wHiTEAVEs.] DEVONIAN FOSSILS, MACKENZIE RIVER BASIN. iil7 



Proddctella subaculeata, var. cataracta. 



ProdtLctella subacuhala, var. cataracta, Hall and ^A'hitfield. ]S72. 2ith Res. Eep. 

 N. Y. St. Cab. Nat. Hist., p. 198, and (1875) 27tli Reg. Eep. do., 

 pi. ix, figs. 9 and 10. 

 Productdla mbandeata, var. cataracta, Nettlewrolh. 1889. Kentucky Geo). Surv., 

 Kent. Foss. Shells, p. 69, pi xvii, figs. 5-9. 



Mackenzie Eiver, at the " Eock by the river side," E. G. jNIcConnell, 

 1888: four rather badly preserved but characteristic specimens. 



Prodcctella spinulicosta, Hall. 

 PI. 29, figs. 3, 3a, and pi. 31, fig. 1. 



ProducteUa spimdicosta, Hall. 1857. Tenth Reg. Rep. N. Y. St. Cab., p. 171. 



" 1867. Pal. N. Y., vol. IV, p. 160, pi. xxiii, figs. 

 25-37. 



Haj' Eiver, forty miles above its mouth, R. (}. McConnell, 188*7: five 

 well preserved and nearlj' perfect specimens, with some of the long 

 and slender spines entire and in place. 



Mackenzie Eiver, at Grand View, fortj^-four miles below the " Eam- 

 parts," E. G. McConnell, 1888 : four specimens, one of which is figured 

 on Plato xxxi, in which nearly all the spines are preserved entire, on 

 a small flat piece of argillaceous limestone. It is doubtful, however, 

 whether these are suflficiently distinct from P. subaculeata, var. cataracta. 

 Professor Hall expressly states that he is " not entire!}' satisfied' that 

 P. spinulicosta is S2iecifically different from his P. Shumardiana, and 

 this latter shell is I'egarded hy Mr. Walcott as probably identical with 

 P. subaculeata. 



Productella lachbymosa, var. lima. 



Strophomena lima, Conrad. 1842. .Tourn. Ac. Nat. Sc, Pliil., vol. VIII, p. 256. 

 ProducteUa lachrijmosa, var. lima, Hall. 1867. Pal. N. Y., vol. IV, p. 17-1, pi. 



XXV, figs. 29-32. 

 Produclus{Produclella) laclirijmosus,va.T. Ihnus; ■\^'alcott. 1884. Pal. Eureka distr. 



Nevada, p. 132, pi. xiii, figs. 18 and 18a. 



Mackenzie Eiver, at the "Eamparts," E. G. McConnell, 1888: a few 

 rather badly pi-eserved specimens, which are essentially similar to two 

 from the Eureka district of Nevada labelled P lachrymosa var. lima, 

 by Mr. C. D. Walcott, and kindly forwarded by him for comparison. 



