A MONOGRAPH OF THE EXISTING CRINOIDS 151 



always remain slightly longer than broad. The distal segments bear a very short 

 dorsal spine. 



The radials are wholly concealed. The IBrj are partially visible, and are free 

 laterally. IIBr series arc always present, usually in the full number. IIIBr series 

 occur, but are very rare. 



The arms are 1 7-20 (usually 20) in number, about 50 mm. long. 



The mouth is slightly excentric. 



The color in alcohol is dark gray fading to white. 



Notes. — In the single specimen from Porcupine station 31, which was figured 

 by Carpenter in 1888, there are 20 arms; one of the IIBr series is lacking, but the 

 deficiency is made up by the occurrence of a single IIIBr series, which is externally 

 developed. A single cirrus stump with 4 segments remains. The cirrus segments 

 are unusually long, the fourth being four times as long as broad, or even rather 

 longer. 



Four specimens from Huxley station 13 were kindly sent me for examination by 

 Dr. E. J. Allen, the director of the Marine Biological Station at Plymouth, England. 

 In the largest the cirri are X, 13-14; the fourth segment is the longest, about four 

 times as long as the median width. There are 17 arms, which are about 50 mm. 

 long. Another specimen, much broken but apparently of the same size, has exactly 

 20 arms, all of the IIBr series being present. The other 2 are smaller, with 12 and 10 

 arms, respectively. 



Koehler noted that usually on the outer arms arising from each IIBr series the 

 first syzygy is between brachials 3+4, while on the inner arms it is between brachials 

 1 + 2; on these inner arms there is usually another syzygy between brachials 3 + 4, 

 but this may be absent. 



Localities. — Talisman station 72; off Las Huertas, Rio de Oro (lat. 25° 41' N., 

 long. 15° 56' W.); 410 meters; muddy sand and corals; July 9, 1883 [Parfait, 1884; de 

 Folin, 1887; Koehler and Vaney, 1910; A. H. Clark, 1911]. 



Dacia; northeast of the Seine Bank, west of the Straits of Gibraltar Qat. 34° 57' 

 N., long. 11° 57' W.); 974 meters [P. H. Carpenter, 1884, 1888; A. H. Clark, 1911]. 



Talisman station 10; southwest of Cape Spartel, Morocco (lat. 35° 26' N., long. 

 6° 49' W.); 717 meters; bottom temperature 12.0° C; mud; June 10, 1883 [Parfait, 

 1884; de Folin, 1887; Koehler and Vaney, 1910; A. H. Clark, 1911]. 



Porcupine station 31; west of the Straits of Gibraltar (lat. 35° 56' N., long. 7° 

 06' W.); 872 meters; bottom temperature 10.28° C; clay; August, 1870 [P. H. Car- 

 penter, 1884, 1888; A. H. Clark, 1911, 1913] (1, B. M.). 



Porcupine station 25; near Cape St. Vincent, southwestern Portugal (lat. 37° 

 11' N., long. 9° 07' W.); 684 meters; bottom temperature 11.95° C; rock; July 27, 

 1870 [P. H. Carpenter, 1888]. 



Travailleur; off Cape de Peflas, northern coast of Spain, west of Gijon; 400 

 meters; July 12, 1882 [Koehler and Vaney, 1910; A. H. Clark, 1911]. 



Caudan station 14; Bay of Biscay (lat. 44° 05' N., long. 4° 45' W.); 960 meters; 

 mud [Koehler, 1896].* 



< There seems to be some doubt regarding this station. In his preliminary report Professor Koehler gives station 14; but the 

 accompany data are those of station 4. In this final report he gives station 4, but with the depths of stations 2 and 3, and also sta- 

 tion 14, with the depth of station 4. 



