PLATE XLII. 



Fig. I. P'crticordin (Haliris) iiiississippicnsis DaW; Wahtubbee Eocene of Mississippi ; 



Ion. 5.6 mm. 

 Fig. 2. Venus Laiigdoni Dall ; Chipola marl; interior of left valve; Ion. 88 mm. 

 Fig. 3. Venus latilirata Conrad; Pliocene of ihe Waccamaw beds, South Carolina; 



dorsal view ; Ion. 34 mm. 

 Fig. 4. Venus (Anaitis) Bunisii Dall; Oligocene of the Chipola River, Florida; form 



with the concentric ribs confluent ; Ion. 34 mm. 

 Fig. 5. Venus {Anaitis) uloeynia Dall; Miocene of Alum Bluff, Florida; adult; 

 Ion. 45 mm. 

 Sa. The same, young shell ; Ion. 18 mm. 



Eitnaticina caractacus Dall; Oligocene sands of Oak Grove, Florida; alt. 7.1 mm. 



Venus Laiigdoni Dall, dorsal view ; Ion. 88 mm. 



Crassatellifes psychoptcrns Dall; Wahtubbee Eocene of Mississippi; Ion. 20.2 



mm. 

 The same ; external view of the same valve. 



Venus (Anomaloeardia) caloosana Dall; Pliocene of the Caloosahatchie marls, 

 Florida ; Ion. 21 mm. 

 Fig. II. Venus (Anaitis) Burnsii Dall; Chipola beds; form with the concentric ribs 



distinct. 

 Fig. 12. Venus Langdoni Dall; Chipola beds; view of exterior of left valve; a, shows 

 one of the concentric lamellx complete, the others are more or less de- 

 fective through chipping ; Ion. 88 mm. 

 Fig. 13. Verticordia eoecnensis Langdon ; Wahtubbee Eocene of Clarke County, Mis- 

 sissippi ; internal view of left valve ; Ion. 4 mm. 

 Fig. 14. The same, external view of the same valve. 



1 198 



