304 BULLETIN OF THE BUREAU OF FISHERIES. 



with very much slenderer, prismatic, pointed spinelets; or the 5 to 7 or 8 robust spinelets may form a 

 central group, often in an ornate rosette, surrounded at a slightly lower level by the slender spinelets, 

 the latter standing between the heavy spinelets, however. Spinelets intermediate between the 2 sizes 

 occur on the periphery of some of the paxilke. 



Superomarginal plates, 50 in number from median interradial line to extremity of ray, much wider 

 than long, widest in interlirachial arc and forming an even bevel, which is mure arched on outer part 

 of ray; these plates covered with a very regular hexagonal granulation, which is coarser at the outer 

 lateral) end of the [date, and distinctly though not distantly spaced, a peripheral series of smaller 

 closer granules being clearly distinguishable; granulation of these plates coarser than that of the 

 paxill.e. [nferomarginals corresponding exactly to superomarginals and forming a similar border to 

 their area, covered with a coarse hexagonal granulation, which increases rapidly in coarseness toward 

 outer edge of plate, where many of tlie granules Hare at the tips ami are somewhat squamiform. In 

 the interlirachial arc the plates bear a median transverse series of 4 or 5 flattened, sharp lanceolate, 

 appressed spinelets. which becomes reduced to one beyond the middle of the ray. 



Adambnlacral plates with an angular furrow margin bearing a palmate series of 5 tapering, more 

 or less compressed spinelets, the median (or adoral admedian) the longest and most compressed; tips 

 rounded; the lateral spinelets often with Hat side uppermost; furrow series continued along adoral 

 and aboral margin of plate in :! or 4 spaced, much smaller, papilliform spinelets; on theactinal surface 

 l', or occasionally 3, enlarged, robust, pointed spinules, standing in a transverse, oblique, or longitudi- 

 nal scries, between them and the furrow series a semicircular row of :; or 4 shorter, blunt, papilliform 

 spinelets, very irregular, and on outer part of plate several smaller, clavate, spinelets; exclusive of tin' 

 furrow series about L'L' spinules and spinelets to each plate, the outermost very irregular in distribu- 

 tion, and on distal part of the ray showing a tendency to group themselves about the 2 or 3 larger 

 spinules. 



Mouth plates remarkable for their bristling armature; rather narrow, especially at tin- outer cuds, 

 and appearing quite distinct from one another; 1 enlarged tooth at inner angle of the combined plates, 

 and the 3 adjacent spinelets decreasingly graduated on either plate, the next 4 longer and subcecal, 

 the outer slightly shorter than the 4; on actinal surface a dense mass of blunt cylindrical spinelets, 



which are rather long and slender on the inner end of the plate, but short, papilliform, and clavalc 



th iter part, the one kind passing insensibly into the other; the smaller spinelets form 2 regular 



rows on the outer part of the plate, but in one interradius there are 4. 



Actinal interradial areas large, the intermediate plates extending as far as the tenth inferomar- 

 ginal; plates armed with spaced papilliform Spinelets, those in the center robust and clavate, with 

 slightly Hating tips bent outward, the peripheral smaller, round-tipped, occasionally subprismatic, 

 very unequal and irregular, ami radiating over narrow fasciolar grooves between the plates; these 

 grooves lead from the inferomarginal fascioles to those between the adambulacral plates, following an 

 irregular course. A number of scattered plates have one of the- central spinelets considerably enlarged 

 and pointed. 



Madreporic body small, situated J the distance from center to inner margin of superomarginal 

 plates; striations very irregular. 



Locality: Station 4236, near Yes May, I'.ehni Canal, Alaska, in 147 to I'd") fms., rocks, coarse sand; 

 bottom temperature, 41'. 8°. 



This species is characterized by well-developed post-adambulacral fascioles. It is probably most 

 nearly related to Pseudarchaster preliosm (Doederlein) from .Japan (Tokyo ami Sagami bays 20-30 



meters) and may prove identical when a < parison of specimens is made. The original description 



(Zool. Anz. 1902, 326) is rather too short and incomplete to determine details of ornamentation. 



Pseudarchaster pusillus, new species. 



Mays 5. R = 32mm.; r = 14.5mm. R = 2.2r. Breadth of ray at base, 17.5 mm. A prevalent 

 variation has still shorter rays: R = 28mm.; r = 15mm.; and another R = 29 mm. ; r=17mm. R = 

 respectively 1.86 r and 1.7 r. In the last specimen, breadth of ray at base = is. 5 mm. 



This species differs from the foregoing in having shorter and broader rays, larger disk, smaller 

 paxilkfi, which, instead of being crowded, are distinctly spaced, giving an open appearance to the 

 abactinal area; conspicuous papula-; much narrower and less numerous superomarginal plates, which 



