290 



GASTEROPODA. 



drawing 



tliem at frequent intervals. In some thev 

 present the appearance of flowers, as in Doris 

 (Fig. 231) ; in others they are arborescent, or tree- 



FlG. 231. — HORXE]) DOKIS. 



like, or feathered like an ostrich-plume ; and in some 

 they are disposed in rows, on the sides of the body. 

 The greater number of these sea-slugs are carnivorous, 

 and appear to be very voracious. They feed chiefly 

 upon zoophytes and sponges, some adding to their 

 bill of fare the gelatinous Medusae, that are found 

 floating near them, while occasionally they have 

 been seen devouring other Nudibranchs. 



The spawn of the Nudibranchiate Gasteropod is 

 deposited in the shape of a gelatinous band, always 



IWoc 



Fig. 232 



-tr;toma hombergi. 



arranged in a more or less spiral form, and fastened 

 by one of its edges to Corallines or the under surface 

 of a stone. The eggs are minute and very numerous. 



