A. H. CLARK : THE CRINOIDS OF THE INDIAN OCEAN. 213 



IBr, (axillaries), which are missing in tiie other specimen, are approximately 

 triangular (though probably shield-shaped as in the other species of the genus 

 when full}' grown), twice as broad as long, with a high sharp carination in the 

 proximal two-thirds of the median line, and with everted and spinous distal 

 edges. 



On one of the rays the IBr.^ is not axillaiy as usual, but bears a pinnule, 

 which is essentially similar to P , in S. arachnoides ; the second segment beyond 

 this is axillary ; there is no carination beyond the first pinnule. Only two 

 axillaries are preserved, both detached : one has lost both derivatives at the 

 first post-axillary articulation, the other bears on one side one and on the other 

 side three brachials. 



STIREMETRA ARACHNOIDES. 



Steno)netm amchnoiilts 1909. A. H. Clark, Proc. U. S. Nat. Mus., vol. 36, 

 p. 402. 



Habitat, — Queensland ; Philippine Islands. 

 Depth. — Littoral, and down to 12 fathoms. 



Genus PARAMETRA. 



Paranidni 1909. A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, p. 15 

 (Antedon orion A. H. Clark, 1907). 



PARAMETRA COMPRESS A. 



Ayiiedon coiitpressa 1888. P. H. Carpenter," Challenger" Reports, vol. 26, 



Zoology, p. 222, pi, xli. 

 Parametra compresmi 1909. A. H. Clark, Proc. Biol. Soc, Washington, vol. 22, 



p. 16. 



Habitat. — Ki and Phihppine Islands. 



Depth.— 97-279 fathoms. 



PARAMETRA ORION. 



Ankdon orion 1907. A. H. Clark, Proc. U. S. Nat. Mus., vol. 33, p. 143. 

 Parametra orion 1909. A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 

 p. 16. 



Habitat. — Southern Japan and southward to Formosa (Taiwan). 

 Depth. — !S5-170 fathoms. 



PARAMETRA FISHERI. 

 Thalassometra fisheri. 1908. A. H. Clark, Proc. U. S. Nat. Mus., vol. 34, p. 223. 

 Parametra fisheri 1909. A. H. Clark, Proc. Biol. Soc. Washington, vol. 22 

 p. 16. 



