241 



larger than in any species of the genus except my R. grandis, in which 

 they are of about the same size. The obliquity of the apertures, which 

 is very marked, is the principal externah distinctive feature." The 

 specimen, however, is too imperfect to admit of a sufficiently detailed 

 description of the distinctive characters of the species. 



EscHAROPOEA EAMOSA 1 Ulrich, Var. (or N". Sp.?) 



Deer Island, J. B. Tyrrell, 1889 : two specimens of a small branching 

 Escliaropora, which Mr. Ulrich writes is either a "new variety of E. 

 ramosa, or possibly a new species, differing from the E. ramosa in its 

 smaller size and narrower and more rapidly divergent branches. The 

 surface is not sufficiently preserved for finer comparisons, but the diagonal 

 arrangements of the zocecial apertures and the pointed base point very 

 certainly to Escharopora." 



BRACHIOPODA. 

 Strophomena trilobata, Owen. (Sp.) 

 For references to publications in which this species is described, see page 169. 

 Deer Island, J. B. Tyrrell, 1889 : one small dorsal valve. 



Okthis (Dalmanella) testddinaria, Dalman. 

 References to publications in which this species is described are given on page 177. 

 Deer Island, D. B. Dowling, 1890 : one specimen. 



MOLLUSCA. 

 PELECYPODA. 



Cvrtodomta Canadensis, Billings. 



Cyrtodonta Canadensis, Billings 1858. Geol. Surv. Canada, Rep. Progr., 1857, 



p. 182, figs. 8-10. 

 1863. Geol. Canada, p. 148, fig. 106. 



A cast of the interior of the right valve of a Cyrtodonta, which is 

 much too imperfect to be determined specifically, was collected at Big 

 Grindstone Point, Lake Winnipeg, by T. 0. Weston in 1884. About 

 six miles to the south-west of this locality, at Little Grindstone Point, 

 eighteen specimens, which are also clearly referable to Billings's genus 

 Cyrtodonta, were collected by D. B. Dowling in 1891. All of these have 

 a considerable portion of the test preserved, but most of its outer 

 surface is covered or obscured by the tenacious matrix. Some of them 

 have essentially the same marginal outline as C. Canadensis, and are 

 probably referable to that species ; others have an unusually prominent 



