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



5. Luidia ciliaris (Philippi), Gray. 



Asterias rubens, Johnston, 1836, Loudon's Mag. Nat. Hist., vol. ix. p. 144, fig. 20 (won Linn6). 



Asterias ciliaris, Philippi, 1837, Archiv f. Naturgesch., Jahrg. iii., Bd. i. p. 193. 



Luidia frag ilissima (pars), Forbes, 1839, Mem. Wern. Soc. Edin., vol. viii. p. 123, tab. 3, fig. 8. 



Asterias pectinata, Couch, 1840, Charlesworth's Mag. Nat. Hist., vol. iv. n.s. p. 34. 



Luidia ciliaris, Gray, 1840, Ann. and Mag. Nat. Hist., vol. vi. p. 183. 



Asterias imperati, Delia Chiaje, 1841, Descr. e Not. degli anim. invert, della Sicilia citeriore, vol. iv. 



p. 57 ; voL v. p. 123, tav. 135, figs. 1, 3, 4 ; tav. 171, fig. 25; tav. 172, fig. 8. 

 Luidia Savignyi (pars), Muller and Troschel, 1842, System der Asteriden, p. 77 (mm Audouin). 



Locality.— "Triton" Expedition : 



Station 3. In the Faeroe Channel. August 8, 1882. Lat. 60° 39' 30" N., long. 9° 6' 

 0" W. Depth 87 fathoms. Bottom temperature 49° "5 Fahr. 



Other Localities. — British Islands, East Atlantic as far north as the Cattegat, coast of 

 France, Mediterranean. 



6. Luidia longispina, n. sp. (PL XLIII. figs. 3 and 4 ; PI. XLV. figs. 3 and 4). 



Pays five. R = 56 mm. ; r = 8 mm. R = 7 r. Breadth of a ray at the third infero- 

 marginal plate, 9 mm. 



Rays elongate, depressed, slightly convex abactinally ; slightly constricted at their 

 junction with the disk, then faintly inflated, and afterwards tapering gradually up to the 

 extremity. Lateral margin more or less angular. Actinal surface slightly convex. 



The paxillse of the abactinal area are delicate, distinct, and widely spaced ; rather 

 smaller and more crowded along the median radial line. Three or four regular longi- 

 tudinal series at the sides of the ray. The larger paxillse are composed of a marginal 

 series of about a dozen very delicate spinelets, shorter than the diameter of the tabulum, 

 from the edge of which they radiate horizontally ; and three to five small spinelets on the 

 centre of the tabulum, usually shorter and more robust than the marginal series. Occasional 

 paxillse, here and there, bear a single two-valved, fully developed pedicellaria usually 

 placed at the margin of the tabulum. The pedicellaria is often of greater length than the 

 spines there, and has quite a massive appearance in comparison with their delicacy. 



The infero-marginal plates have a narrow and very prominent median keel, and the 

 intervening fasciolar furrow between neighbouring keels is wide and well furnished with 

 delicate cilia-like spinelets. On the ridge are borne three spinelets, at least on the inner 

 half of the ray, subequally spaced, and placed one behind the other, forming a transverse 

 lineal series in relation to the axis of the ray. The outermost spine, which stands at the 

 margin of the ray, is long, delicate, cylindrical, tapering and sharply pointed, and with a 

 very slight geniculation near the base. These spinelets are directed horizontally and at a 

 slight angle outward, and form a very conspicuous fringe along the margin of the ray. 

 The longest spines are about 5 mm., and are the ninth or tenth from the base, the spines 



