PLATE VIII. 



GoNIASTER MAMMILLA!' A Gabb (p. 42). 

 Acad. Nat. Sci. Philadelphia 1457, type. 



Figure la-g. Various sides of four different plates, X 2. 

 lh. Surface of plate, X 20. 



Figure 2a. Top of plate. 

 2b. Side of plate. 



Pentaceros asperulus Clark (p. 42). 

 Johns Hopkins Univ. T 3014, type. 



Ophioglypha texana Clark (p. 43). 

 U. S. Nat. Mus. 21884, type. 



Figure 3a. Oral surface. 



3b. Portion of aboral surface, X 5. 

 3c. Portion of oral surface, X 5. 



Ophioglypha bridgerensis (Meek) (p. 43) 

 U. S. Nat. Mus. 7820, type. 



Figure 4a. Skeleton, natural size. 



4b. Portion of the upper surface. 



