188 ۱ BULLETIN OF THE 
ing the flat papilla, are arranged vertically in open ares round them ; and these 
ares, running together along the median interambulacral line, form two wavy 
vertical rows of tubercles, closely packed, which gives to the median interam- 
bulacral area a somewhat sunken aspect, as in Goniocidaris. The ambulacral 
tubercles, as in Salenia varispina, resemble in their arrangement those of Hema- 
cidaris, forming two vertical rows, being larger near ambitus and gradually 
diminishing rapidly towards actinostome and gradually towards apical sys- 
tem. The largest ambulacral tubercles are not larger than the secondary, 
surrounding the primaries in the interambulacral area. Ambulacral zone 
narrow, pores arranged in a slightly undulating line, irregularly following the 
outline of the primary plates in the interambulacral area. 
Off Havana. Lat. 22° 09 N., Long. 82° 21/30" W. 175 fms. ; 242 fms. 
(Sigsbee.) 
Arbacia punctulata ۰ 
Station No. 36. Lat. 23° 18 N., Long. 89° 10 W. 84 fms. 
*  * 39, 16 miles north of Zoblos Islands, 14 fms. 
Colopleurus floridanus A. Aa. 
Station No. 32. Lat. 23° 52 N., Long. 88° 05! W. 95 fms. 
ya * 45. Lat. 25° 29 N., Long. 84° 217 W. 101 fms. 
ij * 93, Lat. 23° 01 N., Long. 83? 14 W. 190 fms. 
* & 91, Lat. 23? 02' N., Long. 83? 197 W. 287 fms. 
" * 9, 4miles from Morro Light. 805 fms. 
e * 40, Lat. 23° 26! N., Long. 84? 02/ W. 1323 fms. 
(Sigsbee.) Off Havana. Lat. 22? 09' 151 N., Long. 82° 21! W. 177 fms, 
i Off Havana. Lat. 22° 09! 30’ N., Long. 82? 117 307 W. 242 fms. 
Diadema setosum Gray. 
Littoral Bahia Honda, Marianao, 
Aspidodiadema microtuberculatum A. Ac. gen. et spec. nov. 
A number of young specimens of Aspidodiadema microtuberculatum A. Ag. 
[The adult of this will be figured in Challenger Echini, Plate VIII. Figs. 10-16.) 
There was no series of young specimens among the Challenger Echini The 
small plates on the anal system, as characteristic of this species, are found on 
the smallest specimens collected by the “ Blake.” 
Station No. 41. Lat. 23° 42’ N., Long. 83° 13 W. 860 fms. 
* °“ 99, Lat. 24° 30 N., Long. 84° 05! W. 955 fms. 
»  €«* 33, Lat, 24° 14 N., Long. 88° 58/ W. 1568 fms. 
Echinometra subangularis Desmi. 
Littoral Bahia Honda, Havana. 
Yucatan Bank, in all dredgings less than 14 fathoms, 
