ON JAPANESE EUDIOCRINOIDS— CLARK. 573 



have about the same habitat so far as temperature and depth are con- 

 cerned, although it is worthy of note that at the stations with tlie least 

 depth and highest temperatures £". jajxm iats alone was found. Another 

 interesting fact Is that at the stations where both species occurred 

 together the examples of each were of practically the same size; where 

 J^. va/'ianj^was large and robust £". japoju'et/s was also large and robust, 

 and, conversely, where £". 'varimis was small E. ja'poniciis was also 

 small, thus suggesting that the same factors iniiuenced the growth of 

 each in the same degree. 



Eudiocr'uius japoniciLS can be distinguished at a glance from E. 

 rarians by its more ro])ust and massive appearance. In color the two 

 species are practically the same. 



EUDIOCRINUS TUBERCULATUS Clark, new species. 



In general similar to E. jaj)onicus, but even more robust, with the 

 junctions of the tirst eight or ten brachials strongly tubercular. The 

 tubercle between the tirst two is in the median line; those on the 

 following joints lie alternately on either side of the arm. 



The greatest ditference between this species and E. japonlcus is in 

 the character of the cirri; in E. tuherculatus they are but 18 nun. in 

 length consisting of about 17 joints, although the specimens are rather 

 larger than any of my E. japonicus^ in the largest of which the cirri 

 reach 54 mm. in length. 



Station No. 3661.- 0& Uki Shima, Gulf of Tokyo, 169 fathoms; 

 bottom temperature, 48"^ F.; bottom, mud and pebbles. October 13, 

 1896. 



Ti/pe.^Cat. No. 22604 U.S.N.M. from this station. 



Three specimens. 



The following is a list of the known recent species of Endioerinus: 



EUDIOCRINUS P. H. Carpenter. 



1882. Eudiocrinus P. H. Carpenter, Jour. Linn. Soo. (Zool.), XVI, p. 493 

 (first mentioned p. 488); new name for Ophiocrinus Semper, preoccupied. 



Type. — Ophiocrinus indiviHUH Semper. 



EUDIOCRINUS ATLANTICUS Perrier. 



* 



1883. Eudiocrhws atlantlcus Perrier, Coniptes Rendus, XCVI, p. 725. 



Type-locality. — Gulf of Gascony, 896 meters. French steamship 



TravaUleur. 



EUDIOCRINUS GRANULATUS Bell. 



1894. Eudiocrinus yranuluius Bell, Proc. Zool. Soc, 1894, j). 397, pi. xxiii (first 

 mentioned p. 396). 



Type-locality. — Macclestield Bank, west of Luzon, Philippine Islands; 

 34-40 fathoms. H. M. S. Egerla. 



