256 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



and will be described in the author's monograph of the Cidaridae 

 under the name of Histocidaris recurvata) that it is out of the ques- 

 tion simply to identify it with that species, for the present, at least. 

 Very probably it represents a separate species, but on the basis of 

 the single evidently young specimen at hand it would seem undesir- 

 able to establish a new species in this rather perplexing genus. I 

 therefore prefer to leave it unidentified, merely calling attention to 

 its characters and leaving the question of its specific status for future 

 decision when more satisfactory material will be available. 



Genus PRIONOCIDARIS A. Agassiz 



PRIONOCIDARIS GLANDULOSA (de Meijere) 



Cidaris (Cidaris) glandulosa de Meijere, Die Echinoidea der Siboga-FiXped., 



1904, p. 13, pi. l,figs. 5,6. 

 Stephanocidaris glandulosa H. L. Clark, Bull. Mus. Comp. Zool., vol. 51, 



No. 7, 1907, p. 194. 

 Prionocidaris glandulosa Th. Mortensen, Deutsche Sudpolar-Exped., 1901- 



1903, vol. 11, pt. 1, 1909, pp. 51, 53. 



Localities. — Station 5140; vicinity of Jolo (Sulu) ; Jolo Light bearing 

 S. 33° W., 6.1 miles distant Gat. 6° 08' 45" N., long. 121° 03' 00" 

 E.); 139 meters; fine coral sand; February 14, 1908 (1 specimen, Cat. 

 No. E. 1276, U.S.N.M.). 



Station 5442; west coast of Luzon; San Fernando Point Light bear- 

 ing N. 39° E.,8.4 miles distant (lat. 16° 30' 36" N., long. 120° 11' 

 06" E.) ; 82 meters; coral sand; May 10, 1909 (1 specimen, Cat. No. E. 

 1370,U.S.N.M.). 



Remarks. — The specimens agree very closely with the typical glan- 

 dulosa except for the fact that not a single large globiferous pedicel- 

 laria is to be observed on them, while in the typical form these were 

 found in such great numbers as to give the incentive for the name 

 "glandulosa." It is, however, a well-known fact that the large glob- 

 iferous pedicellariae especially are subject to great variation in their 

 occurrence in cidarids, so that no stress at all can be laid on this 

 peculiarity in the present specimens. 



In the larger specimen, which is from station 5140 and measures 

 24 mm. in horizontal diameter, some of the primary spines are rather 

 distinctly curved upward; in the smaller specimen this feature is 

 hardly indicated. The oral primaries are distinctly "capped" in 

 the larger specimen, less so in the smaller. The primaries of the 

 larger specimen are partly covered with foreign organism (serpulids, 

 barnacles, etc.). This specimen is also remarkable in its color, the 

 denuded test showing some large violet-purple patches in the median 

 interambulacral area. The interporiferous zone of the ambulacra 

 is deep purple. In the smaller specimen, which is from station 5442 

 and measures 18 mm. in horizontal diameter, this color is much less 

 pronounced. 



