582 THE VOYAGE OF H.M.S. CHALLENGER. 
slightly oblique. On the margin of the adambulacral furrow, at the base of the innermost 
adambulacral spine, may be one or more small sessile, triangular, forficiform pedicellarie, 
not larger than the forcipiform pedicellarize on the abactinal and lateral areas. 
There is a longitudinal series of plates immediately external to the adambulacral 
plates, which bear a single spinelet a shade larger than those on the abactinal plates and 
numerous forcipiform pedicellariz ; the spinelets form a regular longitudinal row along 
the ray. At the base of the ray the innermost four or five spinelets may be longer than 
any of the others. Separated from these plates (? the representatives of infero-marginals) 
by a wide space occupied by numerous forcipiform pedicellarize, a second but much less 
clearly defined longitudinal series of plates may be indistinctly traced, which are perhaps 
the representatives of supero-marginal plates, but differ in no way either in superficial 
character or armature from the abactinal plates generally, except that they sometimes 
bear two spinelets side by side. 
The madreporiform body, which is large and placed near to the margin, is surrounded 
by a circlet of spinelets. The striations upon its surface are rather coarse and not much 
convoluted. 
Colour in alcohol, a bleached yellowish white. 
Locality.—Station 50. South of Halifax, Nova Scotia. May 21, 1873. Lat. 42° 8’ 
0” N., long. 63° 39’ 0” W. Depth 1250 fathoms. Blue mud. Bottom temperature 38°°0 
Fahr. ; surface temperature 45°°0 Fahr. 
Remarks.—Asterias (Hydrasterias) ophidion is distinguished by the six long worm- 
like rays; by the delicate, wide-meshed quadrate network of the abactinal area; by the 
few and isolated spinelets ; by the isolated pedicellariz ; and by the diplacanthid armature 
of the adambulacral plates. 
K. Asterias miillert group: Subgenus LEPTASTERIAS. 
15. Asterias (Leptasterias) miilleri, Sars, sp. 
Asteracanthion Muilleri, Sars, 1844, Archiv f. Naturgesch., Jahrg. x., Bd. i. p. 169; Fauna Litt. 
Norvegix, 1846, Iste Hefte, p. 56, tab, 8, figs. 38, 39; Oversigt af Norges Echinodermer, 
Christiania, 1861, p. 88. 
Asterias Miilleri, Norman, 1865, Ann. and Mag. Nat. Hist., ser. 3, vol. xv. p. 127. 
Leptasterias Miilleri, Verrill, 1866, Proceed. Boston Soc. Nat. Hist., vol. x. p. 350. 
Localities, —“ Porcupine” Expedition : 
Station 67. East of the Shetland Islands. Lat. 60° 32’ 0” N., long. 0° 29’ 0” W. 
Depth 64 fathoms. Bottom temperature 9°°5 C.; surface temperature 11°-0 C. 
Station 68. East of the Shetland Islands. Lat. 60° 23’ 0” N., long. 0° 33’ 0” E. 
Depth 75 fathoms. Bottom temperature 6°°7 C.; surface temperature 11°-4 C. 
Station 82. In the Faerde Channel. Lat. 60° 0’ 0” N., long. 5° 13’ 0” W. Depth 
312 fathoms. Bottom temperature 5°2 C.; surface temperature 11°'2 C. 
