1895.] NATURAL SCIENCES OF PHILADELPHIA. 81 



Creek, Pleasauton, Atascosa Co., Tex. Also 5 miles southeast of 

 Gibbsland, and 2 miles southeast of Mt. Lebanon, Bienville Parish, 

 La.; 4 miles west of Enterprise, Miss. ; base of bluff at Claiborne, Ala. 



Specimens from the last-mentioned locality are somewhat less broad 

 at base, more strongly striated spirally, and with slightly more 

 rounded volutions than the typical Texan form. In the collection 

 of the Academy of Natural Sciences of Philadelphia these Lower 

 Claiborne forms are labelled by Conrad "Mesalia claibornemis." 

 I am not aware that the species has ever before been figured or de- 

 scribed. It is one of the most abundant and characteristic of the 

 Texan Eocene. 



Geological horizon. — Lower Claiborne Eocene. 



Type.— Texas State Museum. 



Genus TTJRRITELLA. 

 Turritella nasuta Gabb, var. houstonia nov. var. PI. 9, fig. 6. 



This variety differs from typical nasuta in being much broader at 

 base, and having its whorls rounded or slightly carinated submedi- 

 ally. It is generally somewhat larger than the typical form, and is 

 closely related to Conrad's Mesalia lintea. 



Localities. — Rio Grande, at Webb-Zapata County line ; Elm Creek, 

 near Beuchley; Alum Bluff Trinity River, Houston Co.; Dunn 

 Ranch, Robertson Co. Also in South Carolina, near Orangeburg 

 C. H. 



Geological horizon. — Lower Claiborne Eocene. 



Type. — Texas State Museum. 



Turritella dumblei nov. sp. PI. 9, fig. 7. 



8]>ecific characterization. — Size and general form as shown by the 

 figure; whorls about 15; the lower two to four show an obtuse basal 

 carination while above, this feature is not so apparent ; surface 

 marked by raised spiral lines alternating in size, the carinal zones of 

 the lower whorls are marked by two somewhat stronger lines ; lines 

 of growth plainly cutting the spiral lines and causing them to appear 

 under a glass like diminutive strings of beads. 



This species reminds one somewhat of T. alabamiensis Whitf., but 

 is most probably nearest allied to T. infra granv 'lata Gabb (Geol. 

 Surv. Cal., Pal., vol. 1, 1864, p. 212, pi. 32, fig. 279), from near 

 Martinez, Cal. Wherever the lines of growth are strong over the 

 basal carina they tend to produce an "infra-granulata" appearance. 



