258 THE VOYAGE OF H.M.S. CHALLENGER. 
plates is the longest and very large in the African species; in Lwedia sarsiw, on the other 
hand, the middle spine is the longest, and the size is by no means so great. The pedicellarie 
on the actinal surface are low and hemispherical in Lwidia africana, longer and pointed 
in Luidia sarstii. The colour marking—the dark thin band along the median radial line— 
is very characteristic of the form above described. 
8. Luidia sarsiz, Ditben and Koren. 
Asterias, n. sp., Sars. 1835, Beskrivelser og Iagttagelser over Dyr ved den Bergenske Kyst, p. 39. 
Luidia fragilissima (pars), Forbes, 1841, Hist. Brit. Starf., p. 135. 
Luydia Sarsii, Diiben and Koren, 1844, Ofversigt K. Svensk Vet.-Akad. Forhandl., 1844, p. 113. 
Luydia Savignyt (pars), Diiben and Koren, 1846, K. Svensk. Vetensk.-Akad. Handl., Ar 1844, p. 254, 
tab. vill. figs. 23, 24 (non Audouin). 
Localities. —“ Porcupine” Expedition : 
Station 46. 1869. Between Scotland and the Faerée Islands. Lat. 59° 23’ N., long. 
7° 4’ W. Depth 374 fathoms. Bottom temperature 7°°7 C. ; surface temperature 12°11 C. 
Station 67. East of the Shetland Islands. Lat. 60° 32’ N., long. 0° 29’ W. Depth 
64 fathoms. Bottom temperature 9°°5 C.; surface temperature 11°°0 C. 
Station 68. East of the Shetland Islands. Lat. 60° 23’ N., long. 0° 33’ E. Depth 75 
fathoms. Bottom temperature 6°°7 C.; surface temperature 11°°4 C. 
“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 53 fathoms. 
Other Localities.—British Islands; South of Norway, extending as far north as 
Christiansund. 
9. Luidia forficifer, n. sp. (Pl. XLIV. figs. 5 and 6; Pl. XLV. figs. 5 and 6). 
Rays five. R=40 mm.; r=8 mm. R=5,r. Breadth of a ray near the base, at 
the third or fourth infero-marginal plate, 9 mm. 
Rays short for the genus, rather broad, tapering from the base to the extremity, and 
rather more rapidly on the outer part of the ray, convex abactinally. Lateral margin 
subangular. Actinal surface subplane. 
The paxillee of the abactinal area are comparatively large and distinct. There are four 
regular longitudinal series at the sides of the ray, in which the paxille are larger, and 
have more or less of a square appearance. In the intermediate space the paxille are 
smaller and subrotund. On the tabulum of the larger paxille are four to seven robust 
subgranuliform papille, with a series of twelve to sixteen, or more, very short stumpy 
conical spinelets round the margin, which radiate outwardly at an angle of about 45° to 
the plane of the tabulum, and not horizontally. In consequence of the shortness, number, 
and posture of the spinelets the paxille have somewhat of a tufted or bristling appearance. 
