WHITEAVE8.] CRETACEOUS FOSSILS, NORTH WEST TERRITORY. 169 



Protocardium Hillanum, (?) Var. 



Cardium Hillanum, Sowerby. 1813. Mm. Conch., vol. I., p. 41, pi. 14, flg. l. 



d'Orbigny (asofSby.) Pal. Franc, Terr. Cret., vol. iii. n 



27, pi. 243. 

 Protocardium milanum, Stoliczka. 1871. Paloeont. Indica. Cret. Faun. S. 



India, vol. iii, p. 219, pi. 12, figs. 8-10 and d1. 13, figs. 1-3. 



Whiteaves.— 1884. Geol. and Nat. Hist. Surv. Can., 



Mesoz. Foss., vol. 1, p. 228, pi. 30, fig. 5. 



Three casts of the interior of single valves and a similar cast of a 

 pair of partially displaced valves of a rather large species of Proto- 

 cardium, which seems to differ from P. Hillanum only in being rather 

 more produced behind and consequently a little longer than high. The 

 maximum length of the largest specimen collected at this locality is 

 thirty-nine millimetres and its greatest height, inclusive of the beaks, 

 thirty-four mm., or as measured in the centre, just behind the beaks, 

 thirty mm. The impressions left by the radiating ribs on the pos- 

 terior area are plainly visible on these casts, but no traces of any con- 

 centric markings can be detected on the remainder of their surface. 

 In d'Orbigny's figures of a cast of a French specimen of C. Milanum 

 the maximum length and height are represented as exactly equal, but 

 the small specimens from the Queen Charlotte Islands which the pre- 

 sent writer has identified with that species, like those from the Eocky 

 Mountains now under consideration, are a little longer than high. 



Cyprina occidentalis, Whiteaves. 



Cyprina occidentalis, Whiteaves. — 1884. Geol. and Nat. His. Surv. Can., Mesoz. 

 Foss., vol. 1, p. 227, woodcut, fig. 10. 



One small but nearly perfect oast of the interior of both valves and a 

 less perfect but in other respects similar cast of a left valve, both of 

 which can be somewhat confidently identified with this species, which 

 is neariy related to the 0. Dallii of White,* from the Cretaceous rocks 

 of Alaska. 



•Bull. U. S. Geol. Surv., Washington, 1884, p. U.pl.vi., fig. 1. 



