152 



Thetiopsis circularis, Meek & Hatden. (Sp.) 



Venus (?) eircularu, Meek k Haydcn.— Proc. Ac. Nat. Sc. Phil., 1856, Vol. VIII., p. 272. 

 Cyclina (7) circularis, Meek. — SniithsoDian Check-Hit N. Am. Cret. FoB»il», 



1864, p. 13. 

 Lucina Eichardsonii, Whiteaves. — Qeol. Suiv. of Can., Rep. of Progr. for 1873-74, 



p. 266, plate of fossils, fig. 1. 

 Thetis {f) circularis. Meek. — Rep. on Inv. Cret. and Tert. Foss. of the U. 



Miss. Co., 1876, p. 190, pi. 17, figs. 8, a, b, e. 



Hornby Island, north-west side, in Division D (one). Nanftimo Eiver, 

 V. I., ten miles up (one), and at the Sucia Islands (two), in Division A; 

 J. .Richardson, 1871-75. 



The type of Lucina Bichardsonii, from ten miles up the Nanaimo Eiver, 

 is a nearly perfect specimen with the valves closed, and consequent! j 

 with all the characters of the interior hidden from view. In proposing 

 a provisional name for this shell the writer was much influenced by the 

 statement previously made by Mr. Billings, on the authority of Messrs. 

 Meek, Hayden & Gabb, that " the fossils of the Cretaceous formation on 

 the east side of the Eocky Mountains are nearly all specifically distinct 

 from those that occur in rocks of the same age on the west side,"* though 

 the facts of the case, as we nowf know them, are far from corroborating 

 this statement. One of the Sucia Island specimens of this species 

 shows the pallial sinus very well, alno the curiously crenated margin 

 of the pallial line on either side of it, a^ i all four accord exactly with. 

 Meek's figures and description of Thetis circularis, though Meek says 

 that the beaks of T. circularis are curved obliquely forward and inward, 

 whereas the beaks of Mr. Eichardson's shells are divergent and curve 

 outwards at their apices, much as in n^st species of Dosinia. 



Veniella crassa. (N. Sp.) 



Plate 18, figure 1. 



Shell tumid, gibbous, but not as thick as high, very inequilateral; 

 outline transversely ovate or ovately subtrigonal ; length nearly a third 

 greater than the height ; test thick, except round the ventral margin, 

 where it suddenly becomes thin and sharp. Anterior side very short, 

 its margin slightly concave from the beaks to the middle, below which it 

 rounds rapidly and abruptly into the curve of the ventral border ; posterior 

 side elongated, somewhat wedge shaped, but apparently obliquely 



* Geological Survey ol Canada. Report or Progress for 1872-73, p. 71. 



