PLATE VII. 

 Uintacrinus socialis Grinnell (p. 36). 



U. S. Nat. Mus. 8044. 

 Figure la. Lateral view of the test. 

 lb. Test showing pinules. 

 lc. Part of test, X 2. 



Maesupites americantts Springer (p. 39). 



Figure 2a. Side of calyx, with bases of arms, and a strong interbrachial passing in between them. 

 2b. Base of the same. 



Collection of Frederick Brawn. 

 3. Infrabasal plate of much larger specimen. 

 Collection of Frank Springer. 



Rhizocrixus alabamensis (De Loriol) (p. 39). 



Cincinnati Soc. Nat. Hist., type. 

 Figure 4a. Side of the basal cone. 



4b. Upper surface of the same. 

 4c. Lower surface of the same. 



Rhizocrixus cylindricus Weller (p. 40). 

 New Jersey Geol. Survey, type. 



Figure 5a. Lateral view of a complete body, X 2. 



5b-g. Various sides of several column joints, probably belonging to this species (enlarged). Johns Hopkins 

 Univ. 



AsTROPECTEN (?) MONTANUS Douglas (p. 41). 



Carnegie Mus. 601, type. 

 Figure 6. Impression of skeleton. 



Pentagonaster browni Weller (p. 41). 



Walker Mus., Chicago, type. 

 Figure 7. Dorsal surface (?). 

 236 



