162 BRITISH 1TNICATA. 



whose anatomical details are admirable, has failed to 

 give a good general representation of the animal, from 

 having had access only to spirit specimens. His 

 generic and specific names are in consequence some- 

 what of misnomers, as the flattening of the surface, 

 from the individuals fall in o- from the centre in dying- 



o tj o ? 



gives more of a circular arrangement than really exists 

 in nature. The change of colour has already been 

 remarked upon. 



The question arises, therefore, whether the Diazomi 

 violacea and Syntethys hebriclicus are not one and the 

 same animal. The only reason which induces us to 

 keep them distinct is the peculiar [stout and obtuse] 

 papillas of the branchial sac (PI. XLIX, fig. 6), so very 

 different from the slender pointed ones represented by 

 Savigny, and in which this careful observer could 

 scarcely have been mistaken. Professor Groodsir has 

 kindly supplied us with a portion of a specimen from 

 the original habitat, and I believe now coincides in the 

 view of its generic relation here taken. I am also 

 indebted for specimens to Mr. McAndrew. 



Its vitreous transparency, and the opaque white 

 lines of the thorax, give this remarkable species very 

 much the appearance of a huge group of Clavelinas 

 cemented together at the base. 



