228 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



the characters of Anthometra adriani), p. 164 (range), p. 181 (range; represents Crinometra). 

 F. W. CLARKE and WHEELER, U. S. Geol. Surv. Prof. Pap. 90-L, 1915, p. 195 (inorganic constit- 

 uents of the skeleton) ; Prof. Pap. 102, 1917, pp. 23 and following (same). A. H. CLARK, Unstalked 

 crinoids of the Siboga-Exped., 1918, p. 173 (in key; range), p. 184 (key to the included species). 

 F. W. CLARKE and WHEELER, U. S. Geol. Surv. Prof. Pap. 124, 1922, p. 20 (inorganic constituents 

 of the skeleton). GISLEN, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, 

 p. 120; Ark. Zool., vol. 19, No. 32, Feb. 20, 1928, p. 8; Vid. Medd. Dansk Nat. Foren. K0benhavn, 

 vol. 93, 1933, pp. 480, 481, 482; Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, 

 p. 22; Kungl. Svenska Vet.-Akad. Handl., ser. 3, vol. 17, No. 2, October 3, 1938, p. 5. 



Crossometra A. H. CLARK, Journ. Washington Acad. Sci., vol. 6, No. 17, 1916, p. 606 (diagnosis; 

 genotype Pachylomeira investigaloris A. H. Clark, 1909; range; included species); Unstalked 

 crinoids of the Siboga-Exped., 1918, p. 173 (in key; range), p. 174 (key to the included species. 

 GISLN, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, p. 119; Ark. Zool., 

 vol. 19, No. 32, Feb. 20, 1928, p. 8 (notes); Vid. Medd. Dansk Nat. Foren. K0benhavn, 

 vol. 93, 1933, p. 482. 



Perissometra A. H. CLARK, Journ. Washington Acad. Sci., vol. 6, No. 17, 1916, p. 606 (diagnosis; 

 genotype Antedon flexilis P. H. Carpenter, 1888; range; included species); Unstalked crinoids of 

 the Siboga-Exped., 1918, p. 173 (in key; range), p. 176 (key to the included species). GISLEN, 

 Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, pp. 10, 120; Vid. Medd. Dansk 

 Nat. Foren. K0benhavn, vol. 83, 1927, pp. 2, 35; Ark. Zool., vol. 19, No. 32, Feb. 1928, pp. 8, 9. 

 A. H. CLARK, Journ. Linn. Soc. (Zool.), vol. 36, No. 249, April 1929, p. 656. GISLEN, Vid. Medd. 

 Dansk Nat. Foren. K0benhavn, vol. 93, 1933, p. 481; Kungl. Fysiograf. Sallsk. Handl., new ser., 

 vol. 45, No. 11, 1934, pp. 18, 20, 23. 



Calyplomelra A. H. CLARK, Journ. Washington Acad. Sci., vol. 6, No. 17, 1916, p. 608 (diagnosis; 

 genotype Charitometra lateralis A. H. Clark, 1908; range; included species); Unstalked crinoids 

 of the Siboga-Exped., 1918, p. 174 (in key; range), p. 189. GISLEN, Kungl. Fysiogr. Sallsk. 

 Handl., new ser., vol. 45, No. 11, 1934, pp. 18, 20. 



Glytometra PRESTON, Zool. Record for 1928, 1929, p. 32 Echin. 



Diagnosis. A genus of Charitometridae in which the genital pinnules taper evenly 

 from the usually more or less broadened earlier segments to a delicate tip, the portion 

 beyond the gonad being much longer than the gonad itself; the division series and arms 

 are rounded dorsally, with or without a fine median abruptly raised line and a tubercular 

 ornamentation on the division series and arm bases; and the oral pinnules are little or 

 not at all longer than the genital and distal pinnules. 



(geographical range. East Africa from Sokotra southward to East London, South 

 Africa, and eastward to Timor, the Sahul Bank, the Kermadec Islands, Fiji, and the 

 Hawaiian Islands, and northward to southern Japan. 



Bathymetrical range. From 55 to 2,194 meters. 



Thermal range. From4.17to 15.00 C.; the average of all records is about 7.90 C. 



Remarks. As explained in the discussion of the family, there are no valid grounds 

 for maintaining the genera Pachylometra, Crossometra, Perissometra, and Calyptometra 

 as distinct from the earlier Glyptometra. Even with their inclusion the 15 species herein 

 recognized as constituting the genus Glyptometra form a very homogeneous unit the 

 specific lines within which are by no means always well marked indeed it is quite 

 possible that some of the species now recognized are merely varieties or local forms of 

 others. 



The species appear to be divisible into two groups hi one of which the cirri are stout 

 with short segments, whereas in the other they are more slender with longer segments. 

 Although this division seems to be valid as far as the formation of a key is concerned, it 

 should be pointed out that there is an almost continuous sequence from species in which 



