186 BULLETIN OF THE 



from the shape of the spines. For, certainly, if the present Bpecies had been 

 dredgetl without its two or three huge fan-shaped spines, it would have been 

 placed in the genus Dorocidaris, and have been undoubtedly referred to papil- 

 lata or to its Florida variety, D. abyssicola, while the isolated fan-shaped spines so 

 nearly identical in shape to those of the Jurassic Ehabdocidaris {Phyllacanthus 

 Br.) Yemus Des. would unhesitatingly have been referred to that genus. This 

 merely shows how little we are as yet able to determine, among the Cidaridie, 

 the value of either generic or specific characters, and we must possess far more 

 material from among the fossil species, especially in the way of spines associ- 

 ated with their tests, before we can make the much needed accurate revision of 

 the group of Cidaridce. In the few specimens dredged by Captain Sigsbee 

 there are none of the spines showing a passage from those considered thus far 

 as characteristic of Dorocidaris, and the peculiar fan-shaped spines, of which 

 there are from two to three on each specimen. 



The scrobicular ring is edged by a row of larger secondary tubercles, the 

 ambulacral area is flexuous, the poriferous zone nearly as broad as the median 

 ambulacral area, the primary tubercles are not crenulate, mammary boss large ; 

 the scrobicular areas well separated by the secondary and miliary tubercles, 

 not confluent even towards actinal extremity. In the specimen figured [nat- 

 ural size in Plate IV.] there are six primary tubercles in the interambulacral 

 area. The actinal area is smaller than the abactinal system. The ornamenta- 

 tion of the fan-shaped spines is similar to that of the cylindrical spines, the 

 rows of spinules becoming gradually changed into serrations spreading more 

 and more and becoming somewhat less prominent towards the extremity, rows 

 of smaller serrations being intercolated as the radicles spread. 



The broad end of the fan-shaped radicles is sometimes slightly concave. 

 When alive, these Echini were of a brilliant vermilion color. 



(Sigsbee.) Off Havana. Lat. 22° 11' N., Long. 82° 21' W. 243-450 fms. 



" Lat 22° 09' N., Long. 82° 23' W. 158 fms. 



" Off Havana. 242 fms. 



" Off Havana. 175 fms. 



" Off Havana. Lat. 22° 09' N., Long. 82° 21' W. 242 fins. 



A .spine closely allied to those of Goniocidaris bispinosa was brought up from 

 242 f\ithoras, in Lat. 22° 09' 30" N., Long. 82° 1 1' 30" W. Unfortunately no 

 test of Cidaris came u]i in the haul. This spine is different from those of any 

 of the specimens of Cidaris thus far dredged either by Mr. Pourtales or myself. 



Salenia varispina A. Ao. 

 I still retain this species in the genus Salenia, notwitlislandiiig Dr. Duncan 

 ha.s jiroposed to remove it to Peltastes. As I have already stated in the Re- 

 vision of the Echini, and in the Bull. M. C. Z. wlien first describing this species, 

 it differs somewhat from Salenia proper, but cerlaiidy it does not belong to tlie 

 grouj) of »SaieniJ(c to which Peltastes is associated, in which the subanal jdate is 

 placed directly opposite one of the genital plates, while i;i all the recent Sale- 



