REPORT ON THE ASTEROIDEA. 171 
8. Bathymetrical range: 7 fathoms to 1325 fathoms, 
All the species extend into the Abyssal zone, but none of them are exclu- 
sively confined to it. 
Greatest range of one species : Ctenodiscus procurator, 40 to 1825 fathoms. 
y- Nature of the Sea-bottom: Ctenodiscus corniculatus is found on variable bottoms ; 
but usually on mud and soft clay; occasionally hard and shelly. Ctenodiscus 
australis is found on sand, and on Green sand in 600 fathoms. Ctenodiscus 
procurator has only been found hitherto on Blue mud. 
Chorological Synopsis of the Species. 
Ocean. Range in Fathoms. | Nature of the Sea-bottom. 
: : ; Sand; Green sand 
Ctenodiscus australis. : . | South Atlantic. 55 to 600 { (600 fathoms). 
Ctenodiscus corniculatus . ; ‘ North Atlantic. 7 to 632 Mud and Soft clay ; 
hard occasionally. 
Ctenodiscus procurator  . : : South Pacific, 40 to 1325 Blue mud. 
1. Ctenodiscus corniculatus (Linck), Perrier. 
Astropecten corniculatus, Linck, 1733, De Stellis marinis, p. 27, tab. xxxvi., No. 63. 
Asterias crispata, Retzius, 1805, Dissert. sist. species cognitas Asteriarum, p. 17. 
Asterias polaris, Sabine, 1821, in Parry’s Journ. of a Voyage for the Discovery of a N.W. Passage, 
&c., in 1819-20, Append., p. cexxiii., pl. i. figs. 2, 3. 
Asterias arancia, Dewhurst, 1834, Nat. Hist. of the Order Cetacea, &., p. 283. 
Astropecten polaris, Gray, 1840, Ann. and Mag. Nat. Hist., vol. vi. p. 180. 
Ctenodiscus polaris, Miiller and Troschel, 1842, System der Asteriden, pp. 76, 129. 
Ctenodiscus pygmeus, Miiller and Troschel, 1842, System der Asteriden, pp. 76, 129. 
Ctenodiscus crispatus, Diiben and Koren, 1846, K. Vet.-Akad, Handl., 1844, p. 253. 
Anodiscus crispatus (1 Val. M.S.), Perrier, 1869, Ann. Sci. Nat., 5e Sér., t. xii. p. 298. 
Ctenodiscus corniculatus, Perrier, 1876, Révis. Stell. Mus., p. 380 (Arch. de Zool. expér., t. v. p. 300). 
Localities.—“ Porcupine” Expedition : 
Station 82. In the Faerée Channel. Lat. 60° 0’ 0” N., long. 5°13’ 0” W. Depth 312 
fathoms. Bottom temperature 5°:2 C.; surface temperature 11°°2 C. 
Station 57." In the Faerée Channel. Lat. 60° 14’ 0” N., long. 6°17’ 0” W. Depth 632 
fathoms. Bottom temperature —0°'8 C. ; surface temperature 11°*1 C. 
Station 58." In the Faerée Channel. Lat. 60° 21’ 0” N., long. 6° 51’ 0” W. Depth 540 
fathoms. Bottom temperature —0°-6 C.; surface temperature 10°6 C. 
1 This occurrence is recorded in Sir Wyville Thomson’s Depths of the Sea, but I have not seen a 
specimen, 
