80 Clark — Neiv Recent Crinoids from the Indian Ocean. 



tlio rounded apex of which entirely separates the bases of the i Bri; i Bri 

 shghtly trapezoidal, about twice and one-half as broad as long, the ventro- 

 lateral margins very thin ; i Bro (axillary) pentagonal, as long as, or only 

 slightly shorter than, broad, the lateral edges nearly or quite as long as 

 those of the i Bn, slightly constricted just below the lateral angles; ii Br 2, 

 the first united in the proximal two-thirds, diverging at approximately a 

 right angle distally. 



Nineteen arms (in the tyjie) l.'>0 mm. long, resembling in the main 

 those of C. multicolor. 



Pi 10 mm. long, very slender and weak, with thirty-five joints, the 

 first proportionately very much enlarged, twice as broad as long, with a 

 strong carinate process, the second much shorter, strongly trapezoidal, 

 the remainder very small and squarish ; P2 somewhat longer, but stitt" 

 and spine-like, with elongated joints like Ps; Ps 20 nmi. long, not espec- 

 ially stout l)ut very stiff, with about twenty joints, the first aboTit twice as 

 broad as long, slightly carinate, the second trapezoidal, aliout as broad 

 distally as the proximal length, the third half again as long as broad, the 

 fourth over twice as long as broad, the remainder two and one-half to 

 three times as long as broad and even longer distally ; the joints have 

 slightly projecting and spinous distal ends, this character increasing in 

 intensity distally ; P4 similar to P3 and of the same length ; the following 

 pinnules decrease to 12 mm. on Pe, then become somewhat stouter, and 

 more slender again distally, though remaining of the same length ; the 

 joints in the distal portion of all the pinnules have prominent, somewhat 

 expanded, spinous distal ends. The pinnules on the outer arms of each 

 ray appear to be considerably longer than those on the inner. 



Color (in spirits.) — White, thickly blotched on the rays, arms, and 

 pinnules with ])urple, which color also forms on the rays and division 

 series a more or less defined dorso-lateral line. 



Family THALASSOMETRID^. 



Subfamily THALASSOMETRIN.E. 

 Genvs CROTALOMETRA a. II. Clark. 



Crotalometra rustica sp. nov. 



Type.— Cixi. No. 19A = -»-V- Indian Museum; Malay Archipelago, oO 

 fathoms. 



Centro-dorsal apparently as in C. magnicirra, with the cirrus sockets 

 arranged in ten columns, two in each radial area. 



Cirri xx, about 70 ((i!) to broken tip), 85 mm. long, large and stout; 

 first three joints subequal, about three times as broad as long, fourth 

 slightly longer, fifth squarish or slightly longer than broad, following 

 joints about one-third longer than broad, after the eighteenth becoming 

 squarish, ami after four or five more about twice as broad as long; eigh- 

 teenth a transition joint; after the transition joint the dorsal surface of 

 each joint gradually rises toasul)terniinal dorsal tubercle, which, however, 

 never projects in the f<jrm of a spine; the tubercle is at first rather broad 

 transversely and rounded dorsally, but distally it becomes narrower, so 



