THE RECENT CRINOIDS OF AUSTRALIA CLARK. 773 



segment ; the first, second, and thii'd segments of the earlier 

 pinnules are slightly carinate, tlie carination being sharply 

 truncated distally so tliat the outer profile is straight and not 

 convex as in G. emendatrix. 



The colour is white and purple, in bands of about one quarter 

 of an inch in width ; the cirri are brown. 



Localities. — Adele Island, North Australia (type locality) ; 

 Baud in Island. 



The tyj)e specimen is in the British Museum. 



Genus COLOBOMETRA, ^. ^. Clark. 



Colohometra, 1909, A. H. Clark, Proc. Biol. Soc. Washington, 

 vol. 22, p. 5 (Antedon perspinosa, p. H. Carpenter, 1881). 



Differential Characters. — The genus Co^oiome^ra lacks the first 

 inner pinnule (Pa). All of the species have ten arms, the 

 brachials with exceedingly spiny distal ends. The cirri are long 

 with numerous segments, the outer bearing paired dorsal spines, 

 the proximal with ))roduced and veiy spinous edges. Some or all 

 of the lower pinnules are much enlarged and their component 

 segments liave very stiff with very spinous distal ends ; the 

 middle and outer pinnules also have segments with very spinous 

 distal ends. 



Range. — Colohometra is found from the Red Sea eastward to 

 northern and eastern Australia, Lord Howe Island, the Solomon 

 Islands, the Philippines, and Singapore. 



COLOBOMETRA PERSPINOSA (P. H. C). 



Antedon perspinosa, 1881, P. H. Carpenter, Notes from the 



Leyden Museum, vol. 3, p. 178 (Jobie), 

 Antedon insignis, 1882, Bell, Proc. Zool. Soc, 1882, p. 534 (Port 



Denison). 

 Antedon loveni, 1884, Bell, Rep. Zool. Coll. H.M.S. "Alert," p. 



158, j)l. X., figs. B, Ca-e (not Aa-e as given in the reference 



to the plate) (Port Denison ; this and the preceding species 



are founded on the same specimen). 

 Colohometra perspinosa, 1909, A. H Clark, Proc. Biol. Soc. 



Washington, vol. 22, p. 6. 

 Differential Characters. — Colohometra perspinosa lacks the first 

 inner pinnule (that on the first syzygial pair) on each arm ; the 

 long cirri have about sixty segments, comparatively long proxi- 

 mally, short distally, the longer proximal segments with the 

 distal ends produced into an overlapping border of long spines ; 

 the shorter distal segments bear paired spines dorsally ; the lower 



