ELIOT : NUDIBRANCHIATA FEOM CAPE VERB ISLANDS. 137 



The rhinophore openings are on small hillocks, but there are no 

 projecting sheaths. The branchial pocket is nearly closed, and not at 

 all raised. It was possibly stellate when open. There are four 

 branchiae and an asymmetrical small plume. The rhachis is stout ; the 

 ramifications scanty, and mostly only bipinnate. The foot is con- 

 siderably shorter than the body, with a wide margin. It is much bent 

 and contracted, but measures about 1 5 by 7 mm. It is apparently 

 grooved and notched in front. The tentacles are digitate, with a slight 

 groove on the outside. 



The internal organs are mostly white. The labial armature consists 

 of two hatchet-shaped plates, which might also be possibly regarded as 

 representing a circle with two processes extending backwards. The 

 constituent elements are minute rods of rather irregular shape, often 

 swollen at the ends. The radula is narrow and of rather unusual 

 appearance. There are 51 rows, containing not more than 16 or 17 

 teeth on each side of the bare rhachis. The teeth are rather straight 

 and broad, and those in the middle of the half-rows are almost spoon- 

 shaped and hardly hamate in appearance. The innermost and outermost 

 teeth are smaller. The bases are long, especially those of the 

 innermost teeth. Such stomach as there is appears to be wholly 

 outside the liver, but it is very small and merely a dilatation of the 

 general digestive tract. Both it and the intestine are thickly laminated 

 inside. The liver is greyish, not very compact, and with manj' lacunae. 

 It is clothed with the dead-white follicles of the hermaphrodite gland. 

 The connecting tubes between the follicles are more distinct than usual. 



The renal organ is very distinct and exhibits beautifully dendritic 

 ramifications. The blood-gland is double and much lobed, especially 

 the anterior portion. The central nervous system is granulate and 

 enclosed in a strong capsule. The ganglia could not be clearly 

 separated. 



The genitalia appear to be as usual in the genus. A spermatotheca, 

 spermatocyst, and prostate were found, but no armature. There is 

 perhaps an accessory folliculate gland in the vestibule. 



The second specimen is externally as described by Mr. Crossland. 

 The white blotches are somewhat raised and almost tubercular. The 

 branchiae are four, but one is bifid. The tentacles have a slight but 

 distinct groove on the outer side. 



These specimens may be referred with some certainty to Bergh's 

 Biscodoris indecora, recorded from Trieste, with which they agree not 

 only in general characters, but in such details as the narrow radula and 

 grooved tentacles. 



DiscoDORis MUTA, Bergh. 



Biscodoris muta, Bergh: Semper's Eeisen, Heft xii, 1877, pp. 532-4. 



One specimen. The notes on the living animal are as follows : — 



" Dorid, large grey. Under a stone (Gastropod shell mass), Boa Vista. 



" Leathery but not harsh to the touch. Foot broad, mantle moderately 

 so, of wavy outline and rather mobile. 



" Gills of moderate size, tripinnate. Rhinophores stand vertically. 

 Both pockets close completely, edges a little raised when open. The 



VOL. VII. — SEPTEMBER, 1906. 10 



