468 Prof. W. H. Dall on Hydrocoralline from 
They are closely allied to species found in the Oregonian and 
Californian province described by Prof. Verrill, but have 
been, by his kind assistance, compared with his types, and 
appear to him and to myself to be distinct species, differing 
not only in habit and form, as well as relative size of the 
calyces, but especially in the sculpture and texture of the 
surface of the corallum. It is quite probable that the other 
species may hereafter be found in South-eastern Alaska, in 
which case the fauna would comprise :— 
Allopora venusta, Verrill; Allopora Verrillit, Dall; Allo- 
pora californica, Verrill ; Allopora Moseleyt, Dall; Allopora 
paptllosa, Dall. 
To complete the list of Alaskan coralloid animals, Calli- 
gorgia compressa of Verrill may be added, as found in the 
Aleutian Islands, the only representative of the sea-fans yet 
known from the region, which is, however, extremely rich in 
Sertularian Hydroids. 
Allopora Verrillii, n. s. 
Coenosteum thin, reptate, whitish to pale rose-pink, solid, 
incrusting ; with a smoothish irregularly lumpy surface, pretty 
regularly dotted with sporadic calyces, composed of circular 
gastropores, each surrounded by a circle of from five to nine 
dactylopores, with occasional sac-shaped ampulla, which are 
most abundant on the most elevated projections of the surface 
and almost entirely absent from depressed parts. Diameter of 
the dactyloporic circle about 1:0 millim., of the central gas- 
tropore about 0'37 millim. ; the distance from centre to centre 
of the calyces varies from 1°5 to 2°5 millim. 
Gastropores cup-shaped, shallow (0:25-0°50 millim.), 
smooth inside, with the tip of a white spiculose nipple-shaped 
or roundly conical style in the bottom of each, projecting about 
its own diameter or less into the cup through the aperture of 
a long, nearly vertical, conical tube, which it occupies and 
closely fills. The length of this style, which resembles a 
fox’s brush, is nearly equal to the thickness of the ccenosteum. 
The margin of the cup in fully developed gastropores is 
simple and entire, and depressed slightly below (or in no case 
elevated above) the general surface. In immature calyces 
there is frequently a shallow groove running from the inner- 
most point of each dactylopore toward or into the gastropore. 
Dactylopores variable in number, eight seeming to be the 
normal, but seven the most common number, never sporadic, 
in well-developed calyces entirely separated from the cavity of 
the gastropore throughout their extent; in immature ones 
