DESCBIPTION OF PLATE X — CONTINUED. 517 



Page. 

 Fig. 8. Loxonema ? peoriense 460 



A very imperfect specimen partially embedded in rocl:. 



Side view. 



Rico formation: Scotch Creek, Rico quadrangle (station 2342). 



Figs. 9 and 9a. Euconispika taggaeti 453 



The type specimen of this fine species. It is somewhat deformed by pressure. The 



figures are copied from White, and slightly enlarged. 

 Fig. 9. Side view. 



9a. Apertural view. In this figure the apex is somewhat tilted away from tlie 

 observer. 

 Weber shales; Near mouth of canyon of Four Mile Creek, Leadville district (station 2281 ). 



Figs. 10 to 10b. Platellostium ourayense 471 



The typical specimen of this species/ which I have been enabled to figure through the 



courtesy of the department of geology of the University of Chicago. 

 Fig. 10. Dorsal view. This figure shows the character of the striation, which is some- 

 what different on the two sides of the band. 

 10a. Side view.' 

 10b. Side view enlarged. 

 Hermoaa formation (?): Ouray, Colorado. 



Fig. 11. Phillipsi A trinucleata 478 



A cephalic shield referred to this species. 



Specimen seen from above. 



Weber formation: Empire Hill, Leadville district (station 2265). 



Fig. 12. Phillipsia tkinucleata 478 



A pygidium from the same locality as the cephalic shield of fig. 11. 



Specimen ,«een from above. 



Weber formation: Empire Hill, Leadville district (station 2265). 



