ELIOT : NUDIBEANCHIATA FROM CAPE VERD ISLANDS. 145 



" Rhinophores very large, deep chocolate colour, perfoliate in whole 

 visible length, completely retractile, though with difficulty. Gills 

 same colour and appearance, very small, not a quarter of the size of 

 the rhinophores, simply pinnate, 3 in number, all placed anteriorly 

 to the anus, on a broad base. The body is a translucent white, the 

 light brown liver aud whitish genitalia showing through. There are 

 a few opaque white spots in the skin, especially at the junction of the 

 mantle and the visceral mass. Two clear black eyes show through 

 some little way behind the rhinophores." 



The larger of the two preserved specimens is 4-5 mm. long, 2"5 mm. 

 broad, and rather flat. Otherwise it is just as described above. The 

 contrast between the dark -brown rhinophores and branchiae and the 

 white body is verj' remarkable. The rhinophores are very large. 

 The three gills are everted, but appear to be completely retractile into 

 a small round pocket. Strictly speaking, only the ramifications of 

 the branchiae are brown, the main rhachis being white. The dorsal 

 surface is minutely granulate. There is a ring of rod-like spicules 

 inside the integuments round the mantle-rim, but in the centre of the 

 back there seem to be no spicules The mantle -margin is fairly wide ; 

 the foot rather narrow, grooved and notched in front. A large blunt 

 prominence on either side of the mouth perhaps represents a tentacle. 

 The large dark rhinophores are visible right through the body, and 

 can be seen from the lower side. 



There is a labial armature composed of minute mace-shaped elements. 

 The radula consists of 71 rows of teeth. The central tooth is a plate 

 bearing four longish denticles on its upper edge, which point 

 backwards. The tirst lateral has a larger base and bears six denticles, 

 of which the third from the inside is the largest. In the succeeding 

 teeth this large denticle increases in size, the denticles to the inside 

 of it disappear, and those to the outside become more numerous. 

 Fig. 7 will show how the plate-like median tooth and the hamate, 

 denticulate, lateral teeth are connected by a complete series of 

 intermediate forms. As in the specimens examined by von Ihering, 

 no armature was found in the genitalia. 



These specimens are probably the young of C. Charts, which is recorded 

 from Naples, and is perhaps itself not full-grown, as it is only 10 mm. 

 long. The most striking characteristic of the species is the contrast 

 between the white skin a ad the dark colour of the rhinophores and 

 branchiae. A similar contrast is found in C. flavomaculata, MacFarland, 

 from the Californian coast, which is white, with pale-yellow spots, 

 and large black or brown rhinophores. 



For a list of species see Cockerell & Eliot, Californian Nudibranchs, 

 Journ. Malac, 1905, vol. xii, p. 34. 



Chkomodoris, a. & H. 

 This genus is very abundant in the tropical Indo-Pacific, and is 

 remarkable for its brilliant coloration and elaborate patterns. It 

 extends as far north as Japan and Puget Sound, and as far south 

 as Tasmania and New Zealand. In European aud Atlantic waters the 

 records are relatively scanty, about ten species being known from the 



