80 PROCEEDINGS OF THE ACADEMY OF [1895. 



The costse on the several whorls are arranged in lines correspond- 

 ing in direction to the obliquity of the costse. 



Unfortunately only fragments of this large Cerithium have been 

 found; it doubtless measured eight or ten inches in length when en- 

 tire. 



Locality. Smiley 's Bluff, Brazos River, 2 miles above the mouth 

 of Pond Creek, Milam Co., Tex. 



Geological horizon. Midway Eocene. 



Type. Texas State Museum. 



Genus MESALIA. 

 Mesalia claibornensis Con. (MS). PL 9, fig. 5. 



Specific characterizations. Size and general form as indicated by 

 the figure; whorls about 15; sides of the whorls nearly rectilinear; 

 sides of the spire taken as a whole slightly concave ; surface of each 

 whorl ornamented by spiral lines of three sizes, of which there are 

 from five to seven of the first and second, and double that number 

 of the third magnitude, the latter are mere strise ; lines of growth 

 faint or obscure; suture well defined but very narrow. 



This species is similar in some respects to Conrad's Mesalia vetusta, 

 but can at once be distinguished by the following differences: clai- 

 bornensis has two or three more whorls; the sides of the spires are 

 concave and not convex as in that of vetusta ; the suture is less dis- 

 tinctly marked by a shoulder below it; there is a total lack of those 

 strong lines or folds of growth so characteristic of vetusta ; the lower 

 angulation of the body whorl is more sharply defined. 



Localities. Colorado River, Devil's Eye, Bastrop Co.; Mosley's 

 Ferry, Brazos River; Wheelock, Robertson Co.; Little Brazos 

 River; Cedar Creek, Wheelock League, Walker's and Mont- 

 gomery's farm, Robertson Co.; College Sta., Brazos Co. (from a well 

 1,200 feet deep); Elm Creek, near Benchley's; Wm. Reid Head- 

 right, Brazos Co. ; Elm Creek, Lee Co.; Berry man's Place, Cherokee 

 Co. ; Alabama Bluff, Trinity River, Houston Co. ; 5 miles west of 

 Crockett, and Hurricane Bayou, Houston Co.; northwest corner of 

 Madison Co. ; 3 miles northeast of Crockett, on Rusk road ; along Elm 

 Creek, from Orrell's to Price's crossing; Lewis' house, 2 miles east of 

 Alto, Cherokee Co. ; Dr. Collard's farm, Town Branch, Sparks Head- 

 right, Brazos Co.; Dunn's Ranch, Gafford Headright, Robertson 

 Co.; Walker's pasture, Wheelock Prairie, Robertson Co.; Bonita 



