PLATE XXII. 



Osirca inti/rva, n. s/>. 

 Fig. I. Exterior of right valve. 

 Fig. 3. Exterior of right valve. 

 Fig. 5. Interior of right valve. 

 Fig. 6. Exterior of right valve. 



Osirea atiriiuata. n. sp. 

 Fig. 2. Exterior right valve. 

 Fig. 4. Interior of right valve. 



Osirca lata, n. sp. 

 Fig. 7. Exterior of right valve, adult. 

 Fig. 8. Exterior of right valve, young. 

 Fig. g. Exterior of right valve, young. 

 Fig. 10. Interior of right valve, adult. 



Ostreaje7i>e/lensis, n. sp. 

 Fig. II. Interior of right valve. 



