518 
A. E. T Terrill — Catalogue of Marine Mollusca. 
it in 1859, 1861, 1863, 1864, 1868, 1870, and 1872. It was dredged 
in 1879 by our party, on the U. S. Fish Commission steamer “Speed- 
well,” oft’ Cape Cod, in 34 fathoms. North Greenland, — Bergh. 
Marsenina prodita (Xov.) Bergh. 
Lamellaria prodita Loven, 1846. 
Marsenina prodita Bergh, Y.id. Meddel. Naturli. For., Kjobeuhavu, 1857, p. 112, pi. 1> 
figs. 1-6, 8-24, (anatomy, etc.) 
G. 0. Sars. Moll. Reg. Arct. Norvegise, p. 151, pi. 12, figs. 5 a-c ; pi. v, figs. 7 a, 
b (dentition). 
Terrill, Proc. U. S. Nat. Mus., iii, p. 373, 1860. 
Plate XXII, figures 2, 2 a. 
This species was taken living, at Eastport, Me., by Prof. S. I. 
Smith and myself, in 1864 and 1868. This is easily recognized by 
its comparatively prominent, acute spire, turned to one side, by its 
obliquely elougated aperture, and by the margin of the outer lip 
being slightly indexed near the suture. 
Marsenina ampla Terrill. 
Marsenina ampla Terrill, Proc. U. S. Nat. Mus., iii, p. 374, 1880 (description). 
Plate XLII, figures 3, 3 a. 
Eastport, Me. Dredged in 1868, by the writer. 
Lamellaria pellucida Terrill. 
Lamellaria pellucida Terrill, Amer. Journ. Sci., xx, pp. 391, 395, Nov., 1S80 
(description); Proc. U. S. Nat. Mus., iii. p. 372, 1880, (description). 
. Plate LTIII, figures 4, 5, 5 a. 
U. S. Fish Commission, stations S70 to 872, south of Martha’s 
Vineyard, in 86 to 155 fathoms, fine sand (16 specimens, living), 
1880; stations 940, 949, 1032, 1038, in 100 to 2,08 fathoms, 1881. 
Off Delaware Bay, 130 to 156 fathoms. 
Lamellaria pellucida, var. Gouldii Terrill, nov. 
Plate LTIII, figure 3. 
Closely related to L. pellucida V., of the same region. It differs 
in having the mantle shorter, broader, and higher, of a softer and 
thicker substance, with more or less numerous, low verrucae on the 
dorsal surface; color pale yellow or yellowish white, more or less 
blotched or specked with brown, flake-white and yellow. The verge 
is different in form, the lateral papilla beings larger and longer, and 
not so near the end, the portion beyond it forming a spatulate or 
obovate lobe, round at the end. The shell is very thin, delicate and 
