ASTEROIDEA OF NORTH PACIFIC AND ADJACENT WATEBS FI8HEB. 359 



mouth spines are seven. However, it may be stated that the character of the oral 

 armature, |)a.\ilhv. an<l sii[)railorsal memhiane of the Beriug Si-a specimens afjroes 

 fairly well with Sars' diagnosis and figures. 



PTERASTER MULTISPINUS Ctalk. 



Pterasur muUispinus Claek, Proc. Bost. Soc. Nat. llist., vol. 29, No. 1.5, May, 1901, p. 326, pi. 

 3, figs. 1 and 2.— Fisheh, Auu. and Mag. Nat. Hist., ser. 8, vol. .'>. Vvh , 1!H0, p. IWJ. 



Description. — Rays five. R = 27 mm.; r= IS mm.; R= 1.5 r. Breadth of raj 

 at base, 17 mm. Interbrachial arcs rather .sliallow. Disk almost flat, 10 mm. 

 high, the rays not dearly marked off. Abactinal .surface of rays almost fiat ; actinal 

 surface flat, edges rounded. Supradorsal membrane tiiick, stout and apparently 

 muscular with no signs of reticulations. Spiracula seem to be absent on disk, but 

 abundant near tips of rays. Pa.xillap iiigh witii numerous spines (eiglit to ten or 

 more), those in the middle little more slender than tho.se on edge of paxilla. On 

 account of the abundance of paxilljc spines, it is almost impossible to determine 

 whether the membrane contains any other calcareous bodies or not, but there 

 seems to be none. Oscular orifice large, surrounded by long spines imbedded in 

 the membrane. Ambulacral furrows broad; feet in two rows. Adambulacral 

 plates with six spines arranged in a row at right angles to furrow and united by a 

 delicate membrane. The outermost spine is clearly united to the fifth by this 

 membrane, and each series of spines is nnited b}/ this membrane to the edge of the 

 supradorsal membrane (italics mine). Between each pair of outermost spines is a 

 small sharp spine, the aperture papilla, which is nearly free on both sides. Mouth 

 plates prominent, each with three marginal spines united by a delicate membrane, 

 and with a very large free, superficial spine, placed near the base, and pointing 

 downward and backward. Color in alcohol, grayi.sh pink-purple. (Clark.) 



Remarks. — The type, originalh' at Columbia I'niversity, New York, seems to 

 have been misplaced. At least its whereabouts was not known in January, 1910. 

 The specimen was collected by a party from Cohimi)ia I'niversity, presumably at 

 Puget Sound, 1807. \othing further is known of the species. 



No mention is made in the descrii)tion of an actinolateral membrane, wluch is 

 therefore probably very narrow. The italicized |>ortion of the above description 

 woulil seem to indicate as much. As no lateral fringe is mentioned I am not cer- 

 tain wiu'thcr tills is present. 



PTERASTER TESSELATDS Ives. 



PI. 104, tigs. I-.). 



Pteraslcr Ifsselattis IvF.8, Proc. Acad. Nat. Sci. Phila., 18S8, p. A2\ (Kiidiak I.'<land). 



Diagnosis. — General form very broadly stellate, as, for instance, R = 88 mm., 

 r=54 mm., R= 1.6.3 r (station 4222); disk high, rays short and thick, with straight 

 or swollen sides and recurved blunt tip; interbrachial arcs angular broad; supra- 

 dorsal membrane thick, spongy, marked by reticulations inclosing numerous small 

 spiracula; spinelets not protruding as a rule; paxilla s|)inelet3 eighteen to twenty- 

 six, the six or seven |)erii)lieral stouter, and slightly longer than pedicel; actino- 



