A MONOGRAPH OF THE EXISTING CRINOIDS 503 



ties on the strength of specimens whicli I had examined at the British Museum 

 in 1910. I also included west Java, althou<:h for some reason this had been omitted 

 from my manuscript on the Leyden crinoids. 



In my monograph on the crinoids of Australia published in 1911, and in the 

 monograph on the crinoids of the Indian Ocean published in 1912, I relegated diniri- 

 cata to the synonymy of briareus. 



In 1913 I listed and gave notes on the specimens of this species in the British 

 Museum, and in the same year Dr. August Reichensperger recorded and gave notes 

 on 2 specimens from the Aru Islands. 



In 1918 I recorded briareus from 10 Siboga stations in the Dutch East Indies 

 and gave notes on the specimens. 



In 1921 Dr. Hubert Lyman Clark recorded 28 specimens from Dr. Laurence E. 

 Griffin's Philippine collection and described the colors in life. 



COMANTHERIA ROTULA A. H. Clark 



Plate 5S, Figure 165 



Comanlheria rotula A. H. Clark, Proc. Biol. Soc. Washington, vol. 25, 1912, p. 23 (de.scription; 

 Siboga station 273); Smiths. Miscell. Coll., vol. 61, No. 15, 1913, p. 14 (no locality; characters 

 of the specimen); Proc. Biol. Soc. Washington, vol. 29, 1916, p. 105 (comparison with C. 

 intermedia); Unstalked Crinoids of the Siboga Exped., 1918, p. IX (relationships with C. in- 

 termedia); p. 43 (in key; range); p. 45 (references; notes; stations 273, 282); p. 275 (listed); 

 pi. 16, fig. 26. 



Comanthus rotula H. L. Clark, Biol. Results Fishing Experiments F. I. S. Endeavour, 1909-1914, 

 vol. 4, pt. 1, 1916, p. 15 (comparison with C. perplexum). 



Comaster typica Gisl6n, Kungl. svenska Vetenskap. Akad. Handl., vol. 59, No. 4, 1919, p. 9 

 (Mjoberg's station 13); pi. 1, fig. 3. 



Coviaster typica form minor Gisl^n, Kungl. svenska Vetenskap. Akad. Handl., vol. 59, No. 4, 

 1919, p. 11. 



Comanthus parvicirra a comasteripinna Gislen, Nova Acta reg. Soc. sci. Upsaliensis, ser. 4, vol. 5, 

 No. 6, 1922, p. 50 (specimen from Mjoberg's station 13). 



Diagnostic features. — A rather small species with 40 arms. The IIBr series are 

 4 (3 + 4) and the IIIBr series are 2; there is no further division. The centrodorsal is 

 much reduced, irregularly circular or subpentagonal in shape, and almost always 

 bears a few rudimentary cirri, although there may be none, in which case the edge 

 of the centrodorsal is notched by obsolete cirrus sockets. 



This species is most easdj' confused wdth Comanthus timorensis, which super- 

 ficially it closelj' resembles. 



Description. — The centrodorsal is great!}' reduced. 



There are usually a few weak cirri, though there maj' be none. 



The IIBr series are 4 (3 + 4). The IIIBr series are 2. There is no further 

 division. 



The 40 arms are from 100 to 150 mm. long. 



The dorsal surface of the animal is smooth, with comparatively little overlapping 

 of the brachials. The rugged appearance characteristic of C. briareus is entirely 

 absent. 



Notes. — In the specimen from Mjoberg's station 13 the centrodorsal is pentag- 

 onal, with the angles interradial, 4 nnn. in diameter. The margin is irregular and 



