310 REPORT ON ALBATROSS MOLLUSCA DALL. 



Olivella jaspidea Gmelin. 



Collected at Stations 2704, 2765, and 276G, the southernmost being off 

 the Rio de la Plata and the depths 10 to 12 fathoms. 



Olivella bullula Reeve. 



Collected at Stations 2754, 2756, and 2768, the southernmost being 

 off Cape Delgado, eastern Patagonia, and the depths varying from 43 

 to 880 fathoms. The specimen from shallow water was dead. 



Genus ANCILLARIA Lamarck. 



Ancillaria Tankervillei Swainson. 



Young and dead specimens of this species were collected at Stations 

 2762 and 2764, in 11£ to 52 fathoms, off the coast of Brazil aud the Rio 

 de la Plata. 



Family MARGINELLID^E. 



Genus MARGINELLA Lamarck. 



Marginella cineracea Dall. 



Plate xi, Fig. 6. 



M. cineracea Dall, Bull. U. S. Nat. Mus., No. 37, p. 106, No. 298, PI. 42, Fig. 6, 1889. 



Shell thin, opaque, ashy (when living perhaps translucent whitish), 

 oval, smooth, four whorled; spire low, dome-like, not glazed over with 

 callus; suture distinct, not chauneled, slightly appressed: surface 

 smooth, marked only by faint incremental lines; body whorl at the ap- 

 erture thinly glazed but not callous; plaits oblique, distinct, three in 

 number, the posterior weakest, the anterior continuous with the outer 

 lip as it curves around the canal; siphonal fasciole, none; outer lip thin, 

 very slightly reflected at its outer edge and scarcely thickened within, 

 not deuticulate; the outer margin of the lip is arched forward and out- 

 ward; aperture wide, with a shallow anterior sious and a narrow pos- 

 terior commissure; maximum longitude of shell 14; maximum latitude 

 8 mm . 



Hab. — TJ. S. Fish Commission Station 2678, in 731 fathoms, ooze, off 

 Cape Fear, North Carolina; bottom temperature 38°.7 F. 



This is a remarkably thin, simple, yet elegantly formed species. It 

 is notable, among other things, for having but three plaits, for its 

 absence of callus, and for its perfectly smooth outer lip. I do not re- 

 call any species of its own size with which it should be compared. 

 There is a much smaller and probably unnamed species, dredged in 

 deep water in the latitude of Fernandiua, Florida, which has a very 

 similar form. The thinness of the shell recalls 31. fauna Sowerby and 

 Volvarina pallida. 



