Hambach — Revision of the Blastoideae. 51 



lateral pieces have a sinus at least ^ inch longer, and, con- 

 sequently, a longer ambulacrum. The fifth fork piece is 

 shortest, being only half as long as the others, but much 

 wider and rests upon the upper edges of the two large basals. 

 This piece has a very broad but short sinus, and correspond- 

 ing ambulacrum. Deltoids five and small. Ambulacra nar- 

 row and linear; the fifth broad and triangular and lying 

 horizontally on the summit. Mouth central. No anal open- 

 ing visible. Genital openings five, each one divided by a 

 septum. I consider the side with the short and broad 

 ambulacrum the posterior part of the calyx. No column. 

 Devonian. 



1. Eleutheroblastus canedayi, B. F. Shumard and L. P. 



Yandell. Devonian. 

 Eleutherocrinus canedayi^ Shuraard and Yaudell. 



2. Eleutheroblastus whitfieldi, Hall. Hamilton group. 

 Eleutherocrinus whitfieldi, Hall. 



The following species are insufiiciently described and illus- 

 trated to be identified and classified with certainty : — 



Blastoidocriuus carchariaedens, BillingSo 

 Pentremites decussatus, Shumard. 

 Pentremites raaia, Hall. 

 Pentremites leda. Hall. 

 Pentremites calyce, Hall. 

 Pentremites lycories, Hall. 

 Pentremites whitei, Hall. 

 Codaster blairi, Miller and Gurle3^ 

 Codaster jessieae, Miller and Gurley. 

 Nucleocrinus venustus, Miller and Gurley. 

 Granatocrinus sphaeroidalis. Miller and Gurley. 

 Granatocrincus Avinslowi, Miller and Gurley. 

 Granatocrinus aplatus, Rowley and Hare. 

 Granatocrinus concinnulus, Rowley and Hare. 

 Granatocrinus pyriformis, Rowley and Hare. 

 Granatocrinus exiguus, Rowley and Hare. 



