393 



the specimen figured are said to be : length, 0-75 inch ; height, 0'47 ; and 

 breadth or convexity, 0'40 inch. 



Ill the collections made by Sir James Hector during Captain Palliser's 

 explorations, there are two small specimens from " Departure Bay, Na- 

 naimo, V. I.," obtained in 1860, that are probably referable to this species. 



Specimens of a small Area, that may be referable to A. Vancouverensis, 

 were collected at Hornby and Denman islands by Mr. Richardson, in 

 1872, and at Extension mine, near Nanairao, by Mr. Harvey, in 1901. 

 The largest of these is not quite an inch and a half in its greatest length. 

 But it is still uncertain whether the two large single valves from Blunden 

 Point, Y. I., that are figured on plate 19 (figs. 1 and la) of the second 

 part of this volume, and two casts of the interior of large single valves, 

 collected on the Saable River, Y. L, by Mr. Richardson, in 1872, should 

 be regarded as adult specimens of A. Vajicoitverensis, or as a distinct 

 species. These large shells have precisely the same kind of hinge denti- 

 tion as the much smaller specimens, a character upon which Conrad based 

 his genus Nemodon. 



A cast of the interior of the left valve of a small Area from Departure 

 Bay, Y. I., collected by Mr. Harvey, in 1901, is very similar in shape to 

 the Area {Neinodon) Cumshe?vensis of the Lower Shales of the Queen 

 Charlotte Islands, but in the former the beak is curved distinctly back- 

 ward. 



CucuLL.EA TRUNCATA? Gabb. (Yar.) 



CucuUcea trvncata? Gabb. 1864. Geol. Surv. Calif., Palaeont., vol. i, p. 196, pi. 25, fig. 



182. 

 CucuUaa ( Idonearca) truncata, Whiteaves. 1879. This volume, pt. 2, p. 165, pi. 19, figs. 



2 and 2 «. 

 Cuculloea truncata ? (Gabb) White. 1889. Bull. U.S. Geol. Surv. No. 51, p. 38. 

 Cfr. CucuUcea ponderosa, Whiteaves. 1900. This volume, pt. 4, p. 294, pi. 38, figs. 1 

 and 1 a. 



In the second part of this volume the writer referred specimens of a 

 rather large and thick shelled sp=icies of Cueulloea, from several localities 

 in the Yancouver Cretaceous, to the C. truneata of Gabb. Similar speci- 

 mens have since been collected, at the Sucia Islands, in 1894, by Dr. 

 Newcombe ; on Yancouver Island, in 1901, at Brennan Creek by the 

 Rev. G. W. Taylor, and six or seven miles north-west of Wellington by 

 Mr. T. Bryant ; also at Yorke's Farm, two miles and a quarter to two 

 miles and a half up the Nanaimo River, by Mr. Harvey. 



But, as pointed out on pages 295 and 296 of the fourth part of this 

 volume, " there are now some reasons for thinking that the specimens 

 from the Nanaimo group of the Yancouver and Sucia Islands Cretaceous 



