DALL: MOLLUSCA AND BRACHIOPODA. 419 



This group differs from the typical Vesicomya chiefly by the possession of a 

 distinct angular pallial sinus. The hinge and other characters in essentials are 

 the same, but we may suppose, in the absence of any positive knowledge of the 

 animal, that this indicates longer siphons than in such species as V. stearnsii, 

 where they are known to be complete and papillose, longer than in Isocardia, but 

 still quite short. 



Vesicomya (Callogonia) angiilata Dall. 



Plato 6, figure 12. 



Callogonia angulata Dail, Proc. U. S. Nat. Mas., 1896, 18, p. 19. 



Shell elongate, moderately inflated, the surface as in the other species; the 

 anterior end rounded, shorter ; the posterior end produced, pointed ; ligament 

 short, set in a groove ; the posterior dorsal border marked by two obscure ridges 

 radiating from the beak, the outer one of which terminates at the posterior extreme 

 of the valve, angulating the margin ; the epidermis is denser and lamellose in the 

 interspaces between these ridges ; lunula obscure ; basal margin nearly straiglit, 

 rounded up toward the ends ; beaks low, anterior ; interior white, with some radial 

 striae; hinge narrow; right valve with two low cardinals coalesceut above, and a 

 third, higher, springing between them ; pallial line distinct, with an angular, rather 

 short sinus. Height, 35 ; length, 58 ; semidiameter, 10 mm. ; the vertical of the 

 beaks, 18 mm. behind the posterior end of the shell. 



U. S. S. "Albatross," station 3392, in the Gulf of Panama, in 1270 fathoms, 

 hard bottom, temperature 36°. 4. U. S. N. Mus. 122,933. Also (fragments) at 

 station 3360, in 1672 fathoms, sand, temperature 36°.4 F. 



A single right valve of this distinct species was collected as above, and differs 

 from Vesicomya especially by its angular pallial sinus. 



(Teleodonta) 



Tellinacea. 



Tellinidae. 



TELLIKA (L.) L.oiARCK. 



Arcopagia Leacu. 



PHYLLODINA Dall. 



Tellina (Phyllodina) fluctigera Dall, n. sp. 



Shell solid, elongate-oval e, nearly equilateral, of a yellowish white color; 

 beaks low and flattish ; anterior dorsal slope gentle, straiglit ; anterior cud 



