56 PROCEEDINGS OF THE ACADEMY OF [1895. 



stated by Meyer, a Pleurotomoid shell. C. parvus of H. C. Lea is 

 evidently the young of sauridens Con. 



Locality. Smithville, Bastrop Co., Tex. 



Type. Texas State Museum. 



Genus PLEUROTOMA. 

 Pleurotoma enstriorina nov. sp. PI. 4, fig. 3. 



Specific characterization. General form and size as indicated by 

 the figure; whorls 10; nuclear whorls 1, 2, 3, 4 smooth, 5 costate, 

 whorls 6, 7, 8, 9 ornamented by (a) a crenulated narrow band below 

 the suture, (b) a narrow concave space in which there are two or 

 three fine but distinct spiral striae, (c) a broad costate band, (d) a 

 spiral line or two, body whorl marked below the costate band by 

 coarse spiral lines and with more or less apparent lines of growth. 



Locality. Smithville, Bastrop Co., Tex. 



Geological horizon. Lower Claiborne Eocene. 



Figured Type. Texas State Museum. 



PI. (Pleurotomella) anacona nov. sp. PI. 4, fig. 4. 



Specific characterization. General form as figured; whorls 8; 1 

 nearly or quite smooth; 2, 3, 4, 5, 6 with (a) a broad slightly con- 

 cave band showing very faint spiral strise and a deep retral curve 

 in the longitudinal strise, (b) a slight basal carina with two or three 

 strong spiral lines and rather faint, slightly oblique nodules; body 

 whorl with more or less alternating coarse and fine spiral lines from 

 the nodose carina to the end of the beak. 



Localities. Well at Elgin, northeast corner of Bastrop County; 

 Smiley' s Bluff, Brazos River, 2 miles above Pond Creek, and per- 

 haps on Rocky Cedar Creek, 5 miles west of Elmo. 



Geological horizon. Midway Eocene. 



Type. Texas State Museum. 



PI. (Surcula) gabbi Con. PI. 4, fig. 5. 



Surcula gabbi Con., Am. Jour. Conch., vol. 1, 1865, p. 142, pi. 11, fig. 5. 

 Pleurotoma platyzona Heilp., Proc. U. 8. Nat. Mus., 1880, p. 150, "fig. 3. 

 Pleurotoma alveata Con., Coll. Ac. Nat. Sci. Phila. 



In adult specimens there are 12 whorls; of the 5 nuclear, 1, 2, 

 and 3 are smooth, while 4 and 5 are prominently costate. Heilprin's 

 platyzona is an eroded specimen of this species. 



This is one of the commonest fossils in the Texan Lower Claiborne 

 Eocene and is specially abundant in Bastrop, Burleson, Lee and 

 Houston Counties. 



