The Ojnsthobranchiata of South Africa. 43 



meniscus-form, 14 mm. long by a height of 11 and a breadth of 5, 

 yellowish white and white ; the spermatotheca pear-shaped, 5 mm. 

 long, the spermatocysta globular, of 3 mm. diameter ; the efferent 

 ducts without any trace of armature. 



This form seems to belong to the genus Archidoris, 



2. Archidoris granosa, B. n. sp. 

 PI. v., figs. 16-18. 



At Tongaati Eiver mouth (NW. by N. ^, N. 5^ miles) an individual 

 was procured by large dredge, from a depth of 36 fms. and hard 

 ground (December 20, 1900). Two others were procured at Wood- 

 stock beach (Table Bay). 



They were very hardened and quite stiff, 20-25 mm. long by a 

 breadth of 13-19 and a height of 0-8-1-0, the breadth of the brim of 

 the back 3-4, that of the foot 8-10, the tail 3-4 mm. long. — The 

 colour of the living animal seems to have been yellowish, but is now 

 a yellowish white. 



The form as usual : the back all over covered with more or less 

 small nodules of a diameter up to 7"5 and a height to 0-75 mm. 

 (fig. 16) ; along the middle of the back sometimes a series of 

 somewhat larger nodules, which formed a sort of median crest ; 

 the gill seemed formed of 8-leaves about 2 mm. high (when 

 retracted). 



The eyes, which were nearly sessile, of a diameter of 0*08 mm. 

 with large yellow lens ; the otocysts of a diameter of 0'08, full of 

 otokonia. The skin everywhere with masses of hard spicules, which 

 ascended through the nodules of the back. 



The whitish bidbus pharymjcus with prominent rasp-sheath 4-6 

 mm. long by a height of 4-5 and a breadth of 3-5-4; the lip disc 

 covered with a strong colourless cuticula. The very slightly 

 yellowish rasp of the tongue seemed to contain 25 series of plates, 

 the rasp-sheath 20, the total number of rows thus being 45. The 

 plates colourless ; the height of the outermost (fig. 18), about 

 0"06 mm., rising to 0'22 ; of the common hook-shaped form 

 (fig. 17). 



The large stomach 8 mm. long by a breadth of 3-5, very projecting ; 

 the liver yellowish white. 



The form here examined seems to be an Archidoris, but could not, 

 on account of its hardened state, be sufticiently examined. It would 

 perhaps be preferable not to give a specific denomination. 



