383 



Several specimens, that are clearly referable to this diminutive species, 

 were collected at Yorke's farm, two and a quarter to two and a half miles 

 up the Nanaimo River, V.I., by Mr. Harvey in 1901. 



Thyasira cretacea, Whiteaves. 



Conchocele cretacea, Whiteaves. 1874. Geol. Surv. Canada, Rep.lPro^r. for 1873-74, p. 

 266, pi. of fossils, figs. 2 and 2 a ; and (1879) this volume, pt. 2, p. 156. 



On page 784 of his " Synopsis of the Lucinaceee and of the American 

 species," published in 1901, in volume xxiii of the Proceedings of the 

 U. S. National Museum, Dr. Dall places Conchocele, Gabb, 1866 ; 

 Cryptodon, Turton, 1822; and Axinus, J. Sowerby, 1821 ; among the 

 synonyms of Thyasira, Leach, 1818. The proper name for this species, 

 therefore, would seem to be Thyasira cretacea, and the writer has seen no 

 other specimens of it than those collected below Dodd Narrows. V.I., by 

 Mr. Richardson in 1^73. 



Clisocolus dubius, Gabb. 



Loripesdubius, Gabb. 1864. Geol. Surv. Calif., Palaeont., vol. i, p. 177, pi. 24, figs 170 



and 171. 

 Clisocolus dubius, Gabb. 1869. Idem, vol. ii, p. 189, pi. 30, fig. 7. 

 Lticina Richardsonii, Whiteaves. 1874. Rep. Progr. of this Survey for 1873-74, p. 266, 



pi. of fossils, fig. 1. 

 Thctiopsis circularis, Whiteaves. 1879. This volume, pt. 2, p. 153. 

 Clisocolus dubius, White. 1889. Bull. U. S. Geol. Surv., No. 51, p. 41, pi. 6, figs. 5-7. 

 „ „ Whiteaves. 1895. Trans. Royal Soc. Canada, Second Series, vol. 



I, sect. IV, p. 123. 



As stated in the publication last cited, " the specimens from Van- 

 couver, Hornby and the Sucia Islands, which the writer first described as 

 Lucina Richardsonii, and afterwards referred to the Thetis circularis of 

 Meek and Hayden, the type of Meek's suggested genus Thetiopsis, are 

 obviously identical with the Clisocolus dubius as since figured by Dr. C. 

 A. White, and with specimens from the Chico group of Shasta county, 

 California, labelled C. dubius, and kindly loaned by Mr. Stanton. "It 

 still, however, appears to the writer that the specimens collected by Mr. 

 Richardson are much more like the Thetis circularis, as figured by Meek 

 and by Whitfield, than they are to Gabb's illustrations of C. dubius." 



Specimens of this species were collected at the Sucia Islands by Dr. 

 Newcombe in 1894; and at Departure Bay, V. I., by Mr. Harvey in 

 1901. 



