REPORT ON THE ASTEROIDEA. 223 
Chorology of the Genus Psilaster. 
a. Geographical distribution :— 
AtLantic: Four species between the parallels of 75° N. and 40° 8, 
Psilaster andromeda, off the Scandinavian coasts, and off the 
British Islands, extending to the Bay of Biscay. Psilaster cassiope 
and Psilaster patagiatus, off the Cape Verde Islands. Psiluster 
acuminatus occurs in the extreme South Atlantic, in Simon’s Bay, 
Cape of Good Hope. 
Paciric: Two species between the parallels of 40° N. and 50° §. 
Psilaster gracilis, off J apan. Psilaster acwminatus, off Australia 
and New Zealand. 
8. Bathymetrical range: Shallow water to 1875 fathoms. 
Four species, viz., Psilaster cassiope, Psilaster patagiatus, Psilaster andro- 
meda, and Psilaster acuminatus are found in the Littoral zone; and the two 
last named pass through the Continental zone and extend into the Abyssal zone. 
Psilaster gracilis is confined to the Abyssal zone. 
Greatest range of one species: Psilaster acuminatus, shallow water to 
950 fathoms. 
y- Nature of the Sea-bottom: Two species, Psilaster acuminatus and Psilaster 
gracilis, are found on Blue mud, the former also occurring on Green mud in 950 
fathoms. Psilaster andromeda inhabits a clay bottom, sometimes sandy. 
Chorological Synopsis of the Species. 
Ocean. Range in Fathoms. | Nature of the Sea-bottom. 
South Atlantic. Shallow. le. 4 coll iceameteees 
Psilaster acuminatus . .- ‘ ane f Green mud (950 fathoms). 
| South Pacific, 150 to 950 | Blue mud (150 fathoms), 
Psilaster andromeda. . North Atlantic, 40 to 690 Clay, sometimes sandy. 
Pesilaster cassiope . : : Atlantic. te ON a ee ceay 
Psilaster gracilis . : : Pacific. | 1875 | Blue mud. 
Psilaster patagiatus . : Atlantic. | sas (i = ema Oe er 
