A MONOGRAPH OF THE EXISTING CRINOIDS 113 



PI. P 3 is 6 mm. long, more slender than P 2 , bearing about the same proportion to that 

 pinnule as it does to PI, with 12 segments which at first are broad, becoming about as 

 long as broad on the fifth, and longer than broad distally. The pinnule is strongly 

 prismatic, the ridges and the distal ends of the segments being spinous, but the 2 basal 

 keels are only slightly marked. P 4 and the following pinnules are similar to P 3 but 

 slightly more slender with the segments proportionately slightly longer. The distal 

 pinnules are 12 mm. long, rather stout, strongly prismatic, with 18 segments of which 

 the first is crescentic, the second is strongly trapezoidal, about as broad as the greater 

 (proximal) length, and the remainder are about half again as long as broad. The 

 external ridge is somewhat produced and is finely spinous. 



Of the three specimens from Meriado Bay, Celebes, one is fragmentary with the 

 cirri stout and about 80 mm. long, and the other two are small, one with the cirri 

 about 65 mm. long. 



Localities. Albatross station 5236; off the east coast of Mindanao, Philippines; 

 Magabao Island (S.) bearing N. 85 W., 9.1 miles distant (lat. 850'45" N., long. 126 

 26'52" E.); 903 meters; bottom temperature 5.1 C.; fine gray sand; May 11, 1908 

 [A. H. Clark, 1909, 1911, 1912, 1913, 1918] (1, U.S.N.M., 25462). 



Challenger station 214; off the Meangis Islands, southeast of Mindanao, Philip- 

 pines (lat. 433' N., long. 12706' E.); 914 meters; bottom temperature 5.44 C.; 

 blue mud; February 10, 1875 [P. H. Carpenter, 1888; Hartlaub, 1895; A. H. Clark, 

 1907, 1909, 1912, 1913, 1918] (2, B. M.). 



Siboga station 122; east of northern Celebes (lat, 158'30" N.,long. 12500'30" E.); 

 1,165-1,264 meters; stone; July 17, 1899 [A. H. Clark, 1918] (4, U.S.N.M., E. 3216; 

 Amsterdam Mus.). 



Menado Bay, northern Celebes (lat. 131'N., long. 12447' E.) ; 457 meters; 

 Captain Christiansen, Great Northern Telegraph Company, March 12, 1913 (3, C. M.). 



Geographical range. From Mindanao to northern Celebes. 



Bathymetrical range.- From 457 to 1,165 (?1,264) meters; 



Thermal range. From 5.1 to 5.44 C. 



History. Antedon valida was described and figured by Dr. P. H. Carpenter in 

 his report on the comatulids of the Challenger expedition published in 1888, his material 

 consisting of two mutilated individuals and one younger from station 214. Dr. Clemens 

 Hartlaub in 1895 discussed its systematic and bathymetrical relationships and compared 

 it with his new species Antedon (Thalassometra) agassizii. 



In my first revision of the old genus Antedon published in 1907 I placed valida'\n 

 the new genus Thalassomeira , and in my revision of the family Thalassomctridae pub- 

 lished in 1909 I listed Antedon valida among the species I was not able to allocate satis- 

 factorily. Later in 1909 I described Crotalometra eupedata from a single specimen from 

 Albatross station 5236. In the original description a young individual with arms 60 

 mm. long possessing one IIBr 4(3 + 4) series was, listed from station 5116. In 1911 I 

 compared C. eupedata with the new species C. propinqua. I said that in C. eupedata 

 the second and following brachials are thickly covered with minute 'spines, but they 

 are evenly distributed over the entire surface, lateral as well as dorsal, and they are 

 neither so large nor so long as in C. propinqua. In the same paper I determined as 

 Thalassometra (Oceanometra) annandalei the small specimen from Albatross station 

 5116 originally identified as C. eupedata. In my memoir on the crinoids of the Indian 



