616 PROCEEDINGS OF THE ACADEMY OF [NoV., 



Fig 5. — Ostrea antiguensis n. sp. Exterior of the deep valve of a rugose 

 specimen. Slightly enlarged above natural size. 



Fig. t). — Ostrea antiguensis n. sp. Interior of the flat valve, partly imbedded 

 in the limestone. This specimen shows the strongly reHexed margin of 

 this valve. The concentric markings are due to partial sihcification. 



Figs. ?, 8. — Turritella forresti n. sp. X 3. 



Fig. 9. — Scala {Sthenorhytis) antiguensis n. sp. Natural size. 



