1902.] 



NUDIBRANCHS FROM ZANZIBAR. 



65 



markings. Round the edges of the lobes, the angles of the body, 

 tlie ridge of the tail, the cups of the rhinophores, and the frontal 

 veil runs a brown line. The surface of the body is covered with 

 microscopic brown specks, which here and there are aggi'egated 

 into spots just visible to the naked eye. There are also a few 

 other spots. 



There aie no anterior tentacles, but a small frontal velum. 

 The i-hinophoi'es are perfoliate and set in little open cups on the 

 top of fairly long piUais, which are usually held nearly horizontally 

 and liave not any process behind as in Scyllcea (see PI. Y. fig. 5). 

 The back and inside of the wings are covered with colourless, 

 transparent contractile branchiae similar to those of Scyllcea 

 (text-fig. 3, p. 66). On the tail is a slight ridge, not amounting 

 to a crest. The foot is veiy narrow. 



Text-fig. 2. 



Digestive organs of Crosslandia viridis. 

 <£., oesophagus. | gl., gland. | st-jyl., stomacli-plates. 



The body-cavity is spacious anteriorly until the commence- 

 ment of the liver. After this point it is quite narrow, owing to 

 the thickness of the soft transparent body- walk The jaws (PL Y. 

 figs. 7, 8) are large and hinged dorsally. The masticatory edge 

 is smooth and flexible, of a deep brown colour and bent outwards, 

 the muscles being attached at the bend and covering the large 

 stifi" cheeks. The radula (PI. Y. figs. 4, 6) is short ; each row con- 

 sists of a median tooth and about 30 laterals on each side. The 

 median tooth has a fairly large spine in the centre of the anterior 

 margin and about 5 denticulations on each side, of which the 

 pair nearest the centre are considerably larger than the others. 

 The lateral teeth are also denticulate, but vary somewhat in form, 

 and the corresponding teeth in the different rows do not always 



Proc. Zool. Soc— 1902, Yol. II. I^o. Y. 5 



