IN2 D'ARCY W. THOMPSON, HYDROIDA. 
Obelia longissima, Pallas. 
Some very poor specimens from 176? 6' W. long., seem to 
be referable to this species, but small, dry and imperfect spe- 
cimens are scarcely to be distinguished for certain from the fore- 
going. &O. longissima occurs, but not O. dichotoma in Clarke's 
Alaskan lists. 
Gonothyr2ea hyalina, Hincks. 
One or two specimens occur from the station in 121-20; 
E. long., in the unasually shallow depth of four fathoms. This 
species is said by Clarke to be the commonest Campanularian 
on the Alaskan coasts. 
Filellum serpens, Hassall. 
I have detected this common epiphytic form in two locali- 
ties, namely in Long. 113” 30 EE. and in Long. L'Scsetenie 
Calycella syringa, Hincks. 
Although this species is recorded by Clarke from the 
Shumagin Islands, I have only met with specimens from the 
two most westerly stations in the Vega collection, namely from 
Nugsor Shar, and from the station. 10:00 246 Hö lone: 
Lafoäéa fruticosa, M. Sars. (Vid. Selsk. Forh., 1864.) 
Lafoéa gracillima, G. O. Sars. (Vid. Selsk. Forh., 1873). 
L. gracillima, S. F. Clarke. (Exploration of Alaska, 1876.) 
L. fruticosa, D. W. Thorapson. (Will. Barents Hydroids, 
1884). 
The only specimens of this form in the collection come 
from the station in Long. 116? E. at a depth of 36 fathoms. 
Its scarcity in the Vega collection is in marked contrast to its 
abundance on the Norwegian coast and in Barents Sea, but 
this may be due in part to the small depth of water in most 
of the Vega stations. Yet Clarke's Alaskan specimens, are 
from tide-marks to 15 fathoms, a very different range to the 
deep-water habitat of the same form in the N. Atlantic. 
