Alaska and California. 469 
joined to it by a shallow superficial groove. ‘Transverse sec- 
tion a little ovoid, the wider arch away from the gastropore, 
and marked by a vertical, narrow, spongy lamina forming the 
style. The exterior margin simple, not elevated above the 
general surface, but rather slightly depressed below it. 
Neither sort of pore shows tabule. Ampulle simple, sac- 
shaped cavities as large as or larger than the calyces, not pro- 
truding above the general surface, but more numerous on the 
prominences of the crust. 
General surface between the above-described openings 
impervious, nearly smooth, with the vermicular fine reticula- 
tions of the coenosteum structure showing through the trans- 
lucent substance, and giving the surface a granular look, a 
vertical section of the crust looking much the same. Soft 
parts unknown. Crust growing several inches in diameter, 
and rarely more than three-eighths of an inch in thickness, 
generally found on dead shells of MJodzola or pieces of Nulli- 
pore from deep water. 
Habitat. Thrown up on beach of Chika Islands, Akutan 
Pass, Aleutian Islands, near Unalashka. Five specimens 
collected May 1872 by W. H. Dall. Catalogue number, 
U.S. Nat. Museum, 4193. 
Allopora Moseley?, n. 8. 
Coenosteum thick, nodulous, or indistinctly branched, rosy 
pink, solid, with an irregular vesicular surface with sporadically 
distributed protuberant calyces, consisting of subcircular gas- 
tropores, deeply vertically grooved near their margins by from 
seven to twelve dactylopores, whose cavities are continuous 
with the cavity of the gastropore. Ampulle not observed. 
Diameter of the dactyloporic circle about 1°5 millim. ; of the 
gastropore proper 0°75 millim. Gastropores rather deeply 
(0°50-0°75 millim.) cup-shaped, with the inner surface spicu- 
lose; style as in the preceding; margin of the pore deeply 
indented by the dactylopores, which are usually nine in 
number, but appear to be normally twelve ; the whole calyx 
projecting, nipple-like, about 0°5-0°6 millim. from the general 
surtace ; recalling, in form, a small contracted Zoanthus. A 
spiculose lamellar style appears in the depth of each dactylo- 
poric groove oncareful search. The grooves appear to remain 
always open. 
General surface impervious, covered between the raised 
calyces by small irregular sparse vesicular projections of the 
ccenosteum, otherwise in appearance and compactness much 
as in the previously mentioned form. Soft parts unknown, 
