

Plate 99. 

 1-10. Abatus cavernosus Trosch.^ 



U. S. '^Transit of Venus " Exp., 1874-75, Kerguelen Islds., Dr. J. H. Kidder, U. S. X., 

 Natioual Museum. 



1. Young specimen witli spines 1.6 mm. in length, taken from the breeding pouch, seen 



from the actinal side. 



2. The same as fig. 1, seen from tlie abactinal side. 



3. The same as fig. 1, denuded, seen from the actinal side. 



4. The same as fig. 2, denuded, seen from the abactinal side. 



5. The same as figs. 3, 4, seen facing the odd posterior interambulaerum. 



6. The abactinal sj'stem of fig. 4, magnified. 



7. The abactinal and anal systems of a specimen 1.9 mm. in length, magnified. 



8. Specimen 37 mm. in length, seen from the actinal side. 



9. The abactinal system of the same as fig. 8, magnified. * 



10. 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. 



^ Tripjlus caveruosus Phil. 



