2(1 EnilNODERMA OF THE InDIAN MuSEUM, PART VII. 



smallest, crinoid of the Greater Antilles. The genu.s Pcrometra is found through- 

 out the range of the subfamily in the East Indian region, while the genus 

 Erythrotnetra, so far as known, is confined to south-western Japan, occurring in 

 water of from 55 to 105 fathoms in depth. 



The subfamily Zenometrinse is confined, in the East Indian region, to between 

 the depths of 78 and 1,588 fathoms; one of the genera, Balanometra , is only 

 known from the Philippine Islands in water having a depth of from 78 to 82 

 fathoms ; Adelometra occurs in 140 fathoms off the Ki Islands, and in 211 fathoms 

 off Cuba. Zenometra is found in the Hawaiian Islands in from 192 to 352 

 fathoms, and in the northern West Indies; both of these doubtless occur through- 

 out the Indian Ocean. Psathyrometra is found from the (ialapagos Islands, 

 British Columbia, and the western Aleutian Islands to the Andaman Islands and 

 the Burmese coast, the northern and eastern species being the largest and the 

 western the smallest, and reappears, somewhat modified, as the genus Leptometra 

 in the Mediterranean and along the eastern coast of the Atlantic from Madeira 

 to the Faroe Islands. Psathyrometra ranges from 188 to 1,588 fathoms, more 

 than half of the species occurring below the 500-fathom line. In view of this it 

 is rather curious that it does not extend, unchanged, into the Atlantic. 



The subfamily Heliometrinae is represented in the East Indian region by two 

 genera, Cyclometra and Trichometra ; the former ranging from the mouth of the 

 Red Sea to southern Japan in from 107 to 1,200 fathoms, and the latter from the 

 Hawaiian Islands nearly to Ceylon in from 138 to 430 fathoms, also occurring in 

 the West Indies and on the south-eastern coast of the United States. Cyclometra 

 is closely allied to Heliometra, Solanometra and P rom.achocrinus , while Trichometra 

 is allied to Hathrometra. These two genera, therefore, appear to have been the 

 starting point whence has been derived the characteristic fauna of the Antarctic 

 region, which extends northward along the west coast of South and North America 

 to the Bering Sea and southward again to southern Japan , and the characteristic 

 fauna of the north Atlantic, the Arctic Ocean, the Sea of Okhotsk, the Gulf of 

 Tartary, and the western coast of the Sea of Japan. 



The subfamily Thysanometrinse includes only two genera in the East Indian 

 region, and is found only in southern Japan, the Philippine Islands, and the 

 Andaman Islands, ranging in depth from 70 to 150 fathoms. One of the genera 

 [Eumetra) occurs in the Andaman and in the Philippine Islands, the other 

 [Thysanometra) in the Philippines and off southern Japan. The latter is closely 

 related to a common genus (Goccometra) in the Caribbean Sea. 



Species of the two genera of Bathymetrinse occur from the west coast of 

 America and the Aleutian Islands to the Antarctic seas and the east coast of 

 Africa, Thaumatometra inhabiting water of from 80 to 1,600 fathoms in depth, 

 a,nd Bathymetra, being found between 1,200 and 2,900 fathoms, the latter being the 

 greatest depth at which crinoids have been dredged. ThaumatomMra occurs in 

 the extreme south of the Atlantic, while Bathymetra is known from as far north 

 in that ocean as the Abrolhos Islands in Brazil. 



