Clark — A^ew Recent Indian Crinoids. 147 



While in general similar to Asteromelra longicirra, this species may be 

 at once distinguished l)y the presence of a high sharp median keel on the 

 I Br series and on the tirst two brachials. 



Asterometra acerba sp. nov. 



Antedon longicirra (part) (not of Carpenter) 1893. Belt,, Jonrn. Linn. 

 Hoc. (Zool.), vol. 24, p. 3.",9. 



Type.—CAt. No. *V-, Indian Museum; Sahul Bank, in 10° 30^ S. lat., 

 125° E. long. ; collected by Capt. F. Worsley of the cable S. S. Sherard 

 Osbnrn. 



In general this species comes nearest to .1. nnihus of the Eastern Sea, 

 but it is a more slender species and possesses ten arms only. 



Cirri xx, 84-90, 55 mm. long, more slender than those of A. anthus. 



Radials with a moderately prominent dorso-ventrally elongate median 

 tubercle; i Br series with a faint narrow low median carination. 



Ten arms 80 mm. long, slightlj^ more slender than those of A. anthns, 

 with slightly longer brachials; arms strongly compressed distally as in 

 that species, but the overlapping spines developed on the brachials are not 

 nearly so long or stout. 



Pinnules much longer than those of .1. nuthns, and more slender, with 

 proportionately longer joints, those in the terminal portion being three 

 times as long as broad or even longer whereas in .4. anthus they do not 

 exceed twice the length: Pi is 7 mm. long with twelve joints; P2 similar, 

 7.5 mm. long; P3 slightly stouter 8 mm. long; Ps 9 mm. long; distal pin- 

 nules 13 mm. long. 



Family THALASSOMETRID.E 



Sub-family THALA.SSOMETRIN.E. 



GF.^aTS CROTALOMETRA A. H. Clark. 



Crotalometra sentifera sp. nov. 



Tt/pe.-CAt. No. Z. E. \'. ^-^S Indian Museum; 10° 47M5'^ N. lat., 

 72° 40' 20'^ E. long. ; 703 fathoms. 



This new form is most nearly related to C. magnicirra and C. rustica ; 

 while of the same arm length or even somewhat larger than the latter 

 ( 150 nun. to 1(30 mm. arm length) it is more slender, the arms are fewer 

 in number ( twelve to sixteen), the cirri are shorter and less stout with fewer 

 joints (xx, 59-62, 50 mm. long), and the brachials after the proximal 

 third of the arm bear long overlapjiing spines which are more or less flat- 

 tened dorso-ventrally and rounded or truncated at the tip. 



<;F.Nrs TIIALASSOMETRA A. II. flark. 



Thalassometra attenuata sj). nov. 



Type.—C&t. No. Z. E. V. ^'V'J-, Indian Museum; 22° 24^0" N. lat., 

 66° bV W E. long. ; 765 fathoms. 



This very slender species appears to be related to T. pergracilis, but is 

 much more delicate even than that species. 



