PELECYPODA. 



Pteeinea. 



Two casts of the interior of single valves of a species of Fterinea were 

 collected at Elora by Mr. Townsend in 1882 and 1892. One of these is the 

 cast of a small right valve, not quite seven millimetres in length and with 

 the posterior wing broken off, the other a nearly perfect cast<>f a left valve. 

 It is scarcely practicable to identify such specimens specifically, but in 

 many respects they agree fairly well with Hall's description and figures 

 of P. brisa, which is regarded as a synonym of F. strimcosta, McChesney. 



Amphic^lia neglecta, McChesney. (Sp.) 



Ambonychia neglecta, McChesney 1861. Descr. New. Pal. Foas., Exfcr. No. 



2, p. 88. 

 Pterinea (Amh.) neglecta, McChesney. . . . 1865. Expl. of pi. 9, fig. 2, Illust. New. 



Pal. Foss. 

 Amphiccelia neglecta, McChesney 1868. Trans. Ac. Sc. Chicago, vol. I., p. 



41, pi. 9, fig. 2. 

 Meek &Worthen.... 1868. Geol. 111., vol. III., p. 358, pi. 5, 



fig. 9. 

 Leptodomus neglectus, Whit^eM 1882. Geol. Wiscons., vol. IV., p. 292, 



pi. 18, figs. 3 and 4. 



Elora, J. Townsend, 1892 : an imperfect cast of the interior of the 

 right valve of a shell which is probably referable to this species. 



Megalomus Canadensis, Hall. 



Megalomus Canadensis, Hall 1852. Pal. N. York, vol. I., p. 343, pis. 80, 



, figs. 1, a-c ; 81, figs. 1, a-f ; and 82, figs. 1, a-i. 



Billings.. .1863. Geol. Canada, p. 3.38, fig. 342. 



Nicholson . 1874. Rep. Pal. Prov. Ont., p. 68, figs. 39, a-c. 



Gait, A. Murray, 1847, E. BilHngs, 1857, and T. C. Weston, 1867 ; 

 Guelph, E. Billings, 1857, Dr. R. Bell, 1861, and T. C.Weston, 1867 ; Hes- 

 peler, T. C. Weston, 1867 ; Elora, Dr. R. Bell, 1861, T. C. Weston, 1867, 

 and D. Boyle, 1873 ; Durham, J. Townsend, 1878-82 ; and Belwood, J. 

 Townsend, 1889. 



Casts of the interior of this remarkable shell are abundant in almost 

 every exposure of the Guelph formation in the province, but specimens 

 with the test preserved are rare. The species occasionally attains to a 

 comparatively gigantic size. Thus, a cast of the interior of the closed 

 valves found by Mr. Townsend at the junction of the Big and Rocky 

 Saugeen rivers, in the township of Bentinck, is seven inches and two-tenths 

 in length, six inches and three-tenths in height and four inches and nine- 



