168 
The test is low, as in albocinctus of corresponding sizes (comp. 
measurements). The tuberculation is rather coarse; the secondary 
tubercles are considerably smaller than the primary ones, but fairly 
numerous, leaving no naked median Space, while in specimens of 
a corresponding size of albocinctus they are as yet few, the median 
Figs. 12-13. Interambulacra of Ps. variegatus (12) and of a young Ps. albocinctus , 
of 8 mm diameter (13). 15 /i. 
Figs. 14-15. Ambulacra of Ps. variegatus (14) and of a young Ps. albocinctus, 
8 mm (15). 16 /i. 
part of both areas remaining bare. The arrangement of the second¬ 
ary tubercles is somewhat irregular and does not convey the im- 
pression that the tubercles of the adult specimens will form trans¬ 
verse series. There is a faint indication of the same sort of crenu- 
lation as in albocinctus. (Figs. 12—15). 
Each genital plate carries one prominent tubercle at the inner 
edge. All the oculars are exsert, but Oc. 1 reaches fairly near to 
the edge of the periproct, which appears to indicate that in the 
adult specimens it may be insert. The central plate is large, smooth. 
