PLATE 99, 
1-10. Abatus cavernosus Trosch.1 
U.S. ‘‘ Transit of Venus ” Exp., 1874-75, Kerguelen Islds., Dr. J. H. Kidder, U. S.N., 
National Museum. 
Young specimen with spines 1.6 mm. in length, taken from the breeding pouch, seen 
from the actinal side. 
The same as fig. 1, seen from the abactinal side. 
The same as fig. 1, denuded, seen from the actinal side. 
The same as fig. 2, denuded, seen from the abactinal side. 
The same as figs. 3, 4, seen facing the odd posterior interambulacrum. 
The abactinal system of fig. 4, magnified. 
The abactinal and anal systems of a specimen 1.9 mm. in length, magnified. 
Specimen 37 mm. in length, seen from the actinal side. 
The abactinal system of the same as fig. 8, magnified. 
. The anal system of the same specimen as fig. 8, magnified; it has the same number of 
anal plates in the outer row as in the young, fig. 7. 
1 Tripylus cayernosus Phil. 
ici clita 
