No. 4.] DAWSON — POST-PLIOCENE. 401 



Spirorhis sinish'orsa, Montague. 



Fossil — Riviere-du-Loup, on the inside of shells. 



Recent — Gulf St. Lawrence ; Fishing Banks, American Coast 

 (Gould.) 



Spirorhis carina fa, Montague. 



Fossil — Riviere-du-Loup, on shells. 



This is a Spirorhis with one carina, found also in the Gulf of 

 St. Lawrence, and possibly the same with the S. contort uplicata 

 of Fabricius from Greenland. 



a. 



The beautiful Spirorhis cancellata of Fabricius, so common 

 in the Modern Gulf of St. Lawrence, and also in Greenland, has 

 not yet been found in the Post-pliocene. 



Class IL — Crustacea. 



The most abundant species are bivalve Entomostraca, which 

 occur in great numbers in the Leda clay, associated with Forami- 

 nifera. The species in my collection have been kindly deter- 

 mined by Mr. J. S. Bra^y, who enumerates the following: 



Cythere MacCliCsneyi, nov. sp. 

 " Dawsoni (Brady). 



" glohidifera (Brady). 



" Loguiii, nov. sp. 



Cytheridea papillosa (Bosquet). 



'' jjunctillata (Brady). 

 Cytheridea Sorhyana (Jones). 

 Cytherura Rohertsoni (Brady). 

 Cytheropteron complaiiatinn, nov. sp. 

 " inflatum (B., C, and R., MS.) 

 " angidatum (B., C, and R., MS.) 

 Eucy there argus. 

 As the paper was re-printed in the Canadian Naturalist (Vol. 

 v., N. S.) it is unnecessary to notice these species further here, 

 except to state that out of twenty-nine species of recent Ostracods 

 obtained by Mr. Brady from material from the Gulf St. Law- 

 rence, furnished by me, thirteen have been recognized in the 

 Post-pliocene of Canada and Maine, though only three of these 

 occur in the list above given. It is further remarkable that out 

 of thirty- three fossil species from Maine and Canada, no less than 

 twenty-three occur in the Scottish glacial beds and twenty-five 

 are living in the British seas, while six are new species. 

 Vol. VI. s No. 4. 



