PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 397 
front of them, so as to rise nearly to a level with the umbos; internally, 
opposite the tips of the beaks, there is a smooth swelling within the 
margin. Hinge margin thin, toothless, but with an internal scar behind 
the beaks, where the ligament and ossicle were attached (the ligament 
is gone). Palial sinus very small, angular. Shell less thin than in the 
- preceding species. Sculpture numerous, very delicate, slightly raised 
lines, which radiate from the beaks over the whole surface; they are 
separated by much wider interspaces, which are smooth and iridescent, 
and not at all excavated. Length, 4.5"; height (beak to ventral mar- 
gin), 4"™. 
One perfect specimen, station 892, 487 fathoms, associated with L. 
abyssicola. 
From the latter it differs widely in shape, having nothing of the rect- 
angular form so characteristic of that species; the latter is also much 
less expanded anteriorly and much more so posteriorly, being far more 
inequilateral and more elongated. 
Kennerlia glacialis (Leach) Carpenter. 
Pandora glacialis Leach, Rosse’s Voyage, appendix, p. 174.—Leche, Kongl. 
Vetensk.-Akad. Handl., Band 16, p. 11, pl. 1, figs. 1 a, b, 1878 (author’s 
copy). 
Living specimens of this arctic shell were dredged at station 873, in 
100 fathoms. It had previously been recorded from the Gulf of Saint 
Lawrence by Whiteaves, but was not known to oceur on the New 
England coast. It differs widely from the common Clidiophora trilineata 
Cpr. (= Pandora trilineata Say), in the absence of the internal radiating 
ridges, in its more inequilateral and irregular form, and in the greater 
convexity of the upper valve. The lower valve is very flat, or even con- 
cave, and is marked externally with several distinct radiating lines. 
Neera gilacialis. 
G. O. Sars, op. cit., p. 88, pl. 6, figs. 8 a-c.—Verrill, Trans. Conn. Acad., v., pl. 
44, fig. 10 dD. 
A form of Nera, agreeing perfectly with this, is common on muddy 
bottoms, in 50 to 192 fathoms, off the coasts of New England and Nova 
Scotia. We have dredged it off Cape Cod, off Cape Ann, off Casco Bay, 
in the Bay of Fundy, and in numerous localities in the Gulf of Maine 
and off Nova Scotia, since 1872; and recently, south of Newport and 
Martha’s Vineyard, in 65 to 500 fathoms. The larger specimens exceed 
an inch in length. 
Among our numerous examples there is, however, considerable varia- 
tion, both in the form of the shell and in the size and shape of the car- 
tilage-pit and lateral teeth. Moreover, the variations in the hinge are 
not correlated with the differences in the breadth and length of the 
rostrum. Therefore, it seems to me probable that this shell should be 
considered merely a variation of N. arctica. The latter, in its typical 
form, occurs in the same localities and in about the same numbers, and 
