402 THE VOYAGE OF H.M.S. CHALLENGER. 
Chorology of the Genus Ophidiaster. 
a. Geographical distribution :— 
AtLantic: Five species between the parallels of 10° and 45° N. 
*Ophidiaster attenuatus, Ophidiaster lessonx, and *Ophidiaster 
ophidianus, from the Mediterranean, the last named extending to 
the Canary Islands and Cape Verde Islands. Ophadiaster florid, 
from Florida. Ophidiaster guildingiw, from St Thomas, Antilles. 
Inp1an Ocean: Six species between the parallels of 30° N. and 30° S. 
Ophidiaster hemprichi from the Red Sea. Ophidiaster pur- 
pureus, from Mauritius and the Seychelle Islands. Ophidiaster 
duncani, Ophidiaster perriert, Ophidiaster robillardi, and *Ophi- 
diaster cylindricus, from Mauritius, the last named extending into 
the Eastern Archipelago and Pacific. 
Eastern ARCHIPELAGO: Six species between the parallels of 20° N. and 20° S. 
*Ophidiaster cylindricus, from the Moluccas, and extending into 
the Indian Ocean and Pacific. Ophidiaster fuscus, from Migupou. 
Ophidiaster pustulata and Ophidiaster pusillus, from Flores and 
Amboina, the latter also from the Philippine Islands and extending 
into the Pacific. *Ophidiaster tuberifer and *Ophidiaster helicos- 
tichus, from Torres Strait. 
Pactric: Seven species between the parallels of 30° N. and 40° S. 
Ophidiaster agassizi, from Juan Fernandez. Ophidiaster 
gracilis, from the west coast of Columbia. Ophidiaster chinensis, 
off the coast of China. Ophidiaster cribrarius, from the Samoa 
Islands. Ophidiaster germant and Ophidiaster pusillus, from 
New Caledonia, the latter extending into the Eastern Archipelago. 
*Ophidiaster cylindricus, from the Fiji Islands, and extending into 
the Eastern Archipelago and Indian Ocean. 
8. Bathymetrical range; Shallow water to 450 fathoms. 
y. Nature of the Sea-bottom: Recorded in comparatively few cases. Ophidiaster 
attenuatus and Ophidiaster ophidianus were found by the Challenger on Vol 
canic mud, Ophidiaster helicostichus and Ophidiaster tuberifer on Coral mud, 
and Ophidiaster cylindricus on Coral reefs. 
The localities of Lamarck’s species Ophidiaster arenatus and Ophidiaster bicolor are 
unknown, and neither of the forms have been subsequently recognised. 
The species collected by the Challenger are indicated in the foregoing list with an asterisk. 
