CHAP. I.] BERMUDAS TO MADEIRA. 13 



The rostral latera are long transverse plates lying beneath 

 the basal margins of the scuta. The carinal latera are large 

 and triangular, with the apex curved forward very much like 

 the upper latera, and the infra-median latera are very small, 

 but in form and direction of growth nearly the same. 



The peduncle is round in section and strong, and covered 

 with a felting of light-brown hair. The scales of the peduncle 

 are imbricated and remarkably large, somewhat as in ,6^. orna- 

 tum, Darwin. About three, or at most four, scales pass entire- 

 ly round the peduncle. The base of attachment is very small, 

 the lower part of the peduncle contracting rapidly. Some of 

 the specimens taken were attached to the lumps of clay and 

 manganese concretions, but rather feebly, and several of them 

 were free, and showed no appearance of having been attached. 

 There is no doubt, however, that they had all been more or less 

 securely fixed, and had been pulled from their places of attach- 

 ment by the trawl. On one lump of clay there were one ma- 

 ture specimen and two or three young ones, some of these only 

 lately attached. The detailed anatomy of this species Avili be 

 given hereafter, but the structure of the soft parts is much the 

 same as in Scalpellum rndgare. 



In two specimens dissected there w^as no trace of a testis or 

 of an intromittent organ, while the ovaries were well devel- 

 oped. I conclude, therefore, that the large attached examples 

 are females, corresponding, in this respect, with the species oth- 

 erwise also most nearl}^ allied, ISi. ornatum. 



In almost all the specimens which were procured by us, sev- 

 eral males, in number varying from five to nine, were attached 

 within the occludent margins of the scuta, not imbedded in the 

 chitinous border of the valve, or even in any way in contact 

 with the shell, but in a fold of the body-sac quite free from 

 the valve. They were ranged in rows, sometimes stretching — 

 as in one case where there were seven males on one side — along 

 the whole of the middle two-thirds of the edge of the tergum. 



