86 PROCEEDINGS OF THE ACADEMY OF [1895. 



Fig. 3a Smaller individual of the same species. 



Fig. 4. Periploma collardi nov. sp. 



Fig. 5. Corbula aldrichi, var. smithvillensis nov. var. 



Fig. 5a The same, lesser value. 



Fig. 6. Martesia texana nov. sp. 



Fig. 7. Ringicula trapaquara uov. sp. 



Fig. 8. Volvula t smithvillensis nov. sp. 



Fig. 9. Cyliehnella atysopsis nov. sp. 



Fig. 9a The specimen labelled " Volvula minutissima" in the 



collection of the Academy. 

 Fig. 10. Terebra texagyra nov. sp. 

 Fig. 11. Terebra houstonia nov. sp. 



Plate 4. 



Fig. 1. Terebra houstonia var. 



Fig. 2. Conns smithvillensis nov. sp. 



Fig. 3. Pleurotoma enstricrina uov. sp. 



Fig. 4. PL (Pleurotomella) anacona nov. sp. 



Fig. 5. PL (Surcula) gabbi Conrad. 



Fig. 6. PI. (Surcula) moorei Gabb. 



Fig. 6a A somewhat larger, more carinated specimen. 



Fig. 6b A strongly denticulate specimen. 



Fig. 7. Pleurotoma beadata nov. sp. 



Fig. 8. Pleurotoma vaughani nov. sp. 



Fig. 9. Pleurotoma huppertzi nov. sp. 



Fig. 10. PL huppertzi, var. penrosei nov. var. 



Plate 5. 



Fig. 1. Pleurotoma leoncola nov. sp. 

 Fig. 2. PL ( Drill 'id) dumblei nov. sp. 



PL (Drillia) dipta nov. sp. 



PL {Drillia) nodocarinata Gabb. 



PL (Drillia) prosseri nov. sp. 



PL (Drillia) hellogi Gabb. 



PL (Drillia) texaeona nom. mut. 



PL (Drillia) texanopsis nov. sp. 

 Fig. 9. Pleurotoma insignifica Heilp. 

 Fig. 10. 27. ( Mangilia) infans Mr. 



