ASTEROIDEA 125 



the arcs are iiicoinpletc, with 4-6 spmes of 6-8 mm. length on 

 each side of arm. They are invested in thick membranous 

 sheaths crowded with minute crossed pedicellaria^. Adambu- 

 lacral plates, each with a single spine 4-5 mm. long, directed down- 

 wards ; it is compressed m its outer part, truncate, chisel-like. 

 On account of the shortness of the adambulacral plates these 

 adambulacral spines form a rather close fringe along each side 

 of the adambulacral furrow. No true furrow spines. Colour 

 in life unknown. R=ca. 15 r. 



Biology and development unknown. 



Hitherto known with certainty only from the Faroe Channel. 

 60° 7' N., 5° 21' W., 900 m. ; bottom temp. 1-1° C. (" Light- 

 ning ") ; 60° 6' N., 8° 14' W., ca. 790 m. ; bottom temp. 5-5° 

 C. (" Porcupine "). 



2. Brislnga Asbjornsen. 

 Arms numerous (10-13), not coalesced at their base. Dorsal 

 skeleton of arms in the shape of raised arches or ribs, bearing 

 small spinelets. Along the sides of the arms a single series of 

 verv long, slender spines. No papulae on disk or arms. Genital 

 organs small, in a series along each side of arm. Jaws not 

 laterally widened so as to close the ambulacral furrow from the 

 mouth space. First pair of adambulacral plates joining m the 

 interradial mid-line. 



Only one species, Br. endecacnemos Asbjornsen, known from 

 the British seas, but possibly another may be found there, 

 namely Br. hirsuta Perrier, found at 44° 7' N., 10° 16' W., 2030 m. 

 ( " Talisman "). It is very imperfectly known ; only a pan- of 

 small arm fragments have been found. It is characterised 

 by having numerous arcs, one to each adambulacral plate, 

 set with a close series of pointed spinelets, among which are 

 scattered large pedicellarise. In the proximal part of the arm 

 these spines cover the whole surface, the arcs being indistinct. 

 It is uncertain whether this species belongs to Brismga or 

 Brisingella. 



1. Brisinga endecacnemos Asbjornsen . (Fig. 73.) 

 Arms almost constantly 11. The raised arches numerous, 

 20-30, continuing to about the middle of the arm or even a little 

 beyond, each set with a series of very small spinelets. There is 

 an arch only to every second or thkd adambulacral plate. The 

 skin between the arches set with similar small spinelets, attached 

 to small, isolated plates. Madreporite elevated, partly covered 



