[WHITEAVES] PALLISER’S CRETACEOUS FOSSILS 105 
CORBULA SUBTRIGONALIS, Meek and Hayden. 
Corbula subtrigonalis, Meek and Hayden. 1856. Proc. Ac. Nat. Se. Philad., vol. 
viii., p. 116. 
i By Meek. 1876. Rep. U.S. Geol. Surv. Terr., vol. ix., p. 529, 
pl. 40, figs. 3, a-b. 
= White. 1880. U.S. Geol. Surv.; Contr. to Pal., Nos. 2-8, p. 80. 
sf s White. 1883. Rev. Non-Marine Foss. Moll. N. Amer., p. 36, 
pl. 19, figs. 10-15. 
ee sf Whiteaves. 1885. Contr. to Canad. Palæont., vol. i, pt. 1, 
p. 62. 
On the same small piece of rock as the preceding species: one full- 
sized right valve and a small left valve. 
CORBULA SUBTRIGONALIS, Var. PERUNDATA. 
Corbula perundata, Meek and Hayden. 1856. Proc. Ac. Nat. Sc. Philad., vol. Viii., 
p. 116. 
fe Meek. 1876. Rep. U. S. Geol. Surv. Terr., vol. ix., p. 536, 
pl. 40, figs. 4, a-d. 
Corbula subtrigonalis, var. perundata, White. 1883. Rev. Non-Marine Foss. Moll. 
N. Amer., p. 36, pl. 19, figs. 16 and 17. 
Corbula perundata, Whiteaves. 1885. Contr. to Canad. Palæont., vol. i., pt. 1, p. 69. 
With the two preceding species. This shell could very well be No. 
36 of the list on page 243 of Captain Palliser’s report, as it has much the 
aspect of a small Crassatella. A small Corbula from the Laramie of 
Wyoming, which Dr. C. A. White regards as one of the forms of ©. sub- 
trigonalis, has indeed been called C. crassatelliformis by Meek. 
B.—From the Pierre-Fox Hills or Montana formation of the Plains. 
PECTEN, or SPONDYLUS, Sp. 
Ostrea lugubris, Etheridge. 1861. In Hector’s paper in the Quart. Journ. Geol. Soc. 
Lond., vol. xvii., p. 415, but apparently not O. lugubris, Con- 
rad, 1857. 
os re Etheridge. 1863. No. 8 of the list on page 242 of Capt. Palliser’s 
report. 
A specimen labelled “ No. 8, Cretaceous shale of Long River and 
Forked Creek, Souris Hills” (Manitoba), “ Ostrea lugubris, Dr. Hector, 
1857,” is a cast of the interior of one valve of a small bivalve, a little 
more than three millimetres in height, and slightly less than that in length. 
It is moderately convex, symmetrical, and nearly circular in outline, with 
a flattened central beak, which is sharply angulated on both sides, and a 
surface marked with radiating ribs of unequal size. It is scarcely pos- 
sible to determine to what genus this specimen should be referred, but it 
gives one the impression of being, perhaps, the cast of a valve of a very 
young shell of a species of Pecten or Spondylus, rather than that of a 
young Ostrea or Anomia. 
