JAPANESE ASTEROIDEA. 349 



distinguislicd from it by the narrower arms, the mammiform 

 character of many of the main plates, the adambulacral armature 

 and the form of the marginal plates. 



JJippasteria sjHnosaf VEERn:,L. 



This species was first described by VerrHuL as follows [ : 09, p. 63] : 



"Very similar in form aud size to //. pJirygiana of the N. Atlantic, 

 but thickly covered with large, tapering, acute spines, usually one to nearly 

 every dorsal plate and 1 to 3 on each marginal. Many of the plates also 

 have large elevated bivalve f)edicellari8e, but not so wide as in plirygiana. 



"Departm-e Bay, British Columbia, 18 fath. (H. C. Young), Canada 

 Geol. Survey; Puget Sound (Prof. Kincaid)." 



It has recently been described minutely by Fisher as follows [ :11, p. 

 224, G figs.] : 



" Diagnosis. — Similar to H. 'plirygiana of the North Atlantic, but 

 primary abacbinal and marginal jplates with jjrominent, often long, tapering 

 blunt spines rather than the elongate tubercles of 'plirygiana. 



" Description.— FvSbjs five. E = 110 mm. ; r = 56mm. ; R = 2 r. Breadth 

 of ray at base, 64 mm. General form same as plirygiana, but rays a trifle 

 broader. Majority of the larger or primary abactiual jDlates convex and bear- 

 ing in centre a stout, Tipright, rigid, tapering truncate spine, one to two 

 times width of its plate in length ; midradial spines sliglitly the longest, thence 

 decreasing in length to margin of area ; same plates in plirygiana bearing 

 a very much shorter, stouter tubercle, truncate or rounded at apex. 

 General surface of plates smooth, but rim encircled by a single series of 

 irregular, small, subcortical or roundish gi-anules heavily invested Avitli mem- 

 brane. Many large and smaller plates bear a large central bivalved 

 pedicellaria, the jaws of wliich are only slightly wider than high ; sometimes 

 the two dimensions are equal. These pedicellariœ are usually naiTOwer and 

 Idgher than those of plirijgiana, and have thinner blades. Distal edge of 

 jaws is slightly cm-^'ed, either senute or smooth. Small intermediate plates 



