A MONOGRAPH OF THE EXISTING CRINOIDS 351 



ences in the IBr scries are due solely to the fact that in the specimen described as 

 pericalles the IBr series are strongly turned outward. The differences in the pinnules 

 of the two specimens as described are wholly negligible except for such as are corre- 

 lated with the difference in size. 



I cannot see any evidence whatever in favor of Dr. Clark's view that the genus 

 Reometra "is a connecting form with the Zygometridae, if not actually a member of 

 that family." Excepting for the occurrence of a syzygy, as described by him, between 

 the ossicles of the IBr series, Reometra differs in every single detail from all the species 

 of Zygometridae, while at the same time agreeing in practically all details with the 

 other genera of Calometridae. 



Although, thanks to Dr. Clark's kindness, I saw the type specimen of Oreometra 

 pericalles during a visit to Cambridge, I did not have sufficient tune to examine it 

 in detail. 



' History. The name Oreometra mariae first appears as a nomen nudum in my 

 description of Neometra sibogae published on April 23, 1912. I noted that in N. 

 sibogae "the cirrus sockets encroach more or less upon the radial as do those of Oreo- 

 metra mariae." Oreometra mariae was described in detail in my monograph of the 

 crinoids of the Indian Ocean published on November 22, 1912. 



In 1916 Dr. H. L. Clark described and figured Oreometra pericalles, and in 1934 

 Prof. Torsten Gisl6n listed 0. mariae among the species having the Heterometra 

 bengalensis type of arm division. 



Genus GEPHYROMETRA A. H. Clark 



Anledon (part) A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 132. 



Calometra (part) A. H. CLARK, Smithsonian Misc. Coll. (Quarterly Issue), vol. 50, pt. 3, 1907, 

 p. 363. 



Pectinometra (part) A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 180. 



Gephyromelra A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 58 (in key), p. 184 (diagnosis; 

 genotype Anledon versicolor A. H. CLARK, 1907 [references on pp. 10, 23 are to Calometra]). 

 GISLEN, Kungl. Fysiogr. Sallsk. Handl., new sev., vol. 45, No. 11, 1934, p. 20. 



Diagnosis. A genus of Calometridae in which the arms are about 20 in number, 

 with all the division series 2 ; P 3 , the longest proximal pinnule, is nearly twice as long 

 as the shorter genital pinnules, slender, but stiffened; the radials have no interradial 

 extensions, or if these are present they are very narrow and the bases of the IBrj 

 meet over them. 



Geographical range. From southwestern Japan to southern Annam. 



Bathymetrical range. From 5 to 174 meters. 



Thermal range. One record, 13.28 C. 



History. The genus Gephyrometra was formally diagnosed in my monograph of 

 the crinoids of the Indian Ocean published on November 22, 1912, the genotype 

 being given as Antedon versicolor A. H. Clark, 1907. Its status has not changed since 

 it was first established. 



GEPHYROMETRA VERSICOLOR (A. H. Clark) 



PLATE 36, FIGURE 189; PLATE 39, FIGURE 204 



Antedon versicolor A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 132 (color; description; 

 Albatross station 4884). 



