178 DR. BAIED ON THE APHEODITACEAN ANNELIDES. 



species (to be here described), which evidently belongs to this 

 genus, the back is also covered with a coat composed of matted 

 hairs. This character must therefore be modified as I have given 

 it in the diagnosis. 



Savigny, in his System of Annelides, placed the species upon 

 which the genus was founded in a tribe, which he designates 

 Salithece Hermionce. De Blainville was the first who formed the 

 genus, and called it, in accordance with the indication of Savigny, 

 Hermione. 



Sp. 1. Heemioke htsteix. 



Halithea hystrix, Savigny, Syst. Annelid, p. 20. 



In general the elytra of this species are quite or nearly exposed ; 

 but, in all the specimens I have examined, the feet are more or 

 less covered with sordes, apparently the remains of a felty coat 

 which most probably clothed the whole back ; and, as I have men- 

 tioned above, we have one specimen from the Canaries, the whole 

 back of which is covered with the same material. The H. hystrix 

 is a native of the seas of Europe, and occurs pretty commonly on 

 our own coasts. (Mus. Brit.) 



Sp. 2. Heemione htsteicella, Quatrefages ; Cuv. Begn. An., edit. 



Grocli., Annelides, t. 19. f. 1. lor-f. ; Kinherg, I. c. p. 382. 



A figure only of this fine species is given by Milne-Edwards in 

 the work just quoted, and he refers for a description to an un- 

 published work upon the Annelides by M. Quatrefages ; but 

 Kinberg, who appears to have seen the species, gives a description 

 of it in his paper in the Swedish Transactions, and a figure in 

 the ' Eregatt. Eugen. Eesa.' It is nearly allied to the preceding, 

 but excels it in colours. According to Kinberg, it inhabits the 

 Mediterranean on the coast of Syria. 



Sp. 3. Heemione chetsocoma, sp. nov. 



Body elongate-ovate, of about 12 or 13 lines long, and at the 

 broadest part about 5 lines in diameter. The back is covered 

 with a thin skin, composed, as in other species, of a fine matted 

 felt of delicate brown hairs. Head small ; eyes peduncled ; ten- 

 tacle small; palpi short, setaceous, brownish-coloured. Scales 

 thin, overlapping each other on the dorsal surface. The feet 

 appear to be 32 pairs ; but those at each extremity are so small 

 that it is difficult to count them satisfactorily. They are, as usual, 

 biramous and furnished with two kinds of bristles. Those on 

 the dorsal branch are rather long, and of a golden-brown colour. 

 They are all of similar form, are curved, and somewhat flattened 



