REPORT ON THE ASTEROIDEA. 537 
Chorology of the Genus Acanthaster. 
a. Geographical distribution :— 
InprAN OcEAN: One (or perhaps two) species between the parallels of 30° N. 
and 30° S. 
* Acanthaster echinites and Acanthaster mauritiensis from Mau- 
ritius, the former also from the Red Sea, and extending into the 
Eastern Archipelago and the Pacific. 
EasTeRN ARCHIPELAGO: One species between the parallels of 20° N. and 20° S. 
* Acanthaster echinites, from the Philippine Islands, the Moluccas, 
and other islands in the archipelago, and extending into the Indian 
Ocean and the Pacific. 
PactFic: Three (?) species between the parallels of 30° N. and 55° S. 
*Acanthaster echinites, from the Fiji Islands, and extending into 
the Eastern Archipelago and Indian Ocean. Acanthaster ellisu, 
from the Galapagos Islands and coast of California; also from New 
Hanover and New Britain (fide Studer). Acanthaster solaris, 
from the Strait of Magellan. 
6. Bathymetrical range : Confined to the Littoral zone so far as at present known. 
y. Nature of the Sea-bottom: Recorded in very few cases; Acanthaster echinites 
inhabits coral reefs. 
The species collected by the Challenger is indicated by an asterisk in the above list. 
Chorological Synopsis of the Species herein mentioned. 
| Ocean. | Range in Fathoms, | Nature of the Sea-bottom. 
| Shallow water. Coral reefs. 
Acanthaster echinites . . { 
Indian, Pacific, and | 
Eastern Archipelago. | 
1. Acanthaster echinites (Ellis and Solander), Liitken. 
Asterias echinites, Ellis and Solander, 1786, Nat. Hist. Zooph., tab. Ix., lxi., Lxii. 
Stellonia echinites, Agassiz, 1835, Mém. Soc. Sci. Nat. Neuchatel, t. 1. p. 192. 
Echinaster Ellisii (? pars), Gray, 1840, Ann. and Mag. Nat. Hist., vol. vi. p. 281. 
Acanthaster echinus, Gervais, 1841, Dict. Sci. Nat., suppl., t. i. p. 474. 
Echinaster solaris, Miller and Troschel, 1842, System der Asteriden, p. 25. ' 
Acanthaster echinites, Liitken, 1871, Videnskab. Medd. naturh. Foren. i Kjgbenhavn,’p. 292. 
(ZOOL. CHALL. EXP,—PART LI,—1888.) 68 
