ELIOT— NUDIBEANCHS. 437 



would be about 30 mm. long. The maximum breadth is 1T5 mm. and the height 7 mm. 

 The shape is very flat. The general colour is a yellowish grey. 



The back is studded with about 130 stalked processes, s^jhcrical or ovoid in shape. 

 The stalks are small ; at most they arc 1 mm. in length, but many are much shorter. 

 The largest processes measure about 7x5 mm. ; the smaller have a diameter of about 

 one millimetre or less. The large ones are found only in the middle of the back. The 

 little ones are set along the dorsal margin and are also found among the big ones. The 

 upper half of each process is spotted with purplish l)rown : this colour is much more 

 intense in the little ones, where it is nearly black, than in the larger ones, where it is 

 only pale grey. The processes do not contain any diverticula or core of any kind and in 

 section they show a uniform jelly-like texture. Under a microscope the coloured spots 

 are seen to be minute, low tubercles. 



The rhinophores are large, yellow, and laminated ; they are completely retracted and 

 the sheaths, which are closed, appear as inconspicuous mounds. The anal papilla is also 

 inconspicuous ; it is set very far back. The mantle-margin is ample (as much as 5 mm. 

 wide), thin, undulated, and soft. The margin of the foot is also expanded. When the 

 animal is divested of its papillse it looks more like a Doridojysis than a Fhyllidia. The 

 underside of the mantle bears some faint purplish spots and a row of not very well- 

 developed yellow lamellae ; they are set close together and each is about 3 mm. long. 

 The integuments are full of spicules of very various shapes and sizes. 



The intestines are much hardened and only the following points could be ascertained. 

 The anterior part of the alimentary canal is apparently arranged as in Dorldopsis. 

 There is no trace of a glandular mass as in Fhyllidia. The oesophagus makes a bend 

 near the central nervous system, which is much concentrated, the ganglia being fused 

 into a continuous mass. The liver is greenish brown and not divided behind. The 

 hermaphrodite gland is white and very large, forming a layer over the liver nearly 5 mm. 

 thick. The green spermatotheca and black spermatocyst are visible. The genitalia 

 appear to have been much developed and to have squeezed the oesophagus and other 

 organs against the dorsal integuments. The condition probably indicates the period 

 immediately before eggs are laid. 



This specimen belongs to the genus CeratophylUdia, but is, I think, specifically 

 distinct from G. africmia, previously described by me. Superficially the appearance of 

 the two species is quite different — C. africana being yellow with black globules on the 

 back, distant about 2 mm. from one another and allowing the ground-colour to be clearly 

 seen ; while C. grisea is grey of various shades and the globules touch one another, com- 

 pletely hiding the ground-colour, as will be seen from the drawing. In C. grisea 

 (30 mm. long) the larger globules have a diameter of 7 mm. ; in G. africana (about 

 22 mm. long) the largest do not exceed 2 mm. in diameter, but the stalks are longer. 

 Otherwise the differences are small, and of course it is possible that the use of different 

 preserving fluids may have caused the globules to contract in one specimen or swell in 

 the other; but provisionally I think it safer to register the two forms separately. 



58^ 



