12 
extending to the periphery. From station 1 is a specimen, or rather two speci- 
mens in a plastogamic condition, which are evidently this same species. 
Brady’s original specimens were from off Nova Zembla and the species has 
been recorded by Heron-Allen and Earland from. the coasts of the British Isles... 
GENUS TRUNCATULINA D’ORBIGNY, 1826. 
Truncatulina lobatula (Walker and Jacob). 
Truncatulina lobatula Cushman, Rep. Canadian Arctic Exped., vol. 9, pt. M, 
1920, p. 9m. 
This species, which has already been recorded in the Canadian Arctic Ex- 
pedition occurs at station 3 in Hudson Bay. It is not as common, however, as 
might be expected. 
GENUS PULVINULINA PARKER AND JONES, 1862. 
Pulvinulina frigida Cushman, new species. 
Pulvinulina karsteni H. B. Brady (not Retss), Trans. Linn. Soc. London, vol. 29, 
1864, p. 470. 
Pulvinulina repanda (Fichtel and Moll), var. karstent Parker and Jones, Phil. 
Trans:, vol. 155, 1865; p. 396, pl. 14, figs, 14; 15, 17. 
Test small, biconvex, rotaliform, composed of about two and one-half coils; 
chambers distinct, usually six in the last-formed coil; sutures distinct but not 
depressed on the, dorsal side, on the ventral side slightly depressed and filled 
with an amorphous material radiating out from the umbilical region; wall clear 
and translucent on the dorsal side, usually showing all the chambers back to 
the proloculum distinctly, on the ventral side less clear. 
Diameter up to 0.4 mm. 
This Arctic, or at least cold water species, was obtained at stations 2,3, and 5. 
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 periphery. 
The 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 (Zeitsch. Deutsch. Geol. Gesellsch., vol. vii., 
p. 273, pl. 9, fig. 6), 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.”’ 
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