112 Bulletin 4 2a6 



MESALIA. 

 Mesalia ptimila^ PI. 11, fig. 15. 



Syn. Tmn'itella piiniila Gabb, Jr. Ac. Nat. Sci., Phila., vol. 

 iv, i860, p. 392, pi. 68, fig. 14. 



Gabb' s original description. — " Turrited, whorls? (spire is 

 broken) rounded and strongly striate; mouth round; shell very 

 thick; surface marked by three heavy revolving lines on the con- 

 vexity of the whorl, and one at the base just above the suture, 

 which is small but distinct. 



'"Dimensions. — lycngth of fragment .5 in., width of body whorl 

 .3 in., diameter of mouth .1 in. 



''Locality. — With the above. Prof. Safford." 



There is little doubt in the writer's mind that if enough mate- 

 rial were at hand this would grade into '' Potamides'' alabami- 

 ensis Whitf. 



By examining Gabb's -types of this species it will be seen that 

 the one he had most in mind and the one he figured is from a 

 clay bank two miles south of Middleton, associated accordingl)^ 

 with his Turritella hardemanerisis . The other specimens, see fig. 

 18, are from the limestone on Muddy creek, east of Middleton. 



The specimens from the limestone beds classified by Gabb as 

 puinila l3Ut certainly more nearly hardema7iensis are from: — 



Tennessee: Muddy creek, E. of Middleton; >^ mi. 

 S. of Middleton; 2 mi. E. of Middleton. 



Type. — Collection of Dr. Safford. 



Mesalia pnmila var. zvilcoxiana, PI. 11, figs. 16, 17. 



Syn. Turritella wilcoxiana Aid., Geol. Surv. Ala., 1894, p. 

 247, pi. 13, fig. 4b. 



This was described by Aldrich as a species of Tcrritella from 

 the Midway of Alabaina. Since it comes from the same stage as 

 M. pumila and bears to it so close a resemblance we have little 

 hesitation in calling all one and the same species with but 

 varietal differences. 



Localities. — Texas: i mi. up Salt branch of lyittle Brazos river; 



Tehuacana. 

 Alabama: i mi. S., ij^ mi. S. W., and i mi. W. 



of Palmer's mill; i mi. N. of Midwaj^ 

 Type. — Aldrich 's collection. 



Mesalia pumila var. hardevtanensis, PI. 11, fig. 19. 



Syn. Tirritella hardemaneyisis Gabb, Jr. Ac. Nat. Sci., Phila., 

 i860, p. 392, pi. 68, fig. 15. 



