177 



Vancoiwerensis, it would seem that the only difference between that 

 species and A. lineata is, that in the latter shell the radiating markings 

 are somewhat coarser than they are in the former ; for in Mr. Gabb's 

 figure of A. lineata the " fine, linear, radiating ribs " are represented as 

 plainly visible to the naked eye. 



BEACHIOPODA. 



Terebratula Wacoensis, E(EMER. 



Terebratula Wacoensis^ Kcemer. — Die Kreidebildungen Von Texas, p. 81, pi. 6, figs. 2, a, 



bj c. 



Banks of the Trent River, V. I., in Division B; J. Richardson, 1871. 

 A well preserved and nearly perfect cast. 



Rhtnchonella. (Sp. undt.) 



Sucia Islands, in Division A ; J. Richardson, 1874. One nearly perfect 

 but immature specimen, which is litile more than a cast, and two or 

 three detached valves in an equally bad state of preservation. 



A rather coarsely ribbed species, with a shallow and indistinctly 

 defined mesial fold and sinus. The height and length of the shell 

 appear to be very nearly equal. The beak of the ventral valve is large 

 and prominent, and the number of ribs in the largest si^ecimen collected 

 is about twenty. 



DisciNA Yancouverensis. (N. Sp.) 

 Plate 20, figure 6, 



Upper valve, the only one known, large, depressed-conical, its margin 

 nearly circular in outline, but narrowing very slightly behind; ajiex 

 not very prominent nor much raised, placed a little on the posterior 

 side of the middle, but very nearly central. Sm-face marked apparently 

 with regularly-disposed, nearly equi-distant, concentric striations, or 

 raised lines of growth. 



Greatest diameter, about an inch and a quarter. 



S. W. Side of Ganges Harbour, on Salt Spring or Admiralty Island, in 

 Division A ; J. Richardson, 1874. An imperfect upper valve with the 

 surface water- worn, and consequently with the finer surface mai'kinga 

 obliterated. 



