OE LITTLE-EiyrOWX COMATULJl. 497 



two foUowiug ones beiug more or less expauded towards tlie 

 dorsal side. Tliis is most marked in the lowest pinnules of tlie 

 larger specimen. The later pinnule-joints are elongated, but 

 very much more slender in the small specimen than in the larger 

 one. The lower pinnules appear to be the longer, containing 

 more numerous, though shorter joints. That on the fourth bra- 

 chial in the larger specimen is almost 12 mm. long, and consists 

 of twenty-five joints. 



Disk 5 mm. wide. It bears numerous calcareous nodules, but 

 the brachial ambulacra only have delicate rods and networks of 

 limestone at their sides. Sacculi are present, though small, in- 

 conspicuous, and few in number. Skeleton white. 



The smaller specimen is 3^ mm., and the larger 4| mm. across 

 the centrodorsal. 



H.M.S.' Challenger.' 18/4. Station 205. Lat. 16°42' N. ; Long, lig'^ 

 22' E. Depth 1050 fms. Grey ooze. 



This is a very singular species. The two mutilated individuals 

 described above resemble one another very closely in the charac- 

 ters of the calyx and arms, while the cirri and pinnules vary 

 considerably. In the smaller one I can find no certain trace of 

 any but the long-jointed cirri like those of E. Semperl and 

 E,japomcus. But in the larger form,Avhich retains the bases of 

 two, if not more, of these, the majority of the cirri consist of 

 numerous short joints but little longer than wide. 



In the smaller form, again, most of the pinnules are quite 

 slender and delicate, with somewhat glassy joints which are 

 twice, or more than twice, as long as wide. But in the larger 

 one they are usually considerably stouter and more massive, 

 though one or two of the lowest pinnules are much more slender 

 than their fellows, and somewhat resemble those of the smaller 

 individual. The variation in these pinnule characters and the 

 striking dimorphism of the cirri are the more remarkable, as 

 in most Comatulce the peculiarities of these organs are of consi- 

 derable value in the distinction of species. 



8. EtTDiocEiNUS Semperi, n. sp. 



Centrodorsal small, nearly hemispherical, or somewhat flat- 

 tened, thickly covered with cirrus-sockets except at the dorsal 

 pole. These have strongly marked articular rims around the 

 opening of the central canal, and are from twenty to thirty in 

 number. Cirri probably 30 mm. long and tapering, of 21-f- 



37* 



