io8 Bulletin 4 222 



of each whorl, three or four more are finer and occupy a narrow, 

 irregular, central zone, while four or five more occupy the upper 

 or non-costate portion of the whorls. The costae on the several 

 whorls are arranged in lines corresponding in direction to the 

 obliquity of the costae. 



Unfortunately only fragments of this large Cerithium have 

 been found; it doubtless measured eight or ten inches in length 

 when entire. 



''Locality. — Smiley's Bluff, Brazos river, 2 miles above the 

 mouth of Pond creek, Milam Co., Texas. 



''Geological horizon. — Midwaj^ Eocene. 



"Type. — Texas State Museum." 



TURRITELLA. 



Turritella tennesseensis . PI. 11, fig. 5. 



Syn. T. ten?iesseensis Gb., Jr. Ac. Nat. Sci., Phila., vol. iv. , 

 i860, p. 392, pi. 68, fig. 13. 



Gabb's original description. — " Turrited, spire high; whorls? 

 (10?) flattened or concave on the side, carinated strongly below; 

 mouth subquadrate; surface marked by numerous revolving striae, 

 two or three of which are generally larger than the rest, the 

 remainder usually alternating, one or two small ones with one 

 slightly larger. 



" lyCngth (restored)?, 1.2 in.?, width of body whorl one inch 

 from apex, .35 in. 



"Locality. — Hardeman Co., Tenn., marls of Ripley Group. 

 Prof. Safford." 



We have all of Gabb's specimens before us. Two small ones 

 are doubtless the young of T. mortoni; and the others should be 

 placed in the same section, if not under the same specific name. 

 Fig. 5 shows the characters of this so-called species. It will be 

 noticed that the line some distance below the suture is more 

 pronounced than in fig. 6, T. alabamie^tsis , and that the basal 

 carination is somewhat more noticeable. This as well as the 

 following three species? are quite probably but variations of 

 T. mortorii. 



Localities. — Tennesskk: R. R. cut, 2 mi. K. of Middleton, 

 (the specimen figured); 2 mi. S. of Middleton. 

 Georgia: Near base of Midway, Chattahoochee 

 river. 



Type. — Collection of Dr. Safford, Vanderbilt Univ., Tenn. 



