126 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



C. rubrqflava and C. ophiura, seem to be very closely related, though on the basis of 

 our present knowledge they are quite distinct. 



One species, C. magnified, has a very extensive range, occurring from southwestern 

 Japan and the Bonin Islands to the Lesser Sunda Islands; two species, C. hartlaubi 

 and C. rubroflava, occur only hi southern Japan, the latter ranging south to Hongkong ; 

 and the fourth species, C. ophiura, is found only from the Lesser Sunda Islands to the 

 Philippines. 



Though occurring in rather shallow water, the species of Catoptometra live at a 

 greater depth than the species of Zygometra, the upper limits of the former slightly 

 overlapping the lower limits of the latter. 



History. The generic name Catoptometra was first used in a list of the crinoids 

 of Japan published July 15, 1908. No diagnosis was given. Three species were 

 mentioned, Catoptometra hartlaubi, C. koehleri, and C. rubroflava. In another paper 

 published in the same volume on August 25, 1908, the genus Catoptometra was listed 

 and the type species was given as Antedon hartlaubi A. H. Clark, 1907. No diagnosis 

 was published until 1912, when it was inserted in a key to the genera of the family 

 Zygometridae and the characters separating it from Zygometra were given. The 

 question whether the endocyclic comatulids with a syzygy in the IBr series and smooth 

 cirri should retain the name Catoptometra, or assume the unfamiliar name Zygometra, 

 has already been discussed (see page 81). 



KEY TO THE SPECIES IN THE GENUS CATOPTOMETRA 



a 1 . Arms 30-80 in number; all division series 2 (southwestern Japan, Bonin Islands, and Philippines 



to southern Annam and Lesser Sunda Islands; 36-914 meters) magnifica (p.126) 



a 2 . Less than 30 arms; IIBr series 4 (3 + 4). 



&'. Cirri short and stout, few or none of segments longer than broad; 11-14 arms; in life broadly 

 banded with bright red and bright yellow (southern Japan from Sagami Bay to Korean 



Straits and southward to Hongkong; 25-183 meters) rubroflava (p. 133) 



b 1 . Cirri longer and less stout, longest segments being twice as long as median width; 20 or more 



arms. 



c 1 . Arms 20-23 in number; cirrus segments 1417 (usually 14 or 15); elements of division series 

 and first two brachials with prominently everted and produced spinous distal edges; 

 dorsal pole of centrodorsal papillose or finely spinous; color in life uniform, brown or 

 greenish (southern Japan from Sagami Bay to Korean Straits; 137 [HIS] - 278 meters) 



hartlaubi (p. 139) 



c 2 . Arms 20-27 in number; cirrus segments 15-19 (usually 17-19) ; elements of division series 

 and arm bases smooth; dorsal pole of centrodorsal smooth; color in life usually dark green, 

 rarely red and yellow (from Lesser Sunda Islands to Philippines; 69-106 meters) 



ophiura (p. 136) 

 CATOPTOMETRA MAGNIFICA A. H. Clark 



PLATE 7, FIGURES 24, 25; PLATE 8, FIGURE 26; PLATE 9, FIGURE 31 



Caloptomelra magnifica A. H. CLARK, Smithsonian Misc. Coll., vol. 52, 1908, p. 208 (description; 

 Albatross station 5137); Crinoids of the Indian Ocean, 1912, p. 106 (synonymy; habitat); Amer. 

 Journ. Sci., vol. 40, 1915, p. 62 (listed); Unstalked crinoids of the Siboga-Exped., 1918, p. 63 

 (in key; range). GISLEN, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, p. 67 

 (compared with C. m. minor). A. H. CLARK, Journ. Linn. Soc. (Zool.), vol. 36, 1929, p 637 

 (off Cape Padaran, 80 fathoms; Rotti Strait, 100 fathams.). GISLEN, Kungl. Fysiogr. Sallsk. 

 Handl., new ser., vol. 45, No. 11, 1934, p. 33; Kungl. Fysiogr. Sallsk. Lund Forh., vol. 7, No. 1, 

 1936. p. 2 (southern Annam), p. 4 (French Indochina), p. 6 (range). 



