A MONOGRAPH OF THE EXISTING CRINOIDS 109 



more slender; as they increase in length the number of segments rises again to exceed 

 20. The margins of the pinnule segments are uniformly smooth. P a is absent. 



The color (dry) is light purplish brown, the articulations between the brachials 

 conspicuously darker. Distally the dorsal surface of some arms is evidently purple. 

 The centrodorsal is dark purplish brown. The cirri dorsally at the base are deep 

 buff, but pass into purplish brown ventrally and distally. There is a broad band of 

 dark purple on each side of each cirrus near the dorsal side which becomes narrow 

 distally and fades away at the penultimate segment. The disk is light colored except 

 for the anal cone, which is very dark. 



Dr. Clark said that the peculiarities of this unique specimen were not noted at the 

 time of capture, and no special field notes are connected with it. It is apparently a 

 Petasometra, but the short cirri with few segments and the short, rather rugged 

 pinnules set it apart from the species previously known, while its whole appearance 

 is strikingly different from that of the following species (rariegata). He said that 

 it seems strange that in all the collecting of June 1932 no further examples of Petaso- 

 metra were taken. 



This appears to be a young and immature example of P. helianthoides. 



Remarks. The differences between Petasometra helianthoides and the previously 

 described P. clarae are trivial, and it is quite possible that they will eventually prove 

 to represent the same species. 



Localities. Hamburg Southwest Australian Expedition; station 23; South Pass- 

 age, Shark Bay, Western Australia; 9 meters; Drs. W. Michaelsen and Robert Hart- 

 meyer, June 16, 1905 [A. H. Clark, 1912, 1913, 1914, 1915, 1918; H. L. Clark, 1916] 

 (1, H. M.). 



False Cape Bossut, Western Australia; H. L. Clark, September 9, 1929 [H. L. 

 Clark, 1938]. 



Near Shell Islands, Darwin, Northern Territory of Australia; 5-11 meters; 

 sponge and alcyonarian bottom; H. L. Clark, July 15, 1929 [H. L. Clark, 1938]. 



Geographical range. Western and northwestern Australia from Shark Bay to 

 Darwin. 



Bathymetrical range. From the shore line down to 9 (?11) meters. 



History. This species was originally described in my paper on the crinoids of 

 the Natural History Museum at Hamburg, published in 1912. It was redescribed 

 and figured in my supplementary report on the crinoids of the Hamburg Southwest 

 Australian Expedition published in 1913. 



In 1938 Dr. Hubert Lyman Clark described as Petasometra brevicirra a specimen 

 that he had collected at False Cape Bossut (M. C. Z., 916) which is undoubtedly a 

 young individual of this species, and as P. variegata two other specimens (M. C. Z., 

 917, holotype) from near Shell Islands, Darwin, also collected by himself. 



PETASOMETRA CLARAE (Hartlanb) 



PLATE 13, FIGURES 62-64 



[See also vol. 1, pt. 2, fig. 198 (lateral view), p. 127.] 



Antedon clarae HARTLAUB, Nachr. Ges. Gottingen, May 1890, p. 174 (description; Amboina) ; Nova 

 Acta Acad. German, vol. 58, No. 1, 1891, p. 11 (collected by Brock at Amboina), p. 36 (in key), 

 p. 41 (detailed description and comparisons; Amboina), p. 113 (in Gottingen Mus.), pi. 2, 

 fig. 19. A. H. CLARK, Proc. U. P. Nat. Mus., vol. 33, 1907, p. 131 (considered as a synonym of 



