ELIOT : NUDIBRANCHIATA FROM CAPE TERD ISLANDS. 141 



with red sponge and red Alcyonarian. 8 bipinnate gills, some showing 

 tendency to become tripinnate. 



"August 17. 5 specimens under a lighter, in company with red 

 sponge of same tint as the Dorid. 



" Brilliant vermilion, about 1^" by |-". Colour, at first sight, appears 

 uniform, but under a lens (mag. 10) ai'e seen numerous specks of black 

 pigment, most numerous on the. visceral mass, less so on the mantle. 

 The skin is pitted sparsely on mantle, but on the body the pits 

 are very numerous, so that this part appears to be covered with 

 a raised vermilion network, blunt papillae being situated at the larger 

 junctions. In some specimens these are more numerous and better 

 developed than in others. The pigment- specks are much more numerous 

 in the pits, so that they are a dark grey, throwing up the red network 

 surrounding them. The ends of the rhiuophores and the anterior gills 

 are pigmented with black and sandy colour. The lower or posterior 

 gills are the same colour as the body. Small specks of sandy colour 

 occur sometimes also on the body, but are conspicuous only in one 

 specimen. Gills comparatively small, apparently bipinnate, but of so 

 close texture that this is not easily made out. Completely contractile, 

 but pocket does not close. Edge of pocket slightly raised and slightly 

 undulating, sometimes with a thin line of sandy pigment round 

 the edge. Ehinophore-pockets ditto. Rhinophores long and deeply 

 perforated . 



"The creatures are very soft indeed; the mantle is ample, with 

 a wavy margin. Foot is fairly broad, grooved and notched in front. 

 Tentacles long, slender and mobile. Under surface uniformly vermilion." 



Mr. Crossland added the following notes on an orange - brown 

 specimen, which he rightly regarded as a variety of this species : — 



" Most probably only a variety of last species. Rather flat, mantle 

 ample, harsh to touch but not particularly stiff. Ground colour a dull 

 light yellow, plentifully besprinkled, especially on the visceral mass, 

 with small blotches made of minute specks of orange-brown. Also 

 dark grey ill-defined dots. Network with pits in meshes over visceral 

 mass, very distinct. Rhinophores large, gills small. Rhinophores 

 perfoliate, all over dark brown and white. The two anterior gills are 

 of the same colour ; the sis posterior orange. They are simply pinnate 

 and quite symmetrically arranged. Edges of rhinophore and gill- 

 pockets slightly raised, darker brown ; gill-pocket with a thin white 

 edging." 



The buccal parts and other internal characters are as in the other 

 specimens. The gills, though straight and scanty, can be seen under 

 the microscope to be bipinnate in places. 



The ten specimens preserved differ somewhat in appearance, some 

 being white and some reddish brown, but agree in anatomical and 

 essential external features. The white specimens are the larger. 



The animals are much bent, but, if straightened out, the largest 

 would be about 50 mm. long and 35 mm. broad. They are very flat, 

 the maximum height being only 8-9 mm. The ample mantle-margin 

 (9-10 mm. wide) overhangs the foot on all sides. The foot is not 

 narrow (about 15 mm. wide), and has expanded margins. The dorsal 



