14 Marine Investigations in Son,t]i Africa. Vol. V. 



thin, colourless hooks (fig. 24) up to the height of 0*08 mm. by 

 diameter of 0-007-0-016. 



The rasp of the strong tongue yellow, with 18-19 series of plates, 

 in the sheath 17-18, the total number of series thus being 35-37. 

 In the series 17-18 lateral plates on each side of the median. The 

 plates yellow, the median 0'28 mm. broad ; the length of the four 

 outermost 0-6-0-14-0-16-0-20. The median plates (fig. 4) of the 

 usual form, with finely denticulated hook and 2-3 denticles at its 

 base. The lateral plates of the usual form (figs. 5-7), the three 

 outermost without any trace of hook, the next with a rudiment, the 

 following of the usual form, but the hook without denticles, which 

 begin on the sixth to eighth (figs. 6-7). 



The oesophagus in its posterior half developed into a proventriculus. 

 The masticatory stomach nearly cylindrical, stiff, 3 mm. long by 

 diameter of 4 ; in both individuals eight larger pyramids, bright 

 yellowish up to 2 mm. high, and four smaller, more irregular, mostly 

 bluntly conical. 



The liver yellowish white, on section yellow, 2 cm. long by a 

 height of 1-5 and a breadth of 1"3-1"5 ; a small whitish gall- 

 bladder was very distinct. 



A branchio-reual pore was very distinct deep under the root of the 

 gill. The sub-branchial gland well developed. 



The hermaphrodite gland white. The proper albumino-mucous 

 mass 9-10 mm. long by a height of 7-9 and a thickness of 4 ; the 

 sperm-oviduct 10 mm. long ; the globular spermatotheca of a 

 diameter of 5 mm. The penis long, whitish, at its hinder end a small, 

 apparently glandular, appendix (fig. 3a). (No armature, neither of 

 the small whitish glans nor of the praeputium.) 



The form here examined seems to represent a new species. 



II. DOLABELLA, Lam. 



Lamarck, Syst. des Anim. s. Vert., 1801, p. 62. 



Cuvier, Mem. sur la Dolabella &c., Ann. du Mus. v., 1804, p. 435. 



Bang, Hist. Nat. des Aplysiens, 1828, pp. 45-49, pi. i.-iii., xxiv., 



fig. 1. 

 Bergh, Die Opisthobranchiaten der Siboga Expedition, 1905, 



pp. 13-20. 



Corpus postice latius oblique truncatum ; parapodiis brevioribus, 

 apertura branchiali breviori angustiori. Testa pro majore parte 

 nuda, fortior, nonnihil securiformis, margine sinistro crassiori, 

 postice angustior, dextrorsum emarginata et parte nucleali deorsum 

 iucurvata carina postica prominenti iustructa. 



