456 AUSTIN HOBART CLARK, 



pentagon ; it is irregularly pentagonal in shape, with partially obliterated 

 cirrus sockets about the periphery; one fully grown cirrus remains, and there 

 are two rudimentary cirri; the fully grown cirrus is 11,5 mm long with 16 

 segments; the dorsal portion of the perisome, between the division series, 

 is heavily plated as usual. The colour is dull yellowish white, the dorsal 

 perisoniic areas and the extreme sides of the division series being yellow- 

 brown ; the sides of the free undivided arms are usually darker than the 

 dorsal surface, sometimes a deep yellow-brown ; some of the free arms 

 have a more or less perfect dark brown mediodorsal stripe. 



The specimen from Freycinet Reach, Sharks Bay, has about one hundred 

 and twenty arms, of which the anterior are about 120 mm and the posterior 

 about 80 mm in length; the left posterior ray and its derivatives, and the 

 adjacent halves of the neighbouring rays, are devoid of ambulacral grooves; 

 many of the arms on the other rays have rudimentary ambulacral grooves, 

 or none at all; the genital pinnules are rarely grooved; the dorsal peri- 

 some, where exposed, is heavily plated; the centrodorsal is thin-discoidal, 

 the dorsal pole strongly concave, 4.5 mm in diameter: three cirri, equally 

 spaced, remain ; these are comparatively long (13 mm) and moderately 

 stout, with 16 segments of which the first is short, the following gradually 

 increasing in length and becoming about as long as broad on the fourth; 

 the fifth to the eighth are slightly longer than broad; the following are 

 about one third (or rather less) broader than long and bear subtermiual 

 tubercles which in the last three are moderately sharp. 



Like C. SMegelii this species may or may not retain the cirri when 

 adult; as in that form there are usually from one to four, though in one 

 specimen from west Australia which I examined at the British Museum 

 there are as many as twelve. 



Submenus Comanthus A. H. Clark. 



Species group Bennettia A. H. Clark. 

 Comanthus (Bennettia) trichoptera (J. Mtiller). 



Literature: See "The recent Crinoids of Australia", and "The Crinoids of the Indian 

 Ocean". 



Locality: Stat. 56. Koombana Bay, 67 miles southwest of 

 Bun bury; 14V 2 18 meters; rocky bottom, with a few plant-like orga- 

 nisms; 28. VII. (2 specimens). 



Further Distribution. Southern Australia and Tasmania, 

 north on the eastern coast of Australia to Broughton Is- 

 lands, near Port Stephens (about 32 40' S. lat.); the definite records 

 are : King George Sound; Port Phillip; Tasmania: Cape 



