46 Trans. Acad. Sci. of St. Louis. 



7. Genus Globoblastus. 



General form of body globose or elliptical. Ambulacrum 

 narrow and linear, extending almost over the whole surface 

 of the body. Central opening never closed except by am- 

 bulacral integument. Genital openings five, piercing the 

 deltoid pieces and bifurcating in the substance of the shell 

 toward the interior. Anal opening large to receive the anal 

 tube which is on the posterior side in the center of this bi- 

 furcation, making this opening twice as large as the others. 

 Deltoid pieces of variable size, in some species occupying 

 almost half of the interambulacral surface. Base small and 

 very much depressed. Column round. 



My reason for not using the name Granatocrinus is suffici- 

 ently explained in the foregoing pages. Besides its ending 

 in ' ' crinus ' ' the genus contains so many different forms among 

 the various authors, that it is apt to be misleading to the 

 student. The name Orbitremites , Austin, which Mr. Bather 

 adopted as the one which should have priority, is only a name 

 without a generic diagnosis, and therefore equally inadequate. 

 To avoid all confusion I propose the above used name. The 

 genus includes the following species : — 



1. Globoblastus norwoodi, Owen and Shumard. Burling- 

 ton limestone. 

 Pentremites norwoodi, Owen and Shumard. 

 Granatocrinus norwoodi, Shumard. 

 Orbitremites norwoodi, F. A. Bather. 



8. Genus Codonites. 



General form of the body, bell or star-shaped. Ambulacra 

 narrow and linear, extending out and downward, thus giving a 

 more or less star-shaped appearance to the summit. Central 

 opening very small and usually covered by the ambulacral 

 integument. Genital openings, long slits at each side of the 

 ambulacrum. Anal opening large and lateral. Base, funnel- 

 shaped. Column round and large for the size of the specimen 



