayssiere, much shorter than in the typical species 

 (cf. I.e., p. 49, fig. 232). 



Perhaps the form here examined is really the PI. capensis of 

 Vayssiere. 



Pleurobranch^a capensis, Vayssiere, var. 

 PI. XI., figs. 1-8. 



One specimen was found off Cape Hangklip ; in its mouth an 

 annelide, 11 mm. long, was sticking. The state of preservation was 

 not good. 



It was uniformly coloured whitish. Its length about 18 mm. by a 

 breadth of 10 and a height of 6 ; the breadth of the frontal veil (with 

 the 3 mm. long tentacles) 10 mm. ; the height of the rhinophoria 

 2-5; the gill 5 mm. long by a breadth of 3; the penis projected 2*5, 

 the praebranchial papilla 0*8 mm. ; the breadth of the foot 10 mm., 

 the tail 3 mm. long. 



The form as usual. On the margin of the frontal veil very slight 

 traces of papillae ; the back quite even. On the somewhat prominent 

 genital papilla were situated the rather projecting penis in front and 

 the female opening behind ; between the genital papilla and the gill 

 the prominent praebranchial papilla. The gill with about 20 leaves 

 on each side, its hindmost part (2 mm. long) free; at the base of this 

 pai"t the anal papilla; under the middle of the gill the fine renal 

 aperture. The tail without finger-like papilla ; its gland not 

 pronounced, about 2 mm. long. 



The intestines were not visible through the walls of the body. 



The central nervous system as in other Pleurobranchseae. The 

 large eye of a diameter of 0'28 mm. 



The mouth tube 2 mm. long, wide. The bulbus pharyngeus whitish, 

 but its inside and the palate black ; the length 6 by a breadth of 4-5, 

 and a height of 3 mm. ; the rasp-sheath 1-5 mm. projecting. The 

 mandibular plates longish, 3 mm. long, clear yellow ; their elements 

 as in other Pleurobranchaeae, of a height up to 0*20 mm. by diameter 

 of 0*045 ; they were mostly hexagonal, the free facet in the anterior 

 margin finely denticulated, the number of the denticles commonly 

 8-10 (figs. 1-2). The broad tongue with very pale yellowish radula 

 with about 25 series of plates, in the sheath 20, the number of series 

 being thus 45 ; the number of plates on each side amounted to 50. 

 The plates (tigs. 3-6) colourless, of the usual form, the length of the 

 largest 0'30, their height 0'20 mm. ; the length of the outermost 

 (fig. 6) 0-10 mm., the denticle of these last sometimes very short. 



The proper glandula salivalis white, transversely ovate, 1*5 mm. 



