Plate 12 



Figures 1. Heierostegina aniiUarum d'Ovhigny . (After type figure.) 



2. Heierostegina antillarum d'Orbigny. X 25. Tortugas, Fla. Young 

 stage. 

 3-6. Peneroplis pertusus (FoTskkl). Fig. 3 a, 6, Tortugas, Fla. X 60. a, 

 side view; b, apertural view. Fig. 4, Porto Rico. X 60. Fig. 

 5, a, b, Off Morro Castle, Havana Harbor, Cuba. X 60. a, 

 side view; b, apertural view. Fig. 6 a, b, "Peneroplis elegans 

 d'Orbigny." (After d'Orbigny.) a, side view; b, apertural view. 

 7-10. Pe7ieroplis carinatus d'Orhigny. Fig. 7 a, b. (After type figure.) a, 

 side view; b, apertural view. Fig. 8 a, b, Havana Harbor, Cuba. 

 X 60. a, side view; b, apertural view. Fig. 9, Tortugas, Fla. 

 X 60. Fig. 10 a, b, Montego Bay, Jamaica. X 60. a, side 

 view; b, apertural view. 



69 



