31U BULLETIN OF THE BUREAU OF FISHERIES. 



the pedicellaria, in line with a peripheral series of large and small hemispherical or acorn-shaped 

 granules; plates without pedicellaria? bearin;,' 1 or 13 unequal thimble-shaped or acorn-shaped spines 

 surrounded by a peripheral scries of small granules, with 2 or 3 here and there larger than the others; 

 all the aetinal Lnterradial spines shorter than the marginal. 



Madreporic body small, circular, situated slightly nearer center than midway to margin; striations 

 fine, ridges rather wide. 



Locality: Station 42.'!!l, Clarence Straits, Alaska, 206 to 248 fms., coarse sand, rocky; bottom 

 temperature 49°. 



This species is named for Dr. Harold Heath, associate professor of zoology in Stanford University. 



Hippasteria californica, new species. 



Rays 5. R = 73mm.; r = about 35 mm. R = 2r approximately. Breadth of ray at base, about 

 40 mm. 



hi.-k very broad, rather thinner than usual in this genus; rays tapering from a broad base arcu- 

 ately to a bluntly pointed extremity; interbrachial arcs very wide, shallow, and rounded; abactinal 

 surface considerably inflated, especially in the interbrachial region adjacent to margin; rays recurved, 

 and in some specimens the interbrachial arcs appearing angular from this cause. 



Abactinal surface armed with rigid upright spines and spinules much as in phrygiana, but the 

 spines rather shorter and less numerous, on some specimens scarcely more than tubercles; pedicellaria; 

 numerous, shorter and higher than in phrygiana, very broadly spatulate, with strongly denticulate 

 rims; the granules, which are fahv smooth and not very prominent in phrygiana, in this species are 

 multilid nr denticulate, very rugose in appearance, and prominent, the investing membrane being thin 

 and ineffective, as a covering; papulae numerous, vermiform, absent from a narrow interradial area. 



Marginal plates small and rather thin, irregularly oval or elliptical, longer than high except 

 at end of ray, where the two dimensions are nearly equal. Superomarginals, 12 in number from 

 interradial line to extremity of ray, confined entirely to side of body and rather inconspicuous, 

 very irregular as to shape, successive plates frequently separated by small intermediate encroaching 

 abactinal plates; each plate with a tapering blunt spine articulated rigidly to a central boss and a 

 marginal series of rugose granules, there being also 1 or 1' smooth subcorneal granules on the general 

 surface; occasionally, also, a pedicellaria just beneath the spine. Inferomarginals very similar to 

 superomarginals, of the same number, but not opposite to them; similarly armed, but the pedicellaria 

 very rare; aetinal intermediate plates encroaching and separating most of the proximal inferomarginals. 



A.dambulacral armature consisting of (1) a single blunt spine, usually considerably compressed 

 and somewhat tapering, situated on the angular furrow margin, with occasionally a shorter, similar 

 adoral companion, or, 1 or 2 very short spinelets or compressed granules on either side of the single 

 spine; ("J) on the aetinal surface a more robust, upright, tapering, blunt spine situated just external 

 to the furrow spine, and just adoral to this usually a medium-sized pedicellaria, one jaw of which 

 is broad serrate and rather deeply scoop-shaped, closing over the other, which is smaller, thicker, 

 and not hollowed out; margins of plates bordered with the peculiar rugose granules, a few of which 

 also stand on the surface. 



Aetinal intermediate areas large, 2 series of plates extending J the length of ray, and a single 

 series nearly to tip; most of the plates with a central high pedicellaria of a peculiar shape so far as this 

 genus is concerned; jaws rather thin and wide at base, abruptly narrowing into the distal portion, 

 which bends toward the other jaw anil has a truncate, serrated edge; pedicellaria' thus in form more 

 like those usual to the Goniasterinx, though much larger; plates bordered with a series of rugose 

 granules, with several of the same size on general surface, where there are besides these a number of 

 considerably larger, smoother, subcorneal granules, immersed like the rest in thin membrane. On 

 some specimens these are almost wanting, on others they are prominent and compressed, sometimes 

 subtubercular and thimble shaped. 



Mouth plates prominent actinally; furrow spines 5 or 6, considerably compressed, the inner 

 spines the larger and heavier; on actmal surface an incomplete series of three spines, parallel with the 

 furrow, usually 1 near the inner angle and 1 or L' near the outer end of the furrow series; remainder 

 of surface covered with rugose spinelets, < iften curiously compressed or pinched, with denticulate edges, 

 these forming a row on the median suture margin, and another adjacent to first adambulacral. 



