212 BULLETIN 76, UNITED STATES NATIONAL MUSEUM. 



the furrow spinclets as in Mediaster, and consisting of three or four compressed, 

 square-tipped, sharp-edged granules, larger than those of the outer series. These 

 are very irregular in distribution, eight or nine in number, and similar to, but a 

 trifle larger than the actinal intcimediate granules, wluch they resemble but are 

 usually less regular in form. There are sometimes two irregular rows of these 

 smaller outer granules. At adoral end of inner actinal series is a pedicellaria with 

 two broadly spatulatc jaws, slightly larger than the granules of the series, wliich 

 the pedicellaria greatly resembles when the jaws are closed; at tip of "ray" there 

 are four to seven sjiinelets in the furrow series, and on the actinal surface a blunt, 

 prominent tubercle, surrounded by several granules, tliis tubercle grading into the 

 granules of the inner actinal series. The pedicellaria persists to within tw^o or three 

 plates of the tip. 



Mouth plates triangular, with a longer furrow margin than the edge adjacent 

 to first adambulacral ; furrow series consisting of ten to tliirteen spinelets similar 

 in character to those of adambulacrals, but increasing in size toward inner angle, 

 where there is an oblanceolate, blunt, flattened, or compressed tooth, the other 

 spinelets square in section or slightly compressed. On actinal surface is a Unear 

 series of low, squarish granules adjacent to the median suture, several others along 

 the aboral edge, and two or three intermediate between the superficial and marginal 

 series. 



Actinal inteiTadial ai-eas very extensive; intermediate plates quadrate, 

 roundish, or irregular, those adjacent to the adambulacrals much larger than any 

 of the others, and usually oblong in shape, the short end toward furrow. The 

 plates are arranged in rows parallel to furrow, considerable irregularity existing. 

 Plates are covered with numerous uniform, hemispherical, bead-like granules dis- 

 tinctly spaced. Pedicellariae similar to those of adambulacral plates scattered 

 here and there, especially near the furrow, but their numbers subject to great 

 variation. They are not so numerous as in C. japonicus. The appearance of the 

 spaced, round, bead-like granules is strikingly different from the crowded, flat, 

 polj^gonal granulation of these areas in C. japonicus. 



Madreporic body unsymmetrically pentagonal, larger than any of the plates, 

 situated one-third distance from center to margin. It is slightly convex and has 

 brandling ridges radiating from an eccentric point. 



Color in life, vermiUon, yellowish on actinal surface. 



Anatomical notes. — The internal anatomy is veiy similar to that of C. japonicus. 

 The intestinal coecum, in the specimen examined, is large with four principal divi- 

 sions, two of wliich are divided at the end. The gonads form a series, on either side 

 of, and parallel to the interradial septum. There are five to eight tufts in each 

 series. The dorsal muscles are arranged as in C. japonicus but are much weaker. 



Variations. — The variations in this species parallel to a considerable degree, 

 those of C. japonicus. The general shape ranges from a nearly straight-sided 

 pentagcm (R = 1.31 r) to very broadly stellate (R = 1.5 to 1.73 r) the latter being 

 young specimens ; there are also pentagonal examples among the young. The tabula 

 of the abactinal plates arc broader on the radial areas of some examples; corre- 

 sponding to tliis, the typically wide spaces between the tabula are narrower. The 

 tabula of the radial area are sometimes less regular in form, being nearly elUptical. 

 In young specimens the secondary intermediate ])lates of the abactinal radial 



