NO. 1820 RECENT CRIXOIDS FROM PHILIPPINES — CLARK 223 



Centro-dorsal hemispherical or thick discoidal, a large convex 

 polar area bare, the cirri marginal, arranged in two closely crowded 

 rows. 



Cirri x-xv, 26-40 (usually 34-36) ; first joint short, the following 

 becoming progressively longer to the fourth or fifth, which is squar- 

 ish, then remaining similar to about the end of the proximal third of 

 the cirrus, after which the length gradually decreases; from the 

 twelfth or fourteenth onward prominent blunt dorsal spines are 

 developed ; opposing spine rather small, the apex opposite the end of 

 the penultimate joint, the spine arising from the entire dorsal surface 

 of that joint. 



Radials usually concealed by the centro-dorsal, but sometimes par- 

 tially visible in the interradial angles ; first costals short and band- 

 like, in lateral apposition, the dorsal surface coarsely rugose, the 

 edges crenulate or more or less dentate ; costal axillary triangular, 

 about twice as broad as long, the dorsal surface rugose, the edges 

 finely crenulate ; distichals 2, resembling the costals, and, like them, 

 in close lateral apposition. Fifteen to twenty arms ; first brachial 

 wedge-shaped, longer outwardly than inwardly, in close apposition 

 interiorly, the edges sharply crenulate or dentate ; second brachial 

 similar; third and fourth brachials (syzygial pair) roughly oblong, 

 not quite twice as broad as long; next three brachials oblong, rather 

 more than twice as broad as long, then becoming more and more 

 wedge-shaped, after about the twelfth becoming triangular, broader 

 than long, then very gradually becoming wedge-shaped again and 

 increasing in length, though even distally the joints are never quite 

 so long as broad ; arm terminating very abruptly with three or four 

 minute joints, beyond which the terminal pinnules extend for about 

 3 mm. Syzygies occur between the third and fourth brachials, again 

 between the thirteenth and fourteenth to seventeenth and eighteenth 

 (in undivided arms usually also between the ninth and tenth), and 

 distally at intervals of four oblique muscular articulations. 



The pinnules are essentially like those of C. flavopnrpurea. 



Measurements. — Arms 60 mm., cirri 20 mm. to 25 mm. in length. 



Color (in spirits). — Bright yellow, the calyx, division series, and 

 cirri white. One specimen has a narrow dull purple band crossing 

 the arms, at the first syzygy, and another has indistinct dull purplish 

 blotches on the pinnules. 



Type. — Cat. No. 25445, U. S. N. M., from Albatross Station No. 

 5167; off Simonor Island (Tawi Tawi group); no fathoms. 



This species is readily distinguishable from C. Havopurpurea by 

 the absence of the sharp median keel on the costals, and the strongly 

 dentate or sharply crenulate edges of those joints. 



