REPORT ON THE ASTEROIDEA. 
27 
teres. Of these only one species, Pontaster tenwispinus, with its variety platynota, 
extends into the Abyssal zone. 
Seven species are found in the Abyssal zone, viz., Pontaster forcipatus and 
its variety echinata, Pontaster mimicus, Pontaster pristinus, Pontaster sub- 
tuberculatus, Pontaster tenwispinus and its var. platynota, Pontaster trullipes, 
and Pontaster venustus. 
Four of these are found in depths greater than 1000 
fathoms, viz., Pontaster forcipatus and its variety echinata, Pontaster pristinus, 
Pontaster trullipes, and Pontaster venustus. 
Greatest range of one species: Pontaster venustus, 900 to 2025 fathoms. 
y. Nature of the Sea-bottom: Five species, viz., Pontaster forcipatus, Pontaster pla- 
neta, Pontaster pristinus, Pontaster teres, and Pontaster trullipes, are found on 
Blue mud only, excepting the variety echinata of Pontaster forcipatus, which is 
found on Globigerina ooze. Pontaster venustus is found on Globigerina ooze and 
Pteropod ooze. 
Three species are found on Green mud only, viz., Pontaster 
mimicus, Pontaster oxyacanthus, and Pontaster subtuberculatus. 
Pontaster 
tenuispinus and Pontaster limbatus, in the Continental zone, occur on various 
bottoms. Pontaster hebitus-on gravel and stones. 
Chorological Synopsis of the Species. 
Ocean. Range in fathoms. Nature of the Sea-bottom. 
Pontaster forcipatus Atlantic. 1240 to 1700 Blue mud. 
Pontaster forcipatus, var. echinata Southern Ocean. 1375 Globigerina ooze. 
Pontaster Hebitus Atlantic. 85 Gravel, stones. 
Pontaster limbatus . . | Atlantic. OOMtOs44 OR Sy esas 
Pontaster mimicus j) Eastern Archi- | | 800 Green mud, 
| pelago. J 
Pontaster oxyacanthus Pacific, 345 Green mud. 
Pontaster planeta Pacific. 245 Blue mud, 
Pontaster pristinus Atlantic. 2650 Blue mud. 
Pontaster subtuberculatus Pacific. 950 Green mud. 
Pontaster tenuispinus . . | Atlantic. OECON (1S: n | eer 
Pontaster tenuispinus, var. platynota| Atlantic. 1100} 06 0.85505 ers se 
Pontaster teres {| Eastern Archi- | | 140 Blue mud. 
UU pelago, J 
Pontaster trullipes Pacific. 1050 Blue mud. 
Pontaster venustus Atlantic. 900 to 2025 f peerouod ooze. (900 fathoms). 
| | | Globigerina ooze (2025 fathoms). 
Pontaster venustus, var. robusta . | Atlantic. | 
1 These two limits are given on the authority of Danielssen and Koren. 
oo0cce 
Zoologi. xi. Asteroidea, Christiania, 1884. 
Den Norske Nordhays-Expedtion, 
