NO. 1673. RECENT CRIN0TD8 FROM THE PHILIPPINES— CLARK. 401 



grooves reach the mouth ; brachial ambulacra naked ; pinnule ambu- 

 lacra with small but well developed side and covering plates. 



Ends of the basal rays visible as small tubercles in the angles of 

 the calyx ; radials short, of approximately uniform width all around 

 the calyx, slightly convex proximally and correspondingly concave 

 distally ; I Br^ oblong, three times as broad as long, in close apposi- 

 tion laterally, with an indicated broad rounded median keel; I Br, 

 broadly pentagonal, two and one-half times as broad as long, the lat- 

 eral edges about half as long as those of the I Br^, in close lateral 

 apposition and sharply flattened; II Br 2, resembling the I Br, but 

 l^roportionately slightly longer, with the same indicated broadly 

 rounded median keel, sharply flattened laterally and in close apposi- 

 tion. 



Twenty arms 100 >mm. long; first two brachials slightly wedge- 

 shaped, about twice as broad as long, sharply flattened and in close 

 apposition exteriorly, the first closely united interiorly, the second in 

 close apposition and flattened interiorly; third and fourth brachials 

 (syzygial pair) oblong, about one-third broader than long; next four 

 or five brachials oblong, about three times as broad as long, then be- 

 coming w^edge-shaped, and after the twelfth or fifteenth triangular, 

 two and one-half times as broad as long, in the terminal part of the 

 arm wedge-shaped again and slightly longer, the arm ending abruptly 

 with six or seven very small and short brachials, and curving inward 

 between the terminal pinnules, which exceed the arm in length by 

 4 mm, ; arms broadly convex dorsally in their basal portion (the first 

 seven or eight brachials sharply "wall-sided"), very gradually be- 

 coming narrower, and distally strongly carinate ; at about the twelfth 

 or fifteenth brachial a broadly rounded median keel begins to be 

 indicated; this gradually narrows distally, and on the twentieth to 

 the twenty-fifth the median portion of the distal edge begins to be 

 slightly prominent; this increases slowly in extent at the same time 

 narrowing, so that brachials in the outer half of the arm are bluntly 

 carinate, with the median portion of the distal edge produced, and in 

 the terminal portion sharply carinate, with prominent overlapping 

 spines. 



Pi 8 mm. long, strongly prismatic, slightly less stout than the 

 succeeding pinnules, with sixteen joints, the first short, the second and 

 third squarish, the remainder very slightly longer than broad, be- 

 coming about one-third again as long as broad distally. P, 12.5 

 mm. long, with nineteen joints, the first twice as broad as long, the 

 second squarish, the remainder very slightly longer than broad; the 

 more distal joints exhibit a tendency toward a slight production 

 of their distal edges at the prismatic angles; the terminal three or 

 four joints taper rather more rapidly than usual. P3 14 mm. long, 

 with seventeen joints, the first twice as broad as long, the second squar- 

 Proc. N. M. vol. XXXVI— 09 26 



