800 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



CUSPIDARIA ROSTRATA (Spengler) Ball. 



(Plate LXXII, fig. 6.) 



Nea-ra rostrata VERRILL, Trans. Conn. Acad., V, p. 562, pi. LVIII, fig. 39, 1882; VI, 

 p. 277, 1884; Expl. Albatross, Report U. S. Com. Fish and Fisheries for 1883, 

 p. 574, 1885. SMITH, E. A., Report Voy. Challenger, Zool. Lamellibranchiata, 

 XII, p. 35, 1885. 



Cuspidaria rostrata BALL, Bull. Mus. Cornp. Zool., XII, p. 294, 1886; XVIII, p. 444, 

 1889 ; Bull. U. S. Nat. Mus., No. 37, p. 66, 1889. LOCARD, Campagnedu Caitdan, 

 Annales do 1'Universite de Lyon, p. 177, 1896. 



This species was obtained at about fifteen stations between 1ST. lat. 

 40 6' 50", W. long. 70 34' 15", and K. lat. 38 31', W. lolig. 73 21', 

 in 65 to 156 fathoms. South to Barbados in 65 to 1,639 fathoms. Ball. 



CUSPIDARIA GLACIALIS (G. O. Sars) Ball. 

 (Plates LXXI, tig. 9; LXXIII, fig. 5; LXXV, ng. 9.) 



Neara glacialis G. O. SARS, Mollusca Reg. Arctic* Norvegue, p. 88, pi. 6, figs. 

 8, a-c, 1878. VERRILL, Trans. Conn. Acad., V, p. 562, pi. XLIV, figs. 10, a-b, 

 1882; VI, p. 277, 1884; Expl. Albatross, Report U. S. Com. Fish and Fisheries 

 for 1883, p. 574, 1885. SMITH, E. A., Report Voy. Challenger, Zool. Lamelli- 

 branchiata, XIII, p. 35, 1885. 



Cuspidaria glacialis DALL, Bull. Mus. Coinp. Zool., XII, pp. 294, 303, 1886; Bull. 

 U. S. Nat. Mu , No. 37, p. 66, 1889. 



Cuspidaria arctica var. glacialis DALL, Bull. Mus. Conip. Zool., XVIII, p. 444, 

 1889; Proc. U. S. Nat. Mus., XII, p. 280, 1889. 



Cuspidaria glacialis BUSH, Bull. Mus. Comp. Zool., XXIII, p. 226, 1893. 



Not Cuspidaria artica (M. SARS). 



This very common species was dredged at many stations from 1ST. lat. 

 44 26'. W. long. 62 10', to N. lat. 37 S', W. long. 74 33', in 62 to 828 

 fathoms. South to the Gulf of Mexico, in 64 to 1,467 fathoms. Ball. 







CUSPIBARIA MEBIA, new species. 

 (Plates LXXI, figs. 5, 6; LXXIII, fig. 6.) 



Shell of moderate size, resembling a medium-sized C. glacialis (Sars), 

 in form, but decidedly more swollen, with the rostrum narrower and 

 more distinctly defined by a stronger ventral emarginatiou. Umbos 

 large, prominent, and swollen, with strongly incurved and very promi- 

 nent beaks. The antero-dorsal margin is a little convex and slopes 

 rapidly to the evenly rounded anterior end; the ventral margin is regu- 

 larly curved and is rather more convex than in C. glacialis, and shows 

 a very decided emarginatiou at the base of the rostrum; the postero- 

 dorsal margin is nearly straight but slopes from the beak to the end of 

 the rostrum which is of moderate length and tapers from the base to 

 the narrow, subtruncated end; it has no distinct diagonal ridge, but is 

 separated from the body of the shell by a strongly marked depression. 

 The surface is nearly smooth but is covered with fine lines of growth 



