1895.] NATURAL SCIENCES OF PHILADELPHIA. 61 



is not quite so great in comparison with the whole length of the 

 shell. 



This species is characterized mainly by its slim spire, blunt apex, 

 and raised line at the suture. 



Localities. Hurricane Bayou, Marsters' Surv., near Crockett, 

 Houston Co., and, according to Gabb, "Wheelock, Tex." 



Geological horizon. Lower Claiborne Eocene. 



Type. Academy of Natural Sciences of Philadelphia. 



PI. (Drillia) texacona, nom. mut. PI. 5, fig. 7. 

 Drillia texana Con. non Gabb, Amer. Jr. Conch., vol. 1, 1865, p. 143. 



Localities. Little Brazos River, near iron bridge on Mosley's 

 Ferry road; Cedar Creek, Wheelock League, Robertson Co.; 

 Jones' farm, Hurricane Bayou, Houston Co.; Elm Creek, Lee Co., 

 Tex. 



Geological horizon. Lower Claiborne Eocene. 



Type. Probably the specimens in the Academy of Natural Sci- 

 ences of Philadelphia. 

 PI. (Drillia) texanopsis nov. sp. PI. 5, fig. 8. 



Specific characterization. Form in general as figured, though the 

 specimen drawn was young; whorls about 12; 15 smooth, tapering 

 to a sharp point ; other spiral whorls scarcely distinguishable from 

 those of texacona, body whorl with faint revolving striae, becoming 

 stronger below; beak long, straight. 



On the last -or body whorl the costse often become obsolete and a 

 more or less distinct carina is developed ; above which, or between 

 which and the suture, the shoulder is slightly concave. 



Localities. Smithville, Bastrop Co.; Bombshell Bluff, Colorado 

 River, Tex. 



Geological horizon. Lower Claiborne Eocene. 



Type. Texas State Museum. 



Pleurotoma insignifica Heilp. PI. 5, fig. 9. 



Fusus nanus Lea, Cont. to Geol., 1833, p. 150, pi. 5, fig. 155. 



Pleurotoma insignifica Heilp., Proc. Ac. Nat. Sci. Phila., 1879, p. 213, pi. 13, 



fig. 9. 

 Pleiirotoma nana Meyer, Bericht iiber die Senckenbergische Xaturforschende 



Gesellschaft in Frankfurt, a. M. Sender- Ausdruck. 1887, p. 18. 

 Fusus (Lirofusus) naiijts Ue Greg., Mon. Faun. Eoc. Ala., p. 87. 



This species shows considerable variation at Claiborne. As a rule 

 the larger specimens are not so strongly carinated as the specimen 

 herewith illustrated. The type specimen of Fusus nanus at the 

 Philadelphia Academy has been compared with the Texan form and 



