PART S A MONOGRAPH OF THE EXISTEN'G CRINOIDS 729 



Sj'zygies 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 Trichometra 

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

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

 increase in length. P3 is 7 mm. long \\ith about 20 segments, rather stouter than Pj; 

 the fii-st three segments are about as long as broad. P4 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 specunens. 



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

 Tabonan bearmg N. 85° E., 45.2 miles distant (lat. 10°54'00" N., long. 118°26'20" 

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

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



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

 Light bearmg N. 44° W., 32.5 miles distant (lat. 13°12'45" N., long. 121°38'45" 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. 13°37'11" N., long. 120°43'40" E.); 621 meters; 

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



Geographical range. — Northern Philippuie Islands. 



Batkymetrical range. — From 517 to 1334 meters. 



Thermal range. — One record, 4.78° C. 



FARIOMETRA lO (A. H. Clark) 



Figure 45 



Antedon alternala (part) P. H. Carpenter, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, p. 179 

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



Thaumalomclra alternala (part) .\. H. Clark, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 128 

 Oisted) I 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). 



Trichometra 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 alternala P. H. Carpenter, 1888, in 

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



Trichometra Idelicala 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). 



Nepiomclra io A. H. Clark, Journ. Wa-shington Acad. Sci., vol. 7, 1917, No. 5, p. 130 (listed); Un- 

 stalked crinoids of the Siboga-'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., scr. 10, vol. 10, No. 58, 

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



Diagnostic features. — In the two known specimens the arms arc 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 scries are more or less parallel but rugous, tlie IBr, having 

 the sides slightly divergent, not narrowed at the dir^tal end. 



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

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



