BALL: MOLLUSCA AND BRACHIOPODA. 399 



bear a superficial similarity, and recently M. Cossmaun has expressed the same 

 opinion. There is a pretty gradual shading off from the Eocene type to that of 

 the recent species, but the inequilateral shell, the V-shaped ligament, and the 

 general aspect forbid us to refer these little species to the typical Barbatia, and 

 it will therefore be convenient to retain Conrad's name. 



Area (Cucullaria) endemica Dall, n. sp. 



Plate 17, figure 8. 



Shell small, thin, brownish, inequilateral, equivalve, moderately inflated ; beaks 

 small, pointed, slightly prosogyrate, situated at about the anterior third, separated 

 by a long, narrow, flat, lozenge-shaped area on which the ligament, which is wholly 

 opisthodetic, forms a long, very acute V; surface dull, minutely concentrically 

 imbricate, radiately sculptured with numerous close, very fine rounded threads which 

 become wider and flatter distally ; periostracum fil)rous, dehiscent ; anterior end 

 attenuated, short, pointed ; posterior end broad, rounded, compressed ; a shallow 

 radial constriction extending basally from the beaks ; base oblique, with a narrow 

 gape for the byssus at the extremity of the constriction; interior porcellanous, white, 

 tlie scars evident; hinge rectilinear, anterior teeth six, vertical, separated by a gap 

 from the narrow oblique series of eight posterior teeth ; margin forming an angle 

 at each end of the hiuge plate. Lon. of shell, 11.5 ; of beaks behind the anterior 

 end, 3.0 ; max alt., 7.0 ; diam., 4.5 mm. 



U. S. S. "Albatross," station 4721, Pacific Ocean, in S. Lat. 8° 07' and 

 W. Lou. 104° 10', in 2084 fathoms, globigerina ooze, bottom temperature about 

 35° F. U. S. N. Mus. 110,578. Also at station 4685, in S. Lat. 21° 36' 

 and W. Lou. 94° 56', in 2205 fathoms, radiolariau ooze, bottom temperature 

 35°.3 F. 



This is very close to Jrca (Cucullaria) pferocsxa E. A. Smith, of the Mid 

 North Pacific, but has a coarser radial sculpture and less numerous teeth. 



GLTCTMERINAE. 



GLYCYItlEKIS Da Costa. 



Glycijmeris Da Costa, Urit. Conch., 1778, p. 170 ; type, Area glyci/meris Lione'. 

 Pectunculus Lamarck, Prodrome, 1799, p. 87 ; not of Da Costa «'/ al. 

 Pseudaxinea Monterosato, Nota int. Pectunculus dei mari d'Europa, 1892; type, 

 P. violascens Lamarck. 



Glycymeris multicostatus Sowehbt. 



Pectunculus multicostatus Sowerby, P. Z. S. Lend., 1832, p. 105; Reeve, Conch. Icon , 

 1, Pectunculus, pi. 5, fig. 26. 



Bay of Guayaquil, Cuming. U. S. S. "Albatross," station 3368, near Cocos 

 Island, in 6G fathoms, rocky bottom, temperature 58°. 4 F. U. S. N. Mus. 

 122,877. 



The single vulve obtained as above has all the aspect of the specimens of G. 



