360 THE VOYAGE OF H.M.S. CHALLENGER. 
1. Porania pulvillus (O. F. Miiller), Norman. 
Asterias pulvillus, O. F. Miiller, 1788, Zool. Dan., vol. i. p. 19, tab. xix. figs. 1 and 2. 
Goniaster Templetoni, Forbes, 1839, Mem. Wern. Soc., vol. viii. p. 118, pl. iv. figs. 1 and 2. 
Porania gibbosa, Gray, 1840, Ann. and Mag. Nat. Hist., vol. vi. p. 288. 
Asteropsis pulvillus, Miiller and Troschel, 1842, System der Asteriden, p. 63. 
Asteropsis ctenacantha, Miiller and Troschel, 1842, System der Asteriden, p. 63. 
Porania pulvillus, Norman, 1865, Ann. and Mag. Nat. Hist., ser. 3, vol. xv. p. 122. 
Localities.—* Lightning” Expedition : 
Off Valentia. Depth and conditions not stated. 
“ Porcupine” Expedition : 
Station 8. Off the west coast of Ireland. Lat. 53° 15’ N., long. 11° 51’ W. Depth 
106 fathoms, Bottom temperature 10°°7 C.; surface temperature 12°°3 C. 
Several specimens without record of locality or depth. 
“ Knight Errant” Expedition : 
Station 3. Off the Island of North Rona, August 3 and 4, 1880. Lat. 59° 12’ N., 
long. 5° 57’ W. Depth 58 fathoms. 
2. Porania antarctica, Smith (Pl. LIX. fig. 3). 
Porania antarctica, Smith, 1876, Ann. and Mag. Nat. Hist., ser. 4, vol. xvii. p. 108; Phil. Trans., 
Zool. Kerguelen Island, &c., 1879, vol. clxviii. p. 275, pl. xvii. fig. 1. 
Localities.—Station 145. Off Marion Island. Depth 50 fathoms. 
Station 145a. Off Prince Edward Island. Depth 85 to 150 fathoms. 
Station 147. West of the Crozet Islands. December 30, 1873. Lat. 46° 16’ 0” S., 
long. 48° 27’ 0” E. Depth 1600 fathoms. Diatom ooze. Bottom temperature 34°°2 
Fahr. ; surface temperature 41°°0 Fahr., 
Remarks.—A good series of this species was collected. The spiny character is present 
in all stages of growth. ‘The rays are longer and more pronounced than indicated in the 
original figure. There is an example from the great depth of 1600 fathoms, in which I 
fail to find any difference worthy of note. The rays are well pronounced and narrow at 
the base, and the marginal spinelets are relatively longer than in the shallower water 
forms. The inner or furrow spines on the adambulacral plates are remarkable for being 
strongly channelled on the outer side, and appearing at first sight like two spines closely 
pressed together, especially at the base. 
3. Porania glaber, n. sp. (Pl. LIX. figs. 1 and 2). 
Rays five R=91 to 97 mm.,r=35mm. R> 2-757. 
Marginal contour stellato-pentagonal. Disk large. Rays moderately produced, sub 
cylindrical towards the extremity, and tapering to a point; in their present position more 
or less recurved over the disk. Interbrachial arcs wide and rounded. Abactinal surface 
convex, high and tumid when inflated. The lateral wall in the interbrachial are may be 
