10 Clark — A Revision of TJialassometridse and Himerometridse. 



Cirri xv-xxxv, 15-25, ratlier i^mall and weak, scarcely reaching one- 

 fifth of the arm length; proximal cirrus joints (except the hasal) some- 

 what longer than the distal, but the latternever much broader than long; 

 cirri usually strongly carinate distally, rarely spiny. 



I Br and division series dorsally rounded, the synarthrial tubercles 

 sometimes slightly developed, always well separate<l laterally, the outer 

 edges of the joints furnished with more or less developed ventro-lateral 

 tubercular prominences or lateral flanges.* 



Arms 12 to ?A; first seven to nine brachials approximately oblong (the 

 first two wedge-shaped), about twice as broad as long, then becoming 

 triangular or very obliquely wedge-shaped, broader than long, and dis- 

 tally wedge-shaped, and in the terminal portion of the arm, as long as, 

 or even rather longer than, broad, though remaining moderately oblique. 



P2 the longest, stout, very stiff and spine-like, tapering to a sharji point, 

 with comparatively few joints (not over eighteen), most of which are 

 much elongated; P^ is usually somewhat shorter than P2 with more 

 numerous and shorter joints, more slender and more flexible, but it is 

 occasionally similar to P2 ; P3 usually, and often one or two of the follow- 

 ing pinnules are of the same character as P2, but of decreasing length; 

 the distal pinnules are slender, delicate, and flexible, not so long as Pg. 



Color (inspirits). — Yellow or white, with narrow bands of red-brown 

 or blackish-brown at the articulations; sometimes deep violet or almost 

 black, or yellow or reddish with darker bands at the articulations. 



Distribution. — Island of Rodriguez, eastward to the Nicobar Islands, 

 Singapore, Amboina, Torres Straits, the Banda Sea, Fiji, the Tonga 

 Islands, the Carolines, and the Philijjpines. 



Depth. — Littoral, extending downward to 21 fathoms. f 



The described species belonging to this genus are: 



Stephanometra acuta (A. H. Clark) 



" echinus (A. H. Clark) 



" indica (Smith) 



" monacantha (Hartlaub) 



" oxyacantha (Hartlaub) 



" spicata (P. H. Carpenter) 



" spinipinna (Hartlaul)) 



" tenuipinna (Hartlaul)) 



" tuberculata (P. H. Carpenter). 



•Absent in llic typo of Antedon spinnipinna; l)Ut this is evidently a very young 

 specimen. 



Note. — A second laitre .specimen of lliis species, received since the above was put in 

 type, has the lateral flanges developed as usual. 



tDr. Carpenter records S. tuberculata from 210, 'i'l.'), or filO fathoms, near Kandavu, 

 Fiji, but tlie shallowest of these Is so nnich below the lowest certain record for any 

 species of the family tliat the record nuist bo considered doulilful, on the basis of our 

 present knowledge. 



