144 



distinct or well defined in the upper half of the shell, and disappears 

 entirely in the lower. Beaks very small, not much elevated, pointing 

 backwards and placed a little behind the middle. Dorsal margin sloping 

 in both directions from the beaks; the posterior slope descending 

 obliquely and rather rapidly ; the anterior straighter and more nearly 

 horizontal. Ventral border nearly straight for the greater part of the 

 length, but rounding upwards at the anterior end. Hinge teeth and 

 muscular impressions unknown. 



Surface marked by exceedingly fine and delicate concentric strise, or 

 crowded lines of growth. 



Length, about three lines and a half ; height, not quite two lines. 



Vesuvius Bay, Salt Spring or Admiralty Island, in Division A; J. 

 Richardson, 1875, A detached left valve. 



This fragile and glassy little shell appears to be undescribed, but as the 

 only specimen collected is an imperfect valve, probably of an immature 

 individual, it is not thought desirable to give it a new specific name. 

 It is rather closely allied to T. (CEne) suhscitula. Meek,* but is more 

 narrowly elongated, has smaller and less elevated beaks, a much 

 straighter ventral margin, and no trace of any flexure on the posterior 

 side. In the general outline of its valves it seems to approach rather 

 nearly to (Enona papyria of Conrad, f but the latter shell is described as 

 "convex," and its ventral margin is said to be "regularly curved." 

 Moreover, one of the characters of the subgenus (Enona is its very 

 narrow, lanceolate lunule, marked by a deeply impressed line, while no 

 indications of any definitely mai-gined lunule can be detected in the 

 present species. 



TeLLINA (PaL^OM(ERA ?) QUADRATA, GaBB. 

 Tellina quadrata, Gabb.— Pal. Cal., Vol. I., p. 159, pi. 23, fig. 138. 



Middle Shales, Division D, north-west side of Hornby Island; J. 

 Eichardson, 1872. A well preserved and nearly perfect left valve. 



Tellina (Peron.«;a) occidentalis. Meek. (Sp.) 



Plate 17, figures 11 and 12 a. 



Thracia (.?) occidentalis, Meek.^Trans. Alb. Inst., 1857, Vol. IV., p. 44. 



—Bui, Geol. & Geogr. Suiv. of Terr., Vol. II., No. 4, p. 

 363, pi. 2, figs. 3 and 3a. 



* See Meek's Report on the Cretaceous and Tertiary Fossils of tlie Upper Missouri Country, 



p. 195, pi. 2, flgS. 11, a,b. . 



t American Journal of Conchology, Volume VL (1870-71), p. 74. 



