188 BULLETIN OF THE 



ing the flat papillae, are arranged vertically in open arcs round them ; and these 

 arcs, running together along the median interainbulacral lino, 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 Hemi- 

 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 Gray. 



Station No. 36. Lat. 23° 13' N., Long. 89° 10' W. 84 fms. 

 " " 39. 16 miles north of Zoblos Islands. 14 fms. 



CcBlopleurus floridanus A. Ao. 



Station No. 32. Lat. 23° 52' N., Long. 88° 05' W. 95 fms. 



" " 45. Lat. 25° 33' N., Long. 84° 21' W. 101 fms. 



« " 23. Lat. 23° 01' N., Long. 83° 14' W. 190 fms. 



« « 21. Lat. 23° 02' N., Long. 83° 13' W. 287 fms. 



" " 2. 4 miles from Morro Light. 805 fms. 



" " 40. Lat. 23° 26' N., Long. 84° 02' W. 1323 fms. 



(Sigsbee.) Off Havana. Lat. 22° 09' 15" N., Long. 82° 21' W. 177 fms. 



" Off Havana. Lat. 22° 09' 30" N., Long. 82° 11' 30" W. 242 fms. 



Diadema setosum Gray. 

 Littoral Bahia Honda, Marianao. 



Aspidodiadema microtuberculatum A. Ao. gen. ct 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. 800 fms. 

 " " 29. Lat. 24° 30' N., Long. 84° 05' W. 955 fms. 

 " " 33. Lat. 24° 1 1' N., Long. 88° 58' W. 1568 fms. 



Echinometra subangularis Desml. 



Littoral Bahia Honda, Havana. 



Yucatan Bank, in all dredgings less than 14 fathoms. 



