PLATE LXXXVI. 



Figures magnified 500 diameters. 



Fig. 1. COSCINODISCUS BIANOULATUS, A. S., Schm. At., 63, f. 13. Notting- 

 ham, Md. 

 " 2. ARMATUS, Grev. ; Schm. At., 67, f. 4. Richmond, 



Va. 



" 3. CRASPIDODISCUS COSCINODISCUS, Grun. ; Schm. At., 66, f. 4. Mon- 

 terey. 



' 4. " OCULUS IRIDIS, Ehrb.; Schm. A.t., 63, f. 3-7. 



" 5. CRASPIDODISCUS RHOMBICTJS, Grun.; Schm. At., 66, f. 13. Mon- 

 terey. " More likely a valve of Biddulphia than 

 a Craspidodiscus," H. L. S. 

 " 6. COSCINODISCUS HETEROPORUS, var. Grun.; Monterey. Schm. At., 



61, f. 5, 4. 



" 7. CRASPIDODISCUS ELEGANS, Ehrb.; Schm. At., 66, f. 1. Notting- 

 ham, Md. 



" 8. COSCINODISCUS, Ehrb. ; Schm. At.. 66, f. 3. Not- 



tingham, Md. 



" 9. COSCINODISCUS APICUL.ATUS, var. Ehrb. ; Schm. At., 64, f. 7-9. 



Richmond, Va. 



