144 NATURAL HISTORY BULLETIN 



or both sides of the first, between the outer angles of the four 

 plates, but not always in the same angles. The inferomarginal 

 spines are surrounded by basal secondary spines as in the larger 

 specimens. (See plate xvii, figure 1.) 



The spines of the jaws and adambulacral plates are essen- 

 tially the same as in the older specimen described above ; part of 

 the adambulacral plates even have two larger spines on the 

 actinal face. 



Interactinal row of plates is single, having two larger and 

 two very small plates. Two or three small pectinate pedicel- 

 lariae have already developed on each area. 



This is undoubtedly young. In the strong spinulation of the 

 inferomarginal plates and the group of several secondary spines 

 below the marginal one it is much like C. eckinnlatus, but the 

 latter has a group of long spines on the disk; a different ar- 

 rangement of papulffi ; relatively coarser protopaxill^, with few- 

 er and smaller central spinelets. It seems hardly probable that it 

 can be the young of echimdatus, for there is no great difference 

 in size between this and some of the latter, nor is there any 

 reason to think that the arrangement of the papular pores can 

 change from the condition characteristic of Pectinaster to that 

 of CJieiraster, especially in specimens nearly of the same size. 



Whether this species ever develops large spines on the disk, 

 when older, I cannot say. I have seen none with such spines. 



This species, as listed by Perrier, was taken by the Blake Ex- 

 pedition at about 42 stations (not all recorded by Perrier), 

 nearly all were between 73 and 314 fathoms. One was taken 

 in 805 fathoms, off Havana; one in 611 fathoms, off Dominica, 

 station 175 ; one in 1,030 fathoms, off Martinique, station 196. 



Although I studied a large number of specimens of this species 

 in the Blake collection, I have no memoranda in respect to these 

 three from great depths. Perhaps some of them may be distinct. 

 Perrier himself makes no remark about either, except the first, 

 from 805 fathoms, which he says is a large specimen without 

 pedicellarige. (Compare my C. planus.) 



The Blake localities are nearly all among the Lesser Antilles. 

 Three are in the Gulf of Mexico, off West Florida and Alabama, 

 in 84 to 229 fathoms. I have no data sufficient to list all the 



