Plate V. 



From specimens iu the author's collection, unless otherwise noted. 



1. Cidaroblastus parvus, n. s., showing one interambulacrum. 



2. Cribroblastus incisus, n. s. 



3. CrihrobJastus verrucosus, u. s., showing the interambulacrum. 



4. Globoblastus ornatus, n. s., showing iuterambulacral space. 



5. Interambulacrum of Globoblastus spatatus, n. s. 



6. PentremUes turbinatus, n. s., lateral view. 



7. Pentremites b7-adleyi Meek. — from specimen iu the Smithsonian Insti- 

 tution. 



8. Cribroblastus schucherti, n. s., magnified, — from specimen in the Smith- 

 sonian Institution. 



8a. The same specimen, natural size. 



9. Interambulacrum of Cribroblastus sanipsoni. 



10. Interambulacrum of Cribroblastus Itoemeri. 



11. Iuterambulacral space of Cribroblastus neglectus. 



12. Iuterambulacral space of Cribroblastus gramilosus. 



13. Interambulacrum of Cribroblastus jyisitm. 



14. Cribroblastus sayi, — from Shumard's type specimen. 



15. Outline of Cribroblastus potteri. 



16. Cribroblastus tenuistriatrts, n. s. 



17. Interambulacrum of Cribroblastus tenuis, n. s. 

 17a. Outline of specimen, natural size. 



18. Pentremites kirki, n. s., lateral view, — from specimen in the collection 

 of Mr. Kirk. 



