118 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



long. 120°03'25" E.); 960 meters; bottom temperature 5.2° C; gray mud and sand; 

 July 16, 1908 [A. H. Clark, 1911, 1912, 1918] (1, U.S.N.M., 35579). 



Albatross station 5445; off the east coast of Luzop- Atalaya Point, Batag Island, 

 bearing S. 56° E., 5.3 miles distant (lat. 12°44'42" N., long. 124°59'50" E.); 700 

 meters; bottom temperature 6.8° C; green mud and sand; June 3, 1909 [A. H. Clark, 

 1911, 1912, 1918] (1, U.S.N.M., 35581). 



Albatross station 5424; Jol6 (Sulu) Sea; Cagayan Island (S.) bearing S. 11° W., 

 3.4 miles distant (lat. 9°37'05" N., long. 121°12'37" E.); 622 meters; bottom tempera- 

 ture 10.2° C; coral sand; March 31, 1909 [A. H. Clark, 1911, 1912, 1918] (2, U.S.N. M., 

 27498, 35578). 



Siboga station 173; Ceram Sea (lat. 3°27'00" S., long. 131°00'30" E.); 567 meters; 

 line yellow gray mud; August 28, 1899 [A. H. Clark, 1912, 1918] (2, U.S.N.M., E. 397; 

 Amsterdam Mus.). 



Geographical range. — From the northern Philippines to the southern Moluccas. 



Bathymetrical range. — From 567 to 960 meters. 



Thermal range.— From 5.2° to 10.2° C. 



History. — Crotalometra propinqua was described in 1911 from two specimens from 

 Albatross station 5424; at the same time one specimen was recorded from station 5274, 

 and one from station 5445. In a paper including preliminary descriptions of new species 

 collected by the Siboga expedition published in 1912 Crotalometra propinqua was com- 

 pared with C. sulcata, sp. nov., and Crotalometra vera, sp. nov., was described from two 

 specimens from Siboga station 173. In my memoir on the crinoids of the Indian Ocean 

 published later in 1912 I listed Crotalometra propinqua, giving the synonymy and 

 range. In my memoir on the unstalked crinoids of the Siboga expedition published in 

 1918 propinqua and vera were included in a key to the species of Aglaometra; A. vera 

 was redescribed and figured, and the synonymy and range of A. propinqua were given. 



AGLAOMETRA SULCATA (A. H. Clark) 



Plate 13, Figure 40 



Crotalometra sulcata A. H. Clark, Zool. Anz., vol. 39, No. 11/12, 1912, p. 427 (description; Siboga 



station 161). 

 Aglaometra sulcata A. H. Clark, Unstalked crinoids of the Siboja-Exped., 1918, p. 163 (in key; 



range), p. 164 (description; station 161), p. 273 (listed), pi. 21, fig. 53. 



Diagnostic features. — The distal angles of the IBr, and proximal angles of the 

 axillaries, and the corresponding angles of the first two brachials and of the elements of 

 the first syzygial pairs, are widely cut away, forming large and prominent water pores; 

 and the cirri are moderately slender, slightly more than half the length of the arms. 

 The 10 arms are about 115 mm. long, and the cirri are 60-65 mm. long with 63-64 

 segmi ni -. 



Description. — The ccntrodorsal is columnar in the proximal half, rather low conical 

 in the distal, with the cirrus sockets arranged in 10 columns of usually one fully and 

 one partially developed one each; the two columns in each radial area are more or less 

 separated in the inidradial line. 



The cirri are X, 63-64, from 60 to 65 mm. long. The eighth-fourteenth segments 

 are about twice as long as broad; those in the distal third of the cirri arc about half 

 again as broad as long with prominent dorsal spines. 



