274 



" Surface apparently smooth. 



" Spiralia directed toward the dorsal side (Schuchert) ; jugum, muscular 

 impressions, and hinge dentition unknown. 



" Dimensions of a typical and average specimen (from the Winisk 

 River) : maximum length, slightly over eight millimetres ; greatest width, 

 eight mm. and a half ; maximum thickness, four mm. 



"Two small loose blocks of limestone from or near the mouth of the 

 Winisk River, collected by Mr. W. Mclnnes in 1903, are almost exclu- 

 sively composed of nearly perfect shells of this species,- many of which 

 have the spiralia, or internal spiral cones, preserved. Some of the best 

 of these specimens have been examined by Mr. Charles Schuchert, who 

 writes as follows in regard to them in a letter dated March 9, 1904. 

 The spiral cones in the Winisk shell are directed toward the dorsal side, 

 but I cannot see the jugum. For the present I would refer it to Glassia. 

 In external characters it is very near to G. subovata (Sowerby) but the 

 difference in the spiralia will distinguish them, as the latter has the cones 

 inwardly or medially directed. This difference is certainly of specific 

 value, but for the pi'esent I should not regard it as of generic impor- 

 tance, as different genera of the Atrypidfe have the spiralia directed 

 either laterally, medially or dorsally." 



MOLLUSCA. 



Gasteropoda. 

 EuoMPHALUs, sp. indet. 



A cast of the interior of a specimen of a closely coiled Euompj/^dus, 

 that is perhaps conspecific with a similar cast from the lower rapid of the 

 Ekwan. From an exposure thirty four miles above the mouth of the 

 river. 



A cast of the interior of the shell of a species of Euomphalus or " Pha- 

 nerotinus", was collected at an exposure ten miles above the mouth of the 

 river. This cast shews little more than that the spire is depressed, and 

 that the whorls, which are flattened above and rounded below, are slender 

 and separate, though spirally coiled. Two smaller but otherwise similar 

 casts were collected by Mr. Low in 1886 at Limestone Rapid on the Fawn 

 River. 



Trochonema, sp. indet. 



An imperfect cast of the interior of a shell, with a flattened biangular 

 periphery, — that seems to be referable to this genus. From loose pieces 

 of limestone at or near the mouth of the river. 



