24 Bulletin ii 24 



This is intermediate in many respects to P. ivhitjieldi Aid., 

 and P. bclli&triata Clark. 



Locality. — Ala.: Woods bluff. 



Type and specimen figured. — Paleont. Mus. Cornell Univ. 



Pleurotoma (Mangilia) infans, PI 3, fig. 3. 



Syn. ? Scobinella Icsviplicata Gabb, Jr. Acad. Nat. vSci. Ihila., voL 4, p. 

 380, pi. 67, fig. 20, i860. 



Pleurotoma infans Mever, Geol. Surv. Ala., Bull. 1, p. 75, pi. 2, 

 fig. 9, 1 886. 



Scobinella infans ^o&sm... Ann. de Geol. etPal., p. 43, 1893. 



PL infans Har., Proc. Ac. Nat. Sci. Phila., 1S95, p. 62, pi. 5, fig. 

 10. 



Glyphostonia harrisi Aid., Bull. Am. Pal., vol. i, p. 61, pi. 2, fig. 

 II, 1895. 



Meyer's original description. — "Small; aperture and canal 

 about one-third of the entire length; the pointed apex is formed 

 by two and a half small, smooth, embryonic whorls; three rather 

 large transversely ribbed, embryonic whorls complete the nucleus; 

 the largest specimen has three adult whorls, — they are strongly 

 carinated in the middle; the upper part has only one revolving 

 line near the suture, the lower part three elevated spirals; the 

 upper part indicates the position of the large, regularly rounded 

 sinus; the lines of the growth are almost rib-like. 



Localities. — Red bluff, Miss., Newton, Mi.ss., Claiborne? Ala., 

 Vicksburg, Miss, (var)." 



Meyer's specimens are evidently' all young or imperfect, 

 for in the well grown examples from Texas there are four adult 

 whorls. Moreover, they show two large tooth-like projecftions 

 on the inside of the labrum and not unfrequently two small plaits 

 on the columella. On the smooth sinus zone there is sometimes 

 a fine spiral line; occasionallj' there are two. 



The Lignitic .specimens show one, rarely two large spiral lines 

 or carinse on the medial and upper whorls. None .so far as 

 noticed show signs of labral or labial dentition. 



