358 REPORT ON ALBATROSS MOLLUSC A DALL. 



This is one of those intermediate forms wbieh bridge over the gaps 

 between subgenera. It has exactly the sculpture of some varieties of 

 Cranopsis astariana, but its apex is smaller and more close-set, the form 

 of the shell different, the perforation nearer tlie apex of the shell, and 

 the shell itself is solid and strong, while the C. asturianais delicate and 

 thin. It is difficult to say whether the present species should be called 

 a Puncturella (s. s.), a Cranopsis or a Rimula. 



Subgenus CRANOPSIS Adams. 

 Cranopsis asturiana Fischer. 



Collected at Station 2666, in 270 fathoms, sand, off Fernandina, Flor- 

 ida; and at Station 2750, in 496 fathoms, off St. Bartholomew, West 

 Indies ; temperature 48°.3 and 44°.4 F. 



Genus EMARGINTJLA Lamarck. 



Emarginula tumida Sowerby. 



Collected at Station 2758, 90 miles southeast from Cape San Roque, 

 Brazil, in 20 fathoms. 



Subgenus SUBEMARGINULA Blainville. 



Subemarginula octoradiata Gmelin. 



Collected at Port Castries, Santa Lucia, West Indies, and at the 

 Abrolhos Islands, near Porto Allegre, North Brazil. 



Genus FISSURELLA Bruguiere. 

 Fissurella altemata Say. 

 Not rare at the Abrolhos Islands, Brazil. 



Subgenus GLYPHIS Carpenter. 

 Glyphis barbadensis Gmelin. 



Genus FISSURELLIDEA Orbigny. 



Fissurellidea limatula Reeve. 



Collected at Station 2765, in lOJfathoms, sand, off the Rio de la Plata, 

 from whence it ranges northward to the coast of North Carolina. 



