346 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Family CALOMETRIDAE A. H. Clark 



Acoela group (part) P. H. CARPENTER, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, pp. 34, 99 

 131; for further references see under Charitometridae, Part 4c. 



Multicolor group A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1907, pp. 127, 128 (new group to 

 include multibrachiate species of the Acoela group; new species described; varied and handsome 

 coloration in life noted). 



Calometridae A. H. CLARK, Proc. U. S. Nat. Mus., vol. 40, 1911, p. 649 (referred to the Oligophreata) ; 

 Mem. Australian Mus., vol. 4, 1911, p. 725 (absent from Australia), p. 728 (new family to 

 include four genera, not here named, covering the species assigned to Calometra); Crinoids of 

 the Indian Ocean, 1912, p. 6 (exclusively confined to the East Indian region; number of genera 

 and species), p. 9 (absent from Australia), p. 10 (greatly developed in Japan), p. 11 (occurs west 

 to the Andamans), p. 23 (distribution in detail; 20-240 fathoms, average about 95 fathoms), p. 42 

 (new family, to include four genera for the species formerly included in the genus Calometra), 

 pp. 45, 48, 50, 52 (in keys), p. 58 (key to genera), p. 177 (included Calometra and the new genera 

 Oreometra, Neometra, Gephyrometra, and Pectinometra) ; Bull. Inst. OcSanogr. Monaco, No. 294, 

 1914, pp. 7, 8 (relation to temperature) ; Journ. Washington Acad. Sci., vol. 4, No. 19, 1914, 

 pp. 559-563 (correlation of geographical and bathymetrical ranges) ; No. 20, 1914, p. 582 (rela- 

 tion to temperature of habitat). ALEXANDER, Rec. Western Australian Mus. and Art Gallery, 

 vol. 1, pt. 3, 1914, p. 108. A. H. CLARK, Rec. Western Australian Mus. and Art Gallery, vol. 1, 

 pt. 3, 1914, p. 115 (genus and species collected by the Endeavour in Western Australia); Journ. 

 Washington Acad. Sci., vol. 5, No. 4, 1915, pp. 126-134 (bathymetrical range; phylogenetical 

 and paleontological significance); Die Crinoiden der Antarktis, 1915, p. 132 (covering plates 

 compared with those of the Heliometrinae) ; Amer. Journ. Sci., vol. 40, 1915, p. 67 (detailed 

 philosophical discussion of the bathymetrical range) ; Internat. Rev. gesamt. Hydrobiol. und 

 Hydrogr., 1915, p. 225 and following (detailed account of the distribution of the Australian 

 species); Smithsonian Misc. Coll., vol. 65, No. 10, 1915, p. 16 and following (phylogenetical 

 study). H. L. CLARK, Biol. Results Fishing Exper. F. I. S. Endeavour, 1909-14, vol. 4, pt. 1, 

 1916, p. 21 (Oreometra a connecting form between this family and the Zygometridae, if not 

 actually a member of the latter). A. H. CLARK, Unstalked crinoids of the Siboga Exped., 1918, 

 p. 132; Smithsonian Misc. Coll., vol. 72, No. 7, 1921, p. 3. GISLN, Nova Acta Reg. Soc. Sci. 

 Upsaliensis, ser. 4, vol. 5, No. 6, 1922, pp. 9, 94, 120; Zool. Bidrag Uppsala, vol. 9, 1924, pp. 19, 

 42, 44, 55, 61, 79, 84, 85, 88, 90, 92, 100, 231, 280, 284; Vid. Medd. Dansk Naturh. Foren., 

 vol. 83, 1927, p. 30. A. H. CLARK, Journ. Linn. Soc. (Zool.), vol. 36, No. 249, April 1929, p. 

 646. GISLN, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, pp. 18, 20, 22, 

 25; Kungl. Fysiogr. Sallsk. Lund Forh., vol. 7, No. 1, 1936, p. 17. A. H. CLARK, John Murray 

 Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 1936, 1937, p. 103. H. L. CLARK, Mem. Mus. 

 Comp. Zool., vol. 55, 1938, p. 41. GISLEN, Lunds Univ. Arsskr., new ser., Avd. 2, vol. 34, 

 No. 17; Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 49, No. 17, 1939, p. 8 (disk completely 

 plated). H. L. CLARK, Echinoderm fauna of Australia, 1946, p. 23 (in key), p. 53. 



Diagnosis. A family of the superfamily Tropiometrida in which the perisome 

 of the pinnules is protected by conspicuous and highly developed side- and covering- 

 plates; the disk is globose, compact, completely enclosed by a pavement of plates 

 and easily detached; PI is very delicate, flexible, and weak with the first two seg- 

 ments enlarged and the remainder very small and about as long as broad; and P 2 

 and usually also some of the following pinnules are elongated, enlarged, and stiffened, 

 and composed of much elongated segments. The muscular fossae on the articular 

 faces of the radials are very short forming curved bands along the distal border of 

 the interarticular ligament fossae (see Part 2, pp. 40-41, figs. 65, 66, p. 43). 



Geographical range. From western and northeastern Australia westward to the 

 Andaman Islands and northward to the Philippines and southern Japan. 



Bathymetrical range. From 5 to 600 meters. 



