230 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



e 3 . Distal cirrus segments about as long as broad. 



/'. Division series and proximal brachials smooth; 18-32 arms 110-170 mm. long; cirri 

 with 20-31 segments; P D with 50-53 segments (northern Luzon southward to 



Timor; 55-520 meters) investigatoris (p. 254) 



f. Division series and arm bases rugose; 13-15 arms 130-170 mm. long; cirri with 15-22 

 segments; PI with 30 segments (Timorlaut to the Laccadive Islands and the Sey- 

 chelles; 914-1,462 meters) macUenta (p. 259) 



<P. Cirri more slender with the distal segments all longer than broad; division series and arm 



bases smooth, not rugose; 11-20 arms. 



e l . Proximal portion of the animal constricted, the sides of the IBr series being nearly 

 parallel, the IIBr series somewhat abruptly turned outward (Meangis Islands; 914 



meters) ang-usticalyx (p. 263) 



e*. Proximal portion of the animal not constricted. 

 /'. Division series and arm bases moderately broad; cirri with up to 21 segments (off 



Sokotra; 2,194 meters) sparksi (p. 266) 



f 2 . Division series and arm bases broader; cirri with 16 segments (vicinity of East London, 



South Africa; 548-566 meters) sclateri (p. 268) 



<?. Cirrus sockets arranged in 15 columns on the centrodorsal. 



d 1 . Division series and arm bases smooth, without ornamentation; 12-14 arms 100 mm. long; 



cirri with 14-15 segments (Philippines; 329-1,334 meters) levigata (p. 271) 



<P. Division series and arm bases with rugose ornamentation. 



'. Outermost cirrus segments about as long as broad or broader than long; lateral edges of 

 the ossicles of the IBr series and earlier brachials not turned outward; 10 arms 115- 



130 mm. long (southern Japan; 660 meters) lata (p. 272) 



6 s . Outermost cirrus segments, like those preceding, markedly longer than broad; lateral 



edges of the elements of the division series and earlier brachials turned outward. 

 /'. Rugose ornamentation finer, the proximal brachials each with a small rounded central 

 tubercle; 12 arms 170 mm. long; cirri with 20-21 segments, 30-34 mm. long (off 



South Andaman Island; 1,040 meters) invenusta (p. 275) 



/ 2 . Rugose ornamentation coarse, the proximal brachials each with a low broad hump; 

 cirri with 15-21 segments, 30-40 mm. long; 10-11 arms 160-180 mm. long (Hawaiian 

 Islands; 583-824 meters) lateralis (p. 276) 



GLYPTOMETRA TIMORENSIS A. H. Clark 



PLATE 21, FIGURES 66, 67 

 [See also vol. 1, pt. 1, fig. 100, p. 162.] 



Glyptometra timorensis A. H. CLARK, Proc. Biol. Soc. Washington, vol. 25, 1912, p. 80 (description; 



Siboga station 297) . 

 Perissometra timorensis A. H. CLARK, Journ. Washington Acad. Sci., vol. 6, No. 17, 1916, p. 607 



(listed); Unstalked crinoids of the Si&ojo-Exped., 1918, p. IX (relationship with P. lata), p. 177 



(in key; range), p. 182 (detailed description; Sta. 297), p. 183, fig. 7, p. 275 (listed), pi. 24, fig. 71. 



GISLEN, Ark. Zool., vol. 19, No. 32, Feb. 20, 1928, p. 8. 



Diagnostic features. All the cirrus segments are much broader than long; the 

 cirrus sockets are arranged in 10 columns on the centrodorsal; the 10 arms are up to 

 165 mm. in length; the ossicles of the division series and proximal brachials have the 

 lateral and the outer part of the proximal and distal edges everted and more or less 

 crenulate or scalloped; and the cirri are 20-25 mm. long with 17-20 segments. 



Description. The centrodorsal is very thick-discoidal, the sides sloping slightly 

 inward, 6.5 mm. in diameter at the base and 3.0 mm. high. The cirrus sockets are 

 arranged hi 10 columns of 2 each, the columns closely crowded against each other and 

 showing no separation into pairs. 



