394 DEAR CENWSEERH OM PSONSEBYEDIR OMID ZE 
doubt truly circumpolar. It seems to take the place completely 
in northern latitudes of-S. polygonias, from which it merely 
differs in its gigantic size. 
Sertularella rugosa, L. 
"This species is represented by specimens from one station 
only, that namely in Yugor Shar. "That is to say, it IS fömme 
in the near neighbourhood of its known habitat of Barents Sea, 
but no specimens were got from more distant stations to iink 
it with the large variety recorded by Clarke from Alaska. 
The Vega specimens differ in no way from typical British 
examples. 
Sertularella tricuspidata, Alder. 
Pl: 14, fig 3. 
This common northern species is present among the ma- 
terial from almost the whole of the Vega's northern course. It 
is also one of Clarke's Alaskan species. It is conspicuously 
absent from any of the stations where the depth explored ex- 
ceeded 15 fathoms, although it is recorded by Hincks from 
100 fathoms off Greenland. 
The most easterly specimens (long. 173? 24' W.) are slightly 
different in character from the type: the hydrothece are more 
everted, and less immersed in the stem, and are also set closer 
together. These features seem all to be shared by Clarke's 
Alaskan specimens. This form appears to be Kirchenpaur's 
var. acuminata. 
Range: Yugor -Shar to. 1217-20 E. long. > WVarietysemnon 
[7524 Tonge: 
Sertularia arctica, Allman (Qy-) 
P1) feN0EEST PENNOR fo ande 
A BSertularian, which is either identical with, or very little 
removed from Allman”s Spitzbergen species S. arctica, occurs 
from several stations to the westward of Long. 113? 30 E. 
The zoophyte is a little larger and coarser than Allman's, 
and the main stem is sometimes slightly branched: but the 
only marked diversity is in the absence of the constriction 
described by Allman in the middle of the gonangium. 
Localities: Long. 1132:30/ E.,-15 fathoms; J210205tEEEt 
fathoms (fragment); 173? 241 Wi. L2t0o t5tathomst! 
This species is very like S. albimaris, Mereschkowsky, 
but the hydrothece seem distinctly longer and less immersed. 
