200 ECHINODERMA OF THE INDIAN MUSEFM, PART VII. 



Cirri XX, about 70 (69 to broken tip), sr> mm. long, large and stout : first 

 three segments subequal, about three times as broad as long, fourth slightly longer, 

 fifth squarish or slightly longer than broad, the following segments about one 

 third longer than broad, after the eighteenth becoming squarish, and after four 

 or five more about twice as broad as long ; eighteentli a transition segment ; 

 after the transition segment the dorsal surface of each segment gradually rises 

 to a subterminal dorsal tubercle, which, however, never projects in the form of 

 a spine ; the tubercle is at first rather broad transversely and rounded dorsally , 

 but distally it becomes narrower so that the dorsal surface of the segment be- 

 comes bluntly carinate. Viewed laterally the dorsal profile of the cirri presents 

 a slightly serrate appearance. 



Ends of the basal rays visiblfe as prominent dorsoventrally elongated tuber- 

 cles in the angles of the calyx ; radials projecting very slightly beyond the edges 

 of the centrodorsal ; IBr, very short, band-like, about five times as broad as 

 long, convex proximally, concave distally, in close lateral apposition; IBr.j 

 broadly pentagonal, half again as broad as long, all the sides strongly concave; 

 the lateral edges of the two components of the IBr series taken together are 

 evenly and strongly concave, the proximal width of the IBr, and the distal width 

 of the IBij being about the same ; both these segments are sharply flattened 

 laterally, with the apposed edges somewhat everted. IIBr 4 (3-)- 4), very strongly 

 rounded dorsally like the IBr, in close lateral apposition and sharply flattened, 

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

 proportionately rather long. 



Twenty arms about 150 mm. long, deep and comjiressed, 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 IIBr 3 + 4 ; following brachials to the ninth wedge-shaped, half again 

 as broad as long; following brachials triangular, about as long as broad, in 

 the terminal portion of the arm becoming 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 sixteentli to nineteenth and 

 twentieth, and distally at intervals of from four to nine oblique muscular articu- 

 lations. 



Pd 15 mm. long, large and stout in the basal half but tapering to a slender 

 tip, with about twenty-five segments, the second-seventh broader than long, the 

 remainder about as long as broad; P, 12 mm. long with twenty-three 

 segments, much less stout than Pd , the outer segments somewhat spinous along 

 their dorsal ridge; P3 7 mm. long, considerably more slender than P.^,. tapering 

 evenly from the base to the end of the proximal half, slender from there out- 

 ward, with sixteen segments all but the first two of which are approximately 

 squarish ; following pinnules of about the same lengtli but scarcely tapering at 



