258 THE VOYAGE OF H.M.S. CHALLENGER. 



plates is the longest and very large in the African species ; in Luidia sarsii, on the other 

 hand, the middle spine is the longest, and the size is by no means so great. The pedicellarise 

 on the actinal surface are low and hemispherical in Luidia africana, longer and pointed 

 in Luidia sarsii. The colour marking— the dark thin band along the median radial line- 

 is very characteristic of the form above described. 



8. Luidia sarsii, Duben and Koren. 



Asterias, n. sp., Sars. 1835, Beskrivelser og Iagttagelser over Dyr ved den Bergenske Kyst, p. 39. 

 Luidia frag ilissima (pans), Forbes, 1841, Hist. Brit. Starf., p. 135. 



Lwjdia Sarsii, Duben and Koren, 1844, Ofversigt K. Svensk Vet.-Akad. Forhandl., 1844, p. 113. 

 Luydia Savignyi (pars), Diiben and Koren, 1846, K. Svensk. Vetensk.-Akad. Handl., Ar 1844, p. 254, 

 tab. viii. figs. 23, 24 (von Audouin). 



Localities. — "Porcupine" Expedition : 



Station 46. 1869. Between Scotland and the Faerbe Islands. Lat, 59° 23' N., long. 

 7° 4' W. Depth 374 fathoms. Bottom temperature T'l C. ; surface temperature 12°'l 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 ll°"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 forjicifer, n. sp. (PI. XLIV. figs. 5 and 6 ; PI. 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. 



\i The paxillse of the abaetinal area are comparatively large and distinct. There are four 

 regular longitudinal series at the sides of the ray, in which the paxillse are larger, and 

 have more or less of a square appearance. In the intermediate space the paxillse are 

 smaller aud subrotund. On the tabulum of the larger paxillae are four to seven robust 

 subgranulifonn papillae, 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 paxilke have somewhat of a tufted or bristling appearance. 



