TART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 53 



segments. P3 is much longer and stouter, 12 to 15 mm. long with about 25 segments, 

 of which all but the basal two or three are much longer than broad. P, is almost as 

 long and stout as P3, while Ps is markedly smaller and Pio is the smallest of tho 

 pinnules. Spininess of the distal margins of the pinnule segments is not very marked, 

 but with a lens it is evident on the basal and middle segments of P3 to Pio. 



The color (dry) is deep purple on the calyx and basal portion of the arms; the 

 pinnules, except for some of the larger basal ones, are lighter and distally quite light 

 so that the arms appear distinctly lighter near the tips. The cini are pure white in 

 striking contrast, the very basal segments, however, being deep purple. 



Notes. — Dr. H. L. Clark said that this species is very close to T. nomima and 

 might perhaps be considered a color form of that species, but the difference in the cirri 

 seems to be constant and the coloration of the present form is so strildng that it seems 

 better to regard it as a distinct species. 



Dr. H. L. Clark remarked it is evident that this species cannot be considered com- 

 mon in the Broome region. 



The specimen from near the entrance to Roebuck Bay is somewhat larger and 

 darker than the type, the pinnules being all dark. The arms are about 50 mm. long. 

 The cirri are all wanting. 



The superb specimen from Pearl Shoal has the arms about 60 mm. long and 

 cream white, but the pinnules on the basal 10 to 18 mm. of each arm are red-purple, 

 in sharp contrast. The cirri are pm-e white. 



The specimen from near False Cape Bossut resembles the holotype, but all the 

 cirri and most of the pinnules are wanting. 



Localities. — Near the entrance to Roebuck Bay, Western Australia; H. L. Clark, 

 June 1932 [H. L. Clark, 1938]. 



Pearl Shoal; 13 meters; H. L. Clark, September 26, 1929 [H. L. Clark, 1938]. 



Between Cape Villaret and Broome; 9-15 meters; H. L. Clark, June 1932 [H. L. 

 Clark, 1938] (1, M.C.Z. 946). Type locality. 



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. — From 9 to 15 meters. 



History. — Moniliraetra bicolor was described by Dr. Hubert Lyman Clark in 1938 

 from a specimen from between Cape Villaret and Broome in 5 to 8 fathoms, which 

 he had collected in June 1932. At the same time it was recorded from three other 

 locahties and brief notes were given on the specimens. 



TOXOMETBA NOMIMA (H. L. Clark) 



Monilimetra nomima H. L. Clark, Mem. Mus. Comp. Zool., vol. 55, 1938, p. 48, figs. 5, 6, p. 49 

 (description; Broome; Roebuck Bay; near False Cape Bossut; between Broome and Cape Vil- 

 laret); Echinoderm faima of Australia, 1946, p. 62 (in key), p. 63 (rare at Broome; color variable, 

 predominantly brown). 

 Diagnostic Jeatures. — The fifth and sixth cirrus segments are only a little longer 



than wide; P4 is nearly as large as P3, having about 30 segments; the brachials are not 



conspicuously flared. 



Description. — The centrodorsal is low-hemispherical, not quite 3 mm. in diameter 



and well covered with ciiTus sockets except at the dorsal pole; the sockets nearest the 



pole are very small, those near the margin being the largest. 



