Plate 97. 



1-5. Paleopneustes hystrix A. Ag. ; "Blake," 1878-79, 

 Station 157, off ^Nloiitserrat 120 t'ms. 



1. Denuded specimen, 135 mm, in length, seen from the actinal side. 



2. Abactinal system of same. 



3. Anal system of same. 



4. Primary interambulacral spine of the actinal side. 



5. Primary interambulacral spine of the abactinal side. 



M 



