Well it's been a few years since I actively studied cottids, but when I left
off collecting these critters in the Bering Sea - National Marine Fisheries
Surveys,  the closest species to your request were:

1)Dasycottus <setiger> Bean,1890- (Spinyhead sculpin)

2)<Icelus> spiniger Gilbert,1896-(Thorny sculpin) of roughly seven
species common in the N. Pacific.

3) Icelinus has about 8 species common to the same area. None of
which would fall into your "extremely rare" category, since they tend to
be fairly common in certain parts of Alaskan waters. Icelinus=from the
Greek Hicelos, meaning "God of sleep".

from: Kessler, D.W. 1985. Alaska's Saltwater Fishes and othe sea life.
;  Lamb, A. & P. Edgell.1986. Coastal Fishes of the Pacific Northwest and
Eschmeyer,Herald & Hammann.1983. A Field Guide to P. Coast Fishes of
N. America.

<..... > signs added for emphasis!

Jeff Parkhurst
Washington Dept. of Fish and Wildlife
600 Capitol Way North
Olympia, WA 98501-1091, USA
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Computer Information Consultant,
part-time Gilbertonian,
Gilbert Ichthyological Society 9th Annual Meeting, June 26-July 2, 1997
University of Washington, Seattle, WA, USA