342 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Leda tenuisulcata (Conth.) Stirapsou. 



Station 973, in 17 fathoms, off south side of Cape Cod. Off Chesa- 

 peake Bay, station 898, in 300 fathoms. 



Leda pernula (Miiller). 



Station 1025, in 216 fathoms. Off Halifax, 59 fathoms. 



Nucula tenuis (Mout.) Turton. 



Stations 895, 943, 997 to 999, in 153 to 335 fathoms. 



Modiolaria nigra (Gray) Lov<Sn. 



Station 921, in 65 fathoms, 73 miles south of Martha's Vineyard; also 

 at stations 985, 980, 991, 993, off" Martha's Vineyard, in 26 to 39 fathoms. 

 Off Chesapeake Bay, station 900, in 31 fathoms. 



Modiolaria corrugata (Stimpson) Morch. 



Station 918, in 45 fathoms, 61 miles south of Martha's Vineyard. 



Modiolaria poUta Veriill and Smith. 



Modiola polita Vemll and Smith, in Verrill, Amer. Journ. Sci., xx, pp. 392, 

 400. Nov., 1880 ; Verrill, Proc. U. S.Nat. Mus., iii, p. 402, Jan., 1881 ; Trans. 

 Conn. Acad., v, p. 578, July, 1882. 



Dall, Bulletin Mus. Comp. Zool., ix, p. IIC, 1881. 

 Myiilus luteus Jeffreys, French Expl. in Bay of Biscay, in Rept. Brit. Assoc, 

 1880 (no description); Ann. and Mag. Nat. Hist., Oct., 1880, p. 315 (no 

 description). 

 Modiola luiea Fischer, Jour, de Conchyl., iii, vol. xxii, p. 52, Jan., 1882. 



Two living specimens were taken at station 895, in 238 fathoms. Gulf 

 of Mexico, 339 fathoms, "Blake" Exp. (t. Dall). Mr. Dall has com- 

 ])ared his specimens with our original types. Bay of of Biscay, 677 to 

 900"^,— Jeffreys, Fischer. 



Mr. Dall has suggested that this species belongs to Modiolaria., rather 

 than to Modiola. In this opinion I am disposed to concur. ]t forms 

 a large nest of byssus-fibers and mud. The largest examples show 

 tine radiating lines. 



Idas argenteus Jeff., var. ?lamellosus Verrill. 



Trans. Conn. Acad., a'. p. 579, July, 1882. 

 Idas argenteus Jeftreys, Annals and Mag. Nat. Hist., Nov., 1870, p. 428; Proc. 

 Zool. Soc. London, 1879, p. 570, pi. 45, fig. 3. 

 This shell is thin, translucent, covered with a yellowish epidermis; 

 umbos and hinge reddish brown; inner surface iridescent; sculpture, 

 distinctly raised thin concentric lamella^, which are not crowded; no 

 radiating lines. Some of the specimens have several horny, sharp, stiff", 

 beard-like processes projecting from the posterior and dorsal surfaces. 

 One of the largest specimens is 5.5""" long; greatest height, 2.2'"^". 

 Station 997, in 335 fathoms; several living specimens. 



Pecicn glyptus Verrill. 



Trans. Conn. Acad., v, p. 580, July, 1882 (description). 

 Pecten, sp., near opercularis Verrill, Proc. Nat. Mus., iii, p. 403, 1881. 



