558 THE VOYAGE OF H.M.S. CHALLENGER. 
6. Bathymetrical range: 14 to 1808 fathoms. 
Greatest range of one species: Pedicellaster typicus, 50 to 620 fathoms. 
Of the other species Pedicellaster margaritaceus and Pedicellaster sea- 
radvatus only occur in the Abyssal zone. The remainder inhabit the Littoral 
zone, and are not recorded from greater depths, excepting Pedicellaster 
pourtalesi, which extends into the Continental zone. 
y. Nature of the Sea-bottom: Pedicellaster typicus is found on Clay (sometimes 
sandy) and Stones; Pedicellaster paleocrystallus on a hard bottom ; 
Pedicellaster pourtalesi on fine sand; Pedicellaster scaber on Volcanic mud ; 
and Pedicellaster hypernotius on Volcanic sand. 
The species collected by the Challenger are indicated in the above list by an asterisk. 
Chorological Synopsis of the Species. 
| Ocean. | Range in Fathoms. Nature of the Sea-bottom, 
| 
| ; 
| Pedicellaster hypernotius . : Southern, 140 Volcanic sand. 
| Pedicellaster margaritaceus 4 Atlantic. 670 eee 
| Pedicellaster octoradiatus . : Atlantic. 14 soc 
Pedicellaster palxocrystallus Atlantic. 25 to 80 Hard bottom. 
Pedicellaster pourtalesi : Atlantic. 127 to 250 Fine sand. 
Pedicellaster sarsii . : : Atlantic. o0F see 
Pedicellaster scaber . é : Southern. 20 to 25 | Voleanic mud. 
| Pedicellaster sexradiatus . ; Atlantic. 1730 to 1808 ace | 
| Pedicellaster typicus . : : Atlantic. 50 to 620 Clay (sometimes sandy) ; Stones. 
1. Pedicellaster scaber, Smith. 
Pedicellaster scaber, Smith, 1876, Ann. and Mag. Nat. Hist., ser. 4, vol. xvii. p. 107; Phil. Trans., 
Zool. Kerguelen Island, 1879, vol. clxviii. p. 274, pl. xvi. fig. 3. 
Locality.—Station 149p. Royal Sound, Kerguelen Island. January 20, 1874. Lat. 
49° 28’ 0” S., long. 70° 13’ 0” E. Depth 20 to’25 fathoms. Volcanic mud. Surface 
temperature 41°:0 Fahr. 
Remarks.—This is a well-marked species, and is not merely a variety of Pedicellaster 
typicus, as suggested by Danielssen and Koren.’ 
2. Pedicellaster hypernotius, n. sp. (Pl. CV. figs. 5-7). 
Rays five. R=25 mm.;7=5mm. R=5r. Breadth of a ray at the base 5°25 mm. 
Rays elongate, narrow, tapering very slightly ; probably subeylindrical during life, 
more or less depressed in their present condition. Disk small, not distinguishable from 
the base of the rays. Interbrachial ares acute. 
1 Nyt Mag. f. Naturvidensk., Bd. xxvii. p- 274; Den Norske Nordhavs-Expedition, 1876-1878, Zoologi, 
xi. Asteroidea, Christiania, 1884, p. 40. 
