A MONOGRAPH OF THE EXISTING CRINOIDS 245 



Carpenter said that the number of arms in this species varies very considerably. 

 Several individuals have 20, but 14 to 16 is not an uncommon number, and two speci- 

 mens have only 11. IIIBr series occur in two specimens. In one the IIIBr series is 

 2(1 + 2) and in the other it is 3(2+3). 



The Albatross specimen from the Philippines, which is clinging to part of a stem of 

 Saracrinus acutus, has 20 arms 145 mm. long; of the ten IIBr series eight are 4(3 + 4) 

 and two are 2. The cirri are XXV, 22-23, with all the segments except the basal about 

 as long as broad. 



Localities. — Challenger station 170A; near Kermadec Islands (lat. 29°45' S., long. 

 178°11' W.); 1,152 meters; bottom temperature 4.17° C; volcanic mud; July 14, 1874 

 [von Graff, 1884, 1885; P. H. Carpenter, 1884, 1888; Braun, 1888; Springer, 1901; 

 Hutton, 1904; Minckert, 1905; Hamann, 1907; A. H. Clark, 1907, 1908, 1909, 1912, 

 1913, 1918; Hartlaub, 1912; Gislen, 1928, 1934] (3, B. M.). 



Challenger station 174 (B, C, or D); near Kandavu, Fiji (lat. about 19°06' S., 

 long, about 178°18' E.); 466, 1,115, or 384 meters; bottom temperature (at 1,115 

 meters) 3.89° C; coral mud; August 3, 1874 [von Graff, 1884, 1885; P. H. Carpenter, 

 1884, 1888; Braun, 1888; Springer, 1901; Minckert, 1905; Hamann, 1907; A. H. Clark, 

 1907, 1908, 1909, 1912, 1913, 1918; Hartlaub, 1912; Gislen, 1928, 1934] (3, M. C. Z., 

 268; B. M.). 



Philippine Islands; Albatross (1, U.S.N.M., 35896). 



Doubtful locality. — Challenger station 175; near Kandavu, Fiji (lat. 19°02' S., 

 long. 177°10' E.); 2,468 meters; bottom temperature 2.22° C; globigerina ooze; August 

 12, 1874 [von Graff, 1884, 1885; P. H. Carpenter, 1884, 1888; Braun, 1888; Springer, 

 1901; Minckert, 1905; Hamann, 1907, A. H. Clark, 1907, 1908, 1909, 1912, 1913, 1918; 

 Hartlaub, 1912; Gislen, 1928, 1934] (1, B.M.). 



Geographical range. — From the Philippine Islands to Fiji and the Kermadec 

 Islands, north of New Zealand. 



Bathymetrical range. — One definite and reliable record, 1,152 meters. 



Thermal range. — One definite record, 4.17° C. 



History. — Antedon inaequalis was first mentioned by Prof. Ludwig von Graff in his 

 memoir on the myzostomes of the Challenger Expedition published in 1884. The 

 name as given by him was a nomen nudum. In his report on the stalked crinoids of the 

 Siboga Expedition published in 1884 Dr. P.H. Carpenter cited Antedon (Poecilometra) 

 acoela and A. inaequalis, both from station where pentacrinites were abundant, as 

 good examples of comatulids with the pinnule ambulacra as fully as well or even better 

 plated than those of the pentacrinites. He gave a so-called specific formula for Antedon 

 inaequalis, which technically is the equivalent of a description, and figured the am- 

 bulacral skeleton of a pinnule. In 1885 Professor von Graff again listed Antedon in- 

 aequalis, and in his report on the comatulids of the Challenger Expedition Dr. Carpenter 

 in 1888 described and figured it in detail, listing 12 specimens from station 170A, 5 from 

 station 174 (B, C, or D), and one broken specimen from station 175, a locality he 

 regarded as doubtful. 



Braun in 1888 cited Antedon inaequalis as a host for certain myzostomes; Springer 

 in his study of Uintacrinus published in 1901 mentioned the tegminal plates; Hutton 

 in 1904 listed it as a New Zealand species; Minckert in 1905 discussed the arrangement 

 of the syzygies; and it was listed by Hamann in 1907. 



