464 K. J. Bush — Mollnsca of Gape Hntteras 



Skenea trilix, sp. nov. 



Bush, Report U. S. Com. Fish and Fisheries, p. 82, for 1883, 1885. 

 Plate XLV, figures 7, la. 



Shell small, disk-shaped, with the spire nearly flat, but with the 

 nuclear whorls rising a little above the level of the last whorl. 

 Whorls four or more, the body-whorl strongly tricarinate, one carina 

 at the periphery, one around the base and one around the shoulder, 

 the spaces between them equal, convex and nearly smooth. The 

 upper carina shows on all except the nuclear whorls and the one next 

 following ; above this carina the whorl is flattened or slightly con- 

 cave, joining the preceding whorl nearly at right angles, but swelling 

 a little close to the suture; on this band four or five faint spiral stria? 

 sometimes occur; more rarely traces of them are found below the 

 carina and on the base. On the basal side, the last whorl is pretty 

 regularly rounded and strongly convex and the umbilical depression 

 is large and deep, funnel-shaped, extending to the apex. Within this, 

 the whorls are distinctly spirally grooved and sometimes its border 

 is defined by a small, distinctly raised carina. Aperture nearly cir- 

 cular though slightly angulated at the caringe. Lip a little thickened, 

 slightly expanded next the body-whorl ; inner lip represented only 

 by a thin, closely adherent layer of enamel. Nucleus small, a little 

 prominent, smooth, glossy and subvitreous, the apical whorl minute 

 and slightly turned up. Surface of the shell lustrous and usually 

 nearly smooth though often showing faint, flexuous lines of growth. 



Dry specimens are more or less opaque, yellowish white. 



Fresh specimens, preserved in alcohol, are very thin, nearly trans- 

 parent, the animal matter showing distinctly beneath. The entire 

 surface of these is crossed by numerous, very delicate, regular, equally 

 distant, microscopic lines in the direction of the lines of growth. 



Operculum very thin, horny, light yellow, round, of about five 

 equal whorls, nucleus at the center. 



Animal with short, stout tentacles; prominent eyes situated at 

 their bases ; and a rather broad, bilobed snout. 



Breadth, :!""" ; height, l""". 



Very abundant, both alive and dead, in 7 to 17 fathoms. 



Skenea lirata v. 



Oiiudaxis (^) lirata Verrill, these Transactions, vol. v, p. 529, 1882; vol. vi, p. 452, 

 1885. 



Several specimens were found in 10 (o 17 fatlionis, 



