50 Marine Investigations in South Africa. Vol. V. 



prostata of a diameter of 4 mm., the globulous spermatotheca 

 of 2 mm. diameter. 



This form seemed to be a Diaulula and very Hkely a new species. 



2. Diaulula ? morosa, B. n. sp. 

 PL v., figs. 23-26. 



One specimen of this form was found on the shore at Mossel Bay. 



It liad a length of 14 by a breadth of 6 and a height of 3 mm., the 

 height of the rhinophores 1"5, the diameter of the gill-aperture 2-5, 

 and the height of the branchial leaves 1'5 ; the breadth of the foot 

 3'25 mm. — The back of this animal was of a uniform dark greenish 

 gray colour, the foot white. 



The form was elongate-oval, rounded behind and in front with 

 somewhat prominent brim of the villous back ; the lamellae of the 

 rhinophores not thin ; the gill consisting of 10 simply pinnate 

 leaves, protruding from the roundish gill-opening ; the tentacles 

 small; the foot shorter than the back, with prominent brim. 



The back densely covered with rather low villi of a height up to 

 0"2 mm,, stiffened with spicules in and often around them (fig. 23) ; 

 the skin of the back containing masses of dark pigment and many 

 spicules. 



The bidbus pharyngeus 2 mm. long, whitish ; the lip disc with a 

 strong, much folded, colourless cuticle (no armature). The rasp of 

 the tongue nearly colourless, with many rows of plates and many 

 plates in the series ; the plates colourless, reaching a height mostly 

 of 0'016 mm., of the common hook form (fig. 24), the outermost (6) 

 very thin and slender, with short basal plate, reaching a height of 

 0-14 mm. (figs. 25, 26). 



The liver longish, 6 mm. long, clear grayish yellow. 



The anterior genital mass whitish. The penis short, pear-shaped ; 

 the glans short, conical, with yellowish cuticle. 



The generic position of this animal is quite uncertain ; in many 

 respects it would seem to belong to the Diaululidse, but the leaves of 

 the gill are simply pinnate. 



THOEDISA, Bgh. 

 K. Bergh, System, I.e., 1892, p. 1098.— Die Opisthobranchiata d. 

 Siboga Exped., 1905, pp. 121-124. 



Thobdisa punctulifera, B. n. sp. 

 PI. VI., figs. 1-4. 

 In False Bay (Kockland Point bearing NW. J, N. 2^ miles) three 

 specimens were taken by large dredge, together with a species of 



