PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 55 



somewhat similar to those but much lighter in color and a Uttle smaller and more deli- 

 cate in structure, is referred to this species but is not considered a paratype. It has 

 the cirri XXXIII, 13-15, but they seem more slender and much less compressed than 

 in the paratypes, none of which, however, have retained enough of their evidently very 

 fugacious cirri for adequate comparison. As regards the pinnules, the proportions are 

 just as in the types but the measurements and actual number of segments are consider- 

 ably less than in the holotype. Thus P3 has fewer than 20 segments and is only 10 to 

 15 mm. long, and P4 is distinctly smaller, but is much more like P3 than hko Pj. Dr. 

 Clark regarded these peculiarities of the pinnules as youthful characters which would 

 soon have been outgrown. Another specimen that he referred to nomima is very yoimg, 

 with the arms only 10 to 12 mm. long. The pinnules are all very slender and with few 

 segments and the cirri are about XXV, 11. Dr. Clark said that the chief reason for 

 referring this very juvenile specimen to nomima is its resemblance to the much larger 

 atypical fifth specimen just discussed, the peculiarities of which he believed are due to 

 immaturity, even though the arms are fuUy 30 mm. long. 



Dr. Clark said that this species is undoubtedly the commonest of the Antedonidae 

 in the Broome region and was taken at least four tinies. 



Localities. — Roebuck Bay, Western Australia; H. L. Clark, August 1929 [H. L. 

 Clark, 1938]. 



Broome; H.L.Clark, June 1932 [H.L.Clark, iy38] (1, M.C.Z., 953). TypelocaHty. 



Between Broome and Capo Villaret; H. L. Clark. 1932 [H. L. Clark, 1938]. 



Near False Cape Bossut; H. L. Clark, September 1929 [H. L. Clark, 1938]. 



Geographical range. — Coast of northwestern Australia from Broome southward 

 to False Cape Bossut. 



Bathymetrical range. — Littoral and sublittoral; Dr. Clark gave no depths but 

 spoke of several of the specimens as dredged. 



History. — Monilimetra nomima was described by Dr. Hubert Lyman Clark in 

 1938. In his accoimt of this species Dr. Clark mentioned two specimens taken in Roe- 

 buck Bay in August 1929; two more dredged near False Cape Bossut early in September 

 1929 ; and three secured at different times in dredging between Broome and Cape Villaret. 



TOXOMETRA POEaLA (H. L. Clark) 



Monilimetra poecila H. L. Clabk, Mem. Mus. Comp. Zool., vol. 55, 1938, p. 53 (description; between 

 Cape Villaret and Broome, 5-8 fathoms; also near Cape Bossut, near entrance to Roebuck Bay, 

 and Pearl Shoal, 7 fathoms); Echinoderm fauna of Australia, 1946, p. 63 (in key; color con- 

 spicuously variegated white, yellow, and purple). 



Diagnostic features. — The cirri have 16 to 18 segments of which the fifth and sixth 

 are the longest but only a little longer than broad, P4 is hardly, if at all, smaller than 

 P3 which has about 24 segments; the brachials are not conspicuously flared. 



Description. — The centrodorsal is low hemispherical, more than 2 mm. in diameter, 

 the small bare area at the dorsal pole \vithout evident cirrus sockets. 



The cirri are XXXIII, 16-18, crowded and more or less recurved. The segments 

 are short and broad. The first three are broader than long, the fourth is about as 

 broad as long, and the fifth and sixth are evidently longer than broad. The segments 

 following are about as long as the distal width. The opposing spine is insignificant. 

 The terminal claw is small but sharp and curved. While the cirri are flattened on the 

 sides they are not markedly compressed. 



