518 A, FE. Verrill— 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. 8. Fish Commission steamer ‘“ Speed- 
well,” off Cape Cod, in 34 fathoms. North Greenland,—Bergh. 
Marsenina prodita (Lov.) Bergh. 
Lamellaria prodita Lovén, 1846. 
Marsenina prodita Bergh, Vid. Meddel. Naturh. For., Kjébenhavn, 1857, p. 112, pl. 1s 
figs. 1-6, 8-24, (anatomy, etc.) 
G. O. Sars, MOll. Reg. Arct. Norvegiv, p. 151, pl. 12, figs. 5 a-c; pl. v, figs. 7 a, 
b (dentition). 
Verrill, Proc. U. S. Nat. Mus., iii, p. 373, 1880. 
PLATE XLII, FIGURES 2, 2a. 
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 elongated aperture, and by the margin of the outer lip 
being slightly inflexed near the suture. 
Marsenina ampla Verrill. 
Marsenina ampla Verrill, Proc. U. S. Nat. Mus., ili, p. 374, 1880 (description). 
PLATE XLII, FIGURES 3, 3 a. 
Eastport, Me. Dredged in 1868, by the writer. 
Lamellaria pellucida Verrill. 
Laméllaria pellucida Verrill, Amer. Journ. Sci., xx, pp. 391, 395, Nov., 1880 
(description); Proc. U. S. Nat. Mus., iii, p. 372, 1880, (description). 
PLATE LVIII, FiaureEs 4, 5, 5a. 
U. S. Fish Commission, stations 870 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 208 fathoms, 1881. 
Off Delaware Bay, 130 to 156 fathoms. 
Lamellaria pellucida, var. Gouldii Verrill, nov. 
PLATE LVIII, 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 verruce 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 being 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 
