Vol. 33, pp. 21-22 July 24, 1920 



PROCEEDINGS 



OP THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW UNSTALKKD CRINOID FROM THE 

 PHILIPPINE ISLANDS. 



BY AUSTIN H. CLARK. 



In a large collection of comatulids recently received at the 

 Museum of Comparative Zoology from the Philippine Islands, 

 Dr. Hubert Lyman Clark found two specimens of a new species 

 of Oligometrides related to the Australian 0. adeonce which he 

 has requested me to describe. It may be called 



Oligometrides bellona, sp. nov. 



Description. — Centrodorsal thin, discoidal, the dorsal pole flat or slightly 

 convex, about 2.5 mm. in diameter, studded with well spaced and evenly 

 distributed granular tubercles; within the circle of cirri is a more or less 

 complete circle of empty cirrus sockets each with a more or less hemi- 

 spherical median tubercle in the center. 



Cirri XXIV, 21-23, about 13 mm. long; cirrus segments subequal, not 

 quite so long as broad; on the third the proximal border is broadly thick- 

 ened, this thickening on the fourth and following becoming a high trans- 

 verse ridge with a sharp, straight crest which on the segments in the outer 

 half of the cirri becomes, when the segments are viewed endwise, evenly 

 convex, then gradually gable-like, and on the antepenultimate reduced 

 to a single spine situated on the proximal edge of the segment; on some 

 of the middle and outer segments of certain cirri midway between the 

 proximal transverse ridge and the distal edge there is a transverse row of 

 minute tubercles representing the distal transverse ridge in 0. adeonce; these, 

 however, are not always present, and when present are inconspicuous. 



Division series broad, thin, in lateral contact, the borders narrowly 

 flattened against those of the plates on either side and therefore straight; 

 synarthrial tubercles very prominent and sharp, slightly produced ; IIBr 

 series 2. 



Arms 11 in number, about 100 mm. long, resembling those of 0. adeonce. 



2— Proc. Biol. Soc. Wash., Vol. 33, 1920. (21) 



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