PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 729 



Syzygies occur between brachials 3+4, 9+10, and 14+15, and distally at intervals 

 of 2 muscular articulations. 



PI is 10 mm. long with 20 segments, resembling the same pinnule in Trichomctra 

 cubensis but proportionately stouter. P 2 is 7 mm. long with 16 segments, more slender 

 than P, ; the first three segments are about as long as broad, and the following gradually 

 increase in length. P 3 is 7 mm. long with about 20 segments, rather stouter than Pjj 

 the first three segments are about as long as broad. P< is 7 mm. long and carries a 

 small gonad. The following pinnules are similar, but have larger gonads. The distal 

 portion of the arms is lacking in all the specimens. 



Localities. Albatross station 5349; Palawan Passage, Philippine Islands; Point 

 Tabonan bearing N. 85 E., 45.2 miles distant Gat. 1054'00" N., long. 11826'20" 

 E.); 1334 meters; temperature 4.78 C.; December 27, 1908 [A. H. Clark, 1911, 1918] 

 (1, U.S.N.M., 36043). 



Albatross station 5123; eastern coast of Mindoro, Philippine Islands; Malabrigo 

 Light bearing N. 44 W., 32.5 miles distant Oat. 1312'45" N., long. 12138'45" E.); 

 517 meters; green mud; February 2, 1908 [A. H. Clark, 1908, 1918] (1, U.S.N.M., 

 25452). Type locality. 



Albatross station 5115; Verde Island Passage, Philippines; Sombrero Island bearing 

 N. 49 E., 7.3 miles distant (lat. 1337'11" N., long. 12043'40" E.); 621 meters; 

 density 1.02454; January 20, 1908 [A. H. Clark, 1918] (1, U.S.N.M., 36014). 



Geographical range. Northern Philippine Islands. 



Bathymetrical range. From 517 to 1334 meters. 



Thermal range. One record, 4.78 C. 



FARIOMETRA IO (A. H. Clark) 



FIGURE 45 



Antedon alternate (part) P. H. CARPENTER, Challenger Reports, Zoology, vol. 26, pt. CO, 1888, p. 179 

 (specimen from sta. 218), pi. 32, fig. 6; similarly included in alternata by following authors. 



Thaumatometra alternata (part) A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 128 

 (listed); Proc. U.S. Nat. Mus., vol. 34, 1908, p. 265 (additional element in a IBr series in the 

 Challenger specimen compared to the same in a Japanese specimen of Poecilometra acoela [scalaris]) ; 

 Crinoids of the Indian Ocean, 1912, p. 246 (New Guinea). 



Trichomelra delicata (not T. delicata A. H. Clark, 1911) A. H. CLARK, Notes Leyden Mus., vol. 34, 

 1912, p. 146 (description; Siboga sta. 211; includes Antedon alternata P. H. Carpenter, 1888, in 

 part); Unstalked crinoids of the Siboga-Exped., 1918, p. 252 (=Nepiometra to). 



Trichometra tdelicata A. H. CLARK, Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 64 (published 

 reference to the specimen in the B.M.; Challenger sta. 218). 



Nepiometra io A. H. CLARK, Journ. Washington Acad. Sci., vol. 7, 1917, No. 5, p. 130 (listed); Un- 

 stalked crinoids of the Sioooo-Exped., 1918, p. 251 (in key; range), p. 252 (synonymy; detailed 

 description; sta. 211), p. 274 (listed), pi. 26, fig. 97; Ann. Mag. Nat. Hist., ser. 10, vol. 10, No. 58, 

 1932, p. 388 (compared with N. nicippe sp. nov.). 



Diagnostic features. In the two known specimens the arms are only 30 mm. long; 

 the cirri are about XL, 20-22, with the longest segments about twice as long as the 

 width of the expanded distal ends [or nearly three times the median diameter A.M.C.]; 

 the sides of the division series are more or less parallel' but rugous, the IB^ having 

 the sides slightly divergent, not narrowed at the distal end. 



Description [modified by A.M.C.]. The centrodorsal is rounded conical, 1.4 

 mm. in basal diameter and 1.1 mm. in vertical height. There are nearly forty well- 



