522 
A. E. TerriU- — Catalogue of Marine Mollusca. 
Cerithiella Whiteavesii Terrill. 
Cerithiopsis costulatus Whiteaves (non M (tiler). 
Lovendla Whiteavesii T errill, Amer. Journ. Sci., xx, pp. 391, 396, Nov. 1880; Proc. 
U. S. Nat. Mus., iii, p. 375, 1880. 
Plate XLH, figure 7. 
The generic name, Lovendla G. O. Sars, having been preoccupied 
in Hydroida, I propose to use Cerithiella for the same group, with 
C. rnetula (Low) as the type-species. The dentition is peculiar. 
Oft' Martha’s Vineyard, stations 391, 892, and 894, in 365 to 500 
fathoms, 1880 ; 947, 994, 997, 999, in 266 to 368 fathoms, 1881,— U. 
S. Fish Com. Gulf of Saint Lawrence! 200 fathoms, (coll. Whit- 
eaves.) 
Lacuna glacialis Muller. 
Lacuna glacialis Moller, Kroyer’s Tidsskr., i v, p. 82, 1842. 
Plate XLII, figure 6. 
Gulf of St. Lawrence! (coll. J. F. Whiteaves). Greenland, — Muller. 
Fossarus elegans Terrill and Smith, sp. nov. 
Plate LTI1, figure 28. 
Shell small, ovate, with a short, acute, turreted spire, and five 
angulated and sharply carinated whorls, elegantly latticed between 
the carina?. The whorls increase rapidly, the last being relatively 
large. On the last whorl there is a sharp angular carina at the 
shoulder, often with a smaller one just below it ; a larger and more 
prominent one around the periphery ; and three or four smaller ones 
on the anterior slope, besides a spiral fold around the umbilical 
region ; on the larger specimens there are sometimes two or three 
strong, raised varices on the last whorl, and the edge of the lip 
is thickened. The intervals between the carinse are concave. On 
the preceding whorls the two larger carina? are visible, often with a 
small intermediate oue. The nucleus is minute, regular, smooth, a 
little prominent. The rest of the shell is covered, between the car- 
ina?, with numerous close* thin, oblique, raised lamellae, or lines of 
growth ; those on the subsutural band are flexuous. Aperture 
nearly round; lip continuous; outer lip thickened, and with denti- 
cles externally, where the carina? terminate. Umbilicus spiral, very 
narrow, sometimes closed. Color white. 
Length, 5 - 3 miu ; breadth, 4 mm ; length of aperture, 2 mm . 
Ofif Martha’s Vineyard, station 949, 100 fathoms, 1881, — L T . S. Fish 
Com. Eight specimens, none living. 
