Clark — New Recent Crinoids from the Indian Ocean. 81 



tliat the dorsal surface of the joints becomes V)hintly carinate. The dorsal 

 edge of the cirri presents a slightly serrate appearance. 



Ends of the basal rays visible as prominent dorso-ventrally elongate 

 tnbercles in the angles of the calyx ; radials projecting very slightly beyond 

 the edges of the eentro-dorsal; i Bri very short, band-like, above five 

 times as broad as long, convex proximally, concave distally, in close 

 lateral apposition ; i Bro (axillary) broadly pentagonal, half again as broad 

 as long, all the sides strongly concave ; the lateral edges of the two com- 

 ponents of the I Br series taken together are evenly and strongly concave, 

 the proximal width of the i Bri and the distal width of the i Br2 being 

 about the same; Iwth these joints are sharply flattened laterally, with the 

 apposed edges somewhat everted, ii Br 4 (3 -f 4), very strongly rounded 

 dorsally like the i Br, in close lateral apposition and sharply flattened, 

 the lateral edges somewhat produced; the joints of this division series are 

 proportionally rather long. 



Twenty arms about 150 mm. long, deep and compressed, strongly 

 rounded dorsally ; first brachial very short, strongly concave anteriorly ; 

 second brachial much larger with a posterior rounded process incising the 

 first; third and fourth brachials (syzygial pair) about as long as broad, 

 concave dorsally and laterally like the ii Brs 4- 4 ; following brachials to 

 the ninth wedge-shaped, half again as broad as long; following l)rachials 

 triangular, about as long as broad, in the terminal portion of the arm be- 

 coming wedge-shaped and slightly longer. After the proximal third of the 

 arm the brachials develop prominent and spinous distal ends and a striated 

 dorsal surface. Syzygies occur between the third and fourth brachials, 

 again between the fifteenth and sixteenth to nineteenth and twentieth, 

 and distally at intervals of four to nine oblique muscular articulations. 



Pxj 15 mm. long, large and stout in the basal half, then tapering to a 

 slender tip, with about twenty-five joints, the second — seventh broader 

 than long, the remainder about as long as broad; Pi 12 mm. long, with 

 twenty-three joints, much less stout than P^. the outer joints somewhat 

 spinous along their dorsal ridge ; Ps 7 mm. long, considerably more slender 

 than P2, tapering evenly from the base to the end of the proximal half, 

 slender from there onward, with sixteen joints, all but the first two ap- 

 proximately squarish; following pinnules about the same length, but 

 scarcely tapering at all until near the tip, hence appearing somewhat 

 stouter ; they are composed of about fourteen joints; distal pinnules mod- 

 erately slender, 12 mm. long with twenty joints, the first trapezoidal, 

 about twice as broad distally as its median length, the second trapezoidal, 

 somewhat broader distally than the median length, the remainder slightly 

 longer than broad ; the dorsal ridge is very sharp and more or less spinous. 



Color ( in spirits ) . — White. 



Subfamily CHARITOMETRIN.E. 



Genus PACHYLOMETRA A. H. Clark. 



Pachylometra macilenta sp. nov. 



Type.— Cat No. IG Indian Museum; 10° 47M5'^ N. lat., 72° 40^ 20^' 

 E. long. ; 705 fathoms. 



