1894. PROCEEDINGS OF THE NATIONAL MUSEUM. 269 



of moderate size, more or less alternate, spiniferous; those of the 

 up]>er series smaller than those of the lower, rounded, with a central 

 eminence bearing a single large movable spine, with a group of small 

 spinules around its base. The plates of the lower series may bear two 

 or more similar large sjHues surrounded by spinules. The upper mar- 

 ginal plates form a narrow margin along the rays. 



The dorsal surface is covered with small, unequal plates in the form 

 of protopaxillai and spinopaxill.ne; the latter have a low, rouud column 

 and bear a large, central, articulated spine surrounded at base by a 

 circle of small spinules; they are found on the disk and along the 

 median iiart of the rays. The protopaxillne are smaller and part of 

 them bear only small spinules; others have a small central spine. 



The papulae cover most of the disk and the entire basal part of the 

 rays. 



Peculiar double pectinate pedicellariie exist on the dorsal surface of 

 the rays and disk, and a single one, of larger size, occupies the center 

 of each actinal interradial area; in one case a similar structure re- 

 places the two upper marginal plates in the interradial angle. These 

 large actinal compound pedicellarite may have ten to twelve incurved 

 papillfe on each side, while those of the dorsal surfaces have, usually, 

 three to six. Some of the latter have three convergent groups of 

 curved papilla?. The central dorsal pore is very evident and sur- 

 rounded by papilla?. 



The adambulacral plates have a salient inner angle, and bear a diver- 

 gent group of furrow-spines and a transverse actinal row of long 

 spines. 



The jaw-plates are large, and bear simple marginal and actinal series 

 of long spines. 



The type {Acantharchaster daicsoni, Terrill), originally described* 

 as Archaster dawsoni, Verrill, was taken in 111 fathoms ofi' the Queen 

 Charlotte Islands. 



Family STiCHASTERiD^,Perrier. 

 NEOMORPHASTER FORCIPATUS, uew species. 



Rays five, high and rounded at the base, tapering rather rapidly to 

 the slender, acute tips, and in the dry specimen showing a distinct, 

 elevated median row of large plates and four lateral rows of some- 

 what smaller j)lates on each side. Interbrachial angles subacute; disk 

 rather small, swollen, in the dry specimen depressed in the center. 

 The lesser to the greater radii are about as one to five. Smaller 

 radius of the type specimen, 10 ram. ; greater radius, 85 mm. ; breadth of 

 arms at base, 19 mm. ; height of the arms at base, 10 mm. ; diameter of 

 madreporic plate, 4 mm. 



The disk and the principal rows of dorsal plates of the rays are 



* Report of Prog., Geol. Survey of Canada, 1878-1879. 



