PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 397 



front of them, so as to rise nearly to a level with tlie umbos ; internally, 

 opposite the tips of the beaks, there is a smooth swelling within the 

 marjiin. Hinge margin thin, toothless, bnt with an internal sear behind 

 the beaks, where the ligament and ossicle were attached (the ligament 

 is gone). Palial sinns 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. 

 ahyssicola. 



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 exi^anded anteriorly and much more so jjosteriorly, being far more 

 inequilateral and more elongated. 



Kennerlia glacialis (Leach) Carpenter. 



randora glaciulia Leacli, liosso's Voyage, appendix, j). 174. — Leclie, Kougl. 

 Veteusk.-Akad. HamlL, Band 16,. p. 11, pi. 1, figs. 1 a, h, 1878 (author's 

 copy). 



Living specimens of this arctic shell were dredged at station 873, in 

 100 fathoms. It had in-eviously been recorded from the Gulf of Saint 

 Lawrence by Whiteaves, but was not known to occur on the New 

 England coast. It differs widely from the common Clkliophora triUneata 

 Cpr. {= Pandora triUneata 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. 



Neaera glacialis. 



G. O. Sars, op. cit., p. 88, pi. 6, figa. 8 a-c. — Verrill, Trans. Conn. Acad., v., pi. 

 44, fig. 10 h. 



A form of Newra^ 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 Fuudy, 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 05 to 500 fathoms. The larger specimens exceed 

 au 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 difl'erences in the breadth and length of the 

 rostrum. Therefore, it seems to me probable that this shell should be 

 considered merely a variation of iV. arctica. The latter, in its typical 

 form, occurs in the same localities and in about the same numbers, and 



