52 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



In the absence of any material of Monilimetra for comparison I am leaving Mr. 

 A. II. Clark's disposition of the species unchanged. 



In the following key the characters used by H. L. Clark for the species of Monili- 

 metra have been retained in default of more reliable ones. In view of the variable pro- 

 portions of Ft relative to P3 in T. paupera it is doubtful whether this character is of any 

 use in distinguishing T. lepta. The occurrence of four sympatric species seems to me 

 improbable and the morphological difiFerences between them too slight for all to be 

 justified. 



KEY TO THE SPECIES OF TOXOMETRA 



a'. Brachials smooth, not flared distally. 

 6'. P, almost as large as P3. 

 c'. Fourth to sixth cirrus segments more than twice as long as wide; Pi 5-6 mm. long; color in 

 life purple and white, with the cirri all white (north-west Australia; 9-15 meters). 



bicolor (p. 52) 

 d'. Fourth to sixth cirrus segments less than twice as long as wide. 



d'. Proximal pinnules relatively long and slender, P3 with over 30 segments, measuring about 

 25 mm., Pi measuring 12 mm.; color in life brownish, sometimes variegated (north-west 



Australia) nomima (p. 53) 



(P. Proximal pinnules not very elongated, P3 with about 24 segments, measuring under 20 

 mm., Pi measuring about 8 mm.; color in life purple and white with pinnules banded 



(north-west Australia; 0-15 meters) poecila (p. 55) 



6". Pi conspicuously smaller than P3 (north-west Atistralia; &-15 meters) lepta (p. 57) 



a'. Brachials flared and spinous (Flores to the Philippines; 0-510 meters) paupera (p. 58) 



TOXOMETRA BICOLOR (H. L. Qark) 



Monilimelra bicolor IT. L. Clark, Mem. Mus. Comp. Zool., vol. 55, 1938, p. 65 (description; between 

 C.ipe Villarct and Broome, 5-8 fathoms; also near False Cape Bossut, near entrance to Roebuck 

 Bay, and Pearl Shoal, 7 fathoms); figs. 11, 12, p. 56; Echinoderm fauna of Australia, 1946, p. 

 63 (in key; arm bases purple, cirri white). 



Diagnostic features. — The cirri have 15 to 17 segments, of which the fifth and sixth 

 are more than twice as long as wide; P4 is almost as large as P3, which has about 25 

 segments; the brachials are not conspicuously flared. 



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

 and almost completely covered with cirri. 



The cirri are about XXXVIII, 15-17, crowded and more or less recurved. The 

 fourth to sixth segments arc elongated, more than twice as long as the diameter of the 

 nearly cj'lindrical middle; those following are longer than broad and increasingly 

 compressed. The opposing spine is sharp and rather prominent, and the terminal 

 claw is sharp but not strongly curved. 



The radials are concealed. The IBri are short, at least four times as broad as 

 long. The IBr2 (axillaries) are low pentagonal with the lateral margins very short 

 and the width much greater than the length. The synarthrial articulations are very 

 open. 



The 10 arms are appro.ximately equal, about 35 to 40 mm. long. The number of 

 brachials exceeds 80. The character of the brachials and the position of the syzygies 

 are essentially as in T. nomima. 



Pi is 5 or 6 mm. long with some 20 segments of which the basal are short and 

 broad and the distal are somewhat longer than broad; on the whole the pinnule is 

 quite moniliform. Pj is longer and less moniliform but has about the same number of 



