Puate 58, 
1-4, Plexechinus cinctus A. Ag.; Station 3424. 
Specimen 20 mm. in length, seen from the actinal side. 
. The same, seen from the abactinal side, 
The same, seen in profile facing the left posterior interambulacral area. 
. The same, end view, facing the anal system and odd posterior ambulacrum. 
5. Urechinus Naresianus A. Ag. 
Actinal view of specimen, 30 mm. in length; “Blake” Exp., 1878-79, Station 222, off 
St. Lucia. 
| 
\ 
\ 
f 
