232 CONTRIBUTIONS TO CANADIAN PAL.'EONTOLOQY. 



milion Falls, P». G. McConnell, 1889 : two perfect but partially ex- 

 foliated specimens. The one from the Hay Eiver has eleven rounded 

 and undivided ribs on the mesial sinus, at the front margin, ten similar 

 ones on the fold, and fourteen or fifteen flattened ribs on each side. In 

 the larger of the two specimens from the Peace Eiver there are eleven 

 flat ribs on the sinus, ten rounded ones on the central fold, and eight- 

 een to twentj^ on each side. 



The rather coarsely ribbed variety of the species from the State of 

 New York to which Hall subsequently gave the name Rhynchonella 

 venustula, was originally identified by Conrad and Vanuxem with the 

 Atrypa cuboides of Sowerby. Under the heading of Rhynchonella 

 Emvionsi, also, Mr. G. D. Walcott remarks : — " There is very little 

 doubt but that B. intermedia, JR. Emmon&i and R. venustula are varieties 

 of R. cuboides." The three specimens collected by Mr. McConnell are 

 doubtless conspecific with the Nevada shell which has been called R. 

 Emmonsi, but they also appear to the writer to be quite indistinguish- 

 able from the R. venustula as figured by Prof Williams (op. cit., pi. 

 xiii, figs. 4 and 8), from some of the specimens of R. cuboides figured 

 by the same author, and from the coai-sely ribbed forms of R. cuboides 

 (var. impleta), illusti'ated by Davidson on plate xiii, figs. 20 and 21, of 

 his Monograph of British Devonian Brachiopoda. Prof. Williams (op, 

 cit., pp. 493-94) says that " R. venustula, Hall, is by common consent 

 closely allied to R. cuboides of Europe, the chief distinction lying in 

 the number of plications in the median fold and sinus which are less 

 than in the prevailing type of the European cuboides.'' Yet, in one of 

 the specimens of R. venustula figured by Professor Hall (op. cit. fig. 

 43) there are as many as ten radiating ribs in the mesial sinus of the 

 ventral valve. 



Ehynchonella castanea. Meek. 



Rhynchonella cantanca, Meek. 1868. Trans. Chicago Ac, So., vol. I, p. 9o, pi. 



xiii, figs. 9a-c- 

 Bhynchondla caglnnea, Walcott. 1884. Pal. Eureka Distr. Nev., p. 153, pi. xv, 



figs. 1, la, 4 and 4a. 



Mackenzie Eiver, at the "Eamparts," R. G. McConnell, 1888: one 

 perfect specimen. 



