VEGASEXPEDIT KÖNEN SI VETENSKAPRPEIGA ARBETEN. 395 
In actual size also they are larger. The hydrothece of the 
Vega specimens of S. arctica (?) measure 0,67 mm. in length; 
those of specimens from the Willem Barents collection which 
I have aseribed to S&S. albimaris, are only 0,44 mm. long; and 
those of Vega specimens of S. tenera, 0,53 mm. 
So. FöoClarke s Pacific and Alaskan collections: contaim no 
species allied to these three. 
Sertularia tenera, G. O. Sars. 
Pi, de 
This species described from 150 fathoms, off Stavanger, by 
Sars, occurs in the Vega collection from 40 fathoms in Long. 
92? 20 E.; a few fragments come also from shallow water in 
Yugor Shar. Its range is thus wholly to the westward of 
S. arciica. It is elosely allied to the latter species, but the 
hydrothec&e are more markedly subalternate, and are smaller, 
shorter and broader. Nevertheless the two are undoubtedly 
variants of a common form. 
The gonangia have not been found. 
Sertularia variabilis, S. F. Clarke. 
POSESInST and. 
One or two small specimens from 119? E. long., are to be 
referred to this species, described by Clarke from Alaska, 
andiärtecorded also by, Dall from California, Itis an ally of 
S. abietina. 
The length of the hydrothec&e in my specimens is 56 mm. 
Hydrallmania falcata, L. 
This species was got in Yugor Shar, and there only. It 
is common in Barents Sea. The occurence of a kindred species, 
H. Franciscana, Trask!, (believed by Clarke to be identical 
with H. falcata) on the Californian coast, is very inexplicable, 
as Hydrallmania does not occur in Clarke's North Pacific or 
Alaskan lists, and our Vega collection brings it only from the 
extreme west of the Old World. 
Locality: Yugor Shar, 5—8 fathoms. 
FERPaSkarRro es Calltorniant ACad-4tS5E6 bh prkS: 
Murray, Ann. and Mag. N. H., 1860, p.- 251. 
Clarke ibrans ti öonnsAcadst iso miiep200. 
