PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 823 



to this species. Compared with the type of A. sulcatus the centrodorsal is seen to be 

 somewhat more sharply pointed. There are the same interradial furrows. The prox- 

 imal intcrradial ridges, though prominent, are more rounded. The basals are visible 

 only in the interradial angles of the calyx, taking the form of low triangles with exces- 

 sively produced lateral apices which fail to meet the similarly produced apices of those 

 on either side. The radials are considerably shorter than those of the type of A. sul- 

 catus, and, when the specimen is viewed laterally, their dorsal profiles make consider- 

 ably more than, instead of less than, a right angle with each other. The elements of 

 the IBr series are proportionately shorter than those of the type of A. sulcatus, and the 

 brachials also are relatively slightly shorter. This gives the animal a more robust 

 and compact appearance. 



Localities. Siboga station 85; Makassar Strait, between Borneo and Celebes (lat. 

 036'30" S., long. 11929'30" E.); 724 meters; fine gray mud; June 17, 1899 [A. H. 

 Clark, 1912, 1918] (1, Amsterdam Mus.). 



Albatross station 5619; west of Halmahera (Gilolo); March Island (S.) bearing 

 S. 78 E., 7 miles distant (lat. 035'00" N., long. 12714'40" E.); 795 meters; fine 

 gray sand and mud; November 27, 1909 [A. H. Clark, 1918] (1, U.S.N.M., 36220). 



Challenger station 174C; near Kandavu, Fiji (lat. [about] 1906' S., long, [about] 

 17818' E.);411, 1115, or 384 meters; temperature (at 1115 meters) 3.89 C.; August 3, 

 1874 [P. H. Carpenter, 1882, 1888; A. H. Clark, 1913] (1, B.M.). Type locality. 



Geographical range. From Fiji to the Moluccas and Borneo. 



Bathymetrical range. From 724 (?384) to 795 (?1115) meters. 



Thermal range.- One record, 3.89 C. 



Remarks. Atelecrinus wyvilli was originally described by Carpenter in 1882 and 

 was redescribed and figured in 1888. The species was based on a single mutilated in- 

 dividual dredged by the Challenger at station 174C, which specimen I examined at the 

 British Museum in 1910. 



In 1912 I described as a new species Atelecrinus sulcatus from Siboga station 85. 

 This was assumed to differ from A. wyvilli in having the centrodorsal, basals, and radials 

 everywhere in intimate contact, there being no perisomic lacunae as in A. wyvilli, in 

 having the centrodorsal more sharply conical in form with interradial ridges proximally 

 passing into interradial furrows between the columns of cirrus sockets, in the greater 

 height of the lateral ridges bordering the cirrus sockets, and in the absence of notches 

 on the proximal border. 



The existence of perisomic lacunae between the basals and the centrodorsal in the 

 interradial angles in the type specimen of Atelecrinus wyvilli I believe to have been due 

 to a partial decalcification before it came into Carpenter's hands. As the other differ- 

 ences shown are all of minor importance there can be no doubt that Atelecrinus sulcatus 

 and A. wyvilli are conspecific. 



ATELECRINUS BALANO1DES P. H. Carpenter 



FIGURE 53 



[See also vol. 1, pt. 1, figs. 124(p. 193), 218(p. 243), 300(p. 264), 406(p. 311), 430(p. 321), pi. 8 figs. 



573-575; pt. 2, pi. 26, fig. 1163] 



Antedon cubensis PouRTALfcs, Bull. Mus. Comp. Zool., vol. 1, No. 11, 1869, p. 356 (in part; coast 

 of Cuba, 450 fms. [specimen described = Trichometra cubensis]); vol. 5, No. 9, 1879, p. 214 

 (Blake sta. 43, 339 fms.). 



