46 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



This Arctic, or at least cold-water species, was obtained at stations 

 2, 3, and 5, Hudson Bay. It is not the same as P. karsteni Reuss, as 

 a reference to the original figures will show, especially the ventral 

 side. The figures given by Parker and Jones of Arctic specimens are 

 very excellent for this species as it occurs in Hudson Bay. There is 

 little or no trace of any carina on the ventral side except that the 

 material filling the sutural depressions sometimes becomes confluent 

 along the peripheiy. This species was referred by Brady to P. 

 karsteni in 1864, and he has been followed since. Brady's notes in 

 1864 are interesting in this connection. 



"Three or four small starved specimens of this species have been 

 pointed out amongst my mountings by Mr. Parker. * * * As I 

 have never met with mature specimens, I can only refer to Professor 

 Reuss's memoir on the Chalk of Mecklenburg,^^ and in this instance I 

 have preferred copying his figures of the shell to drawing direct from 

 immature specimens." 



The following quotation is from Parker and Jones in 1865: 



"This is a neat, many-chambered, moderately conical variety of 

 P. repanda, with some degree of limbation bordering the chambers, 

 especially beneath, where a wheel-like system of exogenous shell 

 matter characterizes the shell." 



They also note the differences between the Arctic and North Atlan- 

 tic specimens referred to this species and also that Reuss's figure is 

 not exactly like either. 



P. jrigida is evidently an Arctic species of definite distribution and 

 definitely characterized. 



There are numerous references for this species in the North Atlan- 

 tic. It is not the same as Reuss's species from the Cretaceous. The 

 filling of the ventral sutures is a characteristic feature. 



Eponides frigida — Material examined 



"Zeitschr. Deutsch. Geol. Gesellsch., vol. 7, 1855, p. 273, pi. 9, fig. 6. 



