A MONOGRAPH OF THE EXISTING CRINOIDS 109 



long, cirri 60-65 mm. long with 63-64 segments (west of Waigeu to northern Celebes; 457-798 

 meters). sulcata (p. 118) 



AGLAOMETRA VALIDA (P. H. Carpenter) 



PLATE 12, FIGURE 37; PLATE 13, FIGURES 38,39 

 [See also vol. 1, pt. 2, fig. 225, p. 179.] 



Antedon valida P. H. CARPENTER, Challenger Reports, Zool., vol. 26, pt. 60, 1888, p. 104 (description; 

 station 214), pi. 15, figs. 5-8. HARTLAUB, Bull. Mus. Comp. Zool., vol. 27, No. 4, 1895, p. 131 

 (systematic and bathymetrical relationships), p. 134 (size compared with that of [Thalassometra] 

 agassizii). HAMANN, Bronn's Klassen und Ordnungen des Tier-Ueiohs, vol. 2, Abt. 3, 1907, 

 p. 1578 (listed). A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 18 (not placed 

 in a revision of the Thalassometridae) ; Proc. U. S. Nat. Mus., vol. 36, 1909, p. 404 (referred to 

 Crotalometra) ; Crinoids of the Indian Ocean, 1912, p. 33 (of P. H. Carpenter, 1888= Crotalometra 

 valida). 



Thalassomelra valida A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3. 1907, p. 360 (listed). 



Crotalometra eupedala A. H. CLARK, Proc. U. S. Nat. Mus., vol. 36, 1909, p. 404 (description; Alba- 

 tross station 5236; also station 5116); Proc. U. S. Nat. Mus., vol. 39, 1911, pp. 549, 550 (cirri 

 compared with those of C. propinqua), p. 551 (small 11-armed specimen doubtfully referred to 

 this species in 1909 is really [Oceanomeira] annandalei) ; Crinoids of the Indian Ocean, 1912, p. 209 

 (synonymy; locality). 



Crotalometra valida A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 33 ( = Anledon valida P. H. 

 Carpenter, 1888), p. 209 (synonymy; locality). 



Aglaometra valida A. H. CLARK, Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 47 (published refer- 

 ences to specimens in the B. M. ; Challenger station 214; comparison with A. eupedata); Un- 

 stalked crinoids of the Siboga-Exped., 1918, p. 163 (in key; range), p. 164 (notes; station 122), 

 p. 273 (listed). 



Aglaometra eupedata A. H. CLARK, Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 47 (comparison 

 with t>a!ida): Unstalked crinoids of the Siboga-Exped., 1918, p. 163 (in key; range), p. 164 (refer- 

 ences). 



Diagnostic features. The elements of the IBr series and lower brachials are in 

 close lateral contact; the proximal portion of the animal is strongly compressed, the 

 lateral profiles from the base of the centrodorsal being nearly straight and making with 

 each other an angle of approximately 45 when the division series and arm bases are 

 in contact; and the cirri are long and stout, much more than half the length of the arms. 

 The 10 arms are 100-150 mm. long, and the cirri are 80-90 mm. long with 65-66 

 segments. 



Description. The centrodorsal is large and conical, with the ventral interradial 

 angles produced. The cirrus sockets are arranged in 10 columns, one or two to a 

 column. The columns are situated along the outer borders of the radial areas and are 

 separated in the midradial line by a bare and somewhat excavated triangle which at 

 the base, just below the radials, is as broad as, or broader than, the adjacent cirrus 

 sockets. 



The cirri are about XV, about 65, up to 80 mm. in length; the seventh-twelfth 

 segments are considerably longer than broad, but from the twenty-fifth onward the 

 segments are short and broad with a strong dorsal spine. 



The radials are just visible. The elements of the IBr series are strongly convex 

 in the middle of the articulation between them. The borders of the radials, the ele- 

 ments of the IBr series, and the lowest brachials are fringed with strong spines. The 

 IBr 2 (axillaries) and first brachials have straight edges and flattened sides. 



