Alaska and California. 471 
so crowded that little of the surface is free from the nariform 
hoods of the attendant dactylopores ; the gastropores average 
0°25 millim. apart, but are rather irregular and occasionally 
sporadic; a rounded, rather smooth-topped style fills the pore 
nearly to the brim; the dactylopores are arranged alternately 
on opposite sides of the row of gastropores opposite the 
intervals between the latter, though sometimes crowded out of 
regularity ; they are furnished with subtubular projections, 
squarely truncated at the top and open toward the gastro- 
pores, rising above the general surface to about 0:5 millim. 
or more; when perfect the styles rise nearly to the summit of 
the enclosing hood, slender, pointed, and rather feathery ; 
two thirds of their length, in general, is above the -surface, 
and the depth of the gastropores is seldom greater (as a rule 
less) than that of the submerged portion of the others. Am- 
pulle on the surface, barely covered by a network of ccenosteal 
granules, which are often broken away, leaving shallow 
open cups between the projecting hoods ; there are no scales, 
and the circular margin of the gastropores is smooth and 
simple. 
Soft parts unknown. | 
Habitat. In 50-100 fathoms about the Farallones Islands, 
off the coast of California, on stones which are frequently 
brought up on the fishermen’s hooks entangled in the corals. 
A large stone with several specimens upon it was obtained 
by Count Pourtalés in 1873, and is now in the Museum of 
Comparative Zoology at Cambridge, from which the speci- 
men described was selected; other specimens are in the col- 
lection of the California Academy of Sciences. This coral, 
as well as Allopora venusta and A. californica, Verrili, meet 
with a ready sale in San Francisco, owing to their beautiful 
colour, which, however, is not lasting if the specimens be 
much exposed to the light. ‘The present species seems to do 
a good deal toward bridging the gap between Hrrina and 
Distichopora, as defined by Moseley. Museum number 6853. 
I may add, in conclusion, that through the kind co-opera- 
tion of Prof. G. O. Sars and Miss Birgithe Esmark, I have 
been enabled to compare the Alaskan and Norwegian Allo- 
poras, which, however, do not present any very marked points 
of resemblance outside of the generic characters. } 
