1809.] NATURAL SCIENCES OF PHILADELPHIA, 73 



below, the one at the suture very small and becoming obsolete on 

 the upper whorls, the second one below the suture about one-half 

 the size of the others, between the ridges the lens shows very fine 

 revolving and longitudinal lines. Length of specimen 25 mm., 

 diam. 9 mm. 



One specimen collected by the writer from the Lower Claiborne 

 at Moseley's Ferry, Brazos river, Burleson Co., Texas. 



Latirus obtusus n- sp. Plate I, fig. 7. 



Shell fusiform, with 6i whorls including the nucleus, embryonic 

 whorl large, smooth and obtuse, the following whorl commences with 

 numerous longitudinal ribs, but soon assumes the general sculpture 

 of the shell, which consists of six large rounded ribs on each 

 Avhorl, which are crossed on the spiral whorls by eight revolving 

 ridges, on the body whorl the revolving ridges exceed 30 in num- 

 ber, on the anterior portion they alternate and become very small, 

 under the lens there is also visible, especially between the larger 

 ribs, small longitudinal raised lines, representing probably lines of 

 growth; columella shows but one small fold. Length 16 mm., 

 greatest diam. 4 mm. 



Two specimens collected by the writer, from the Lower (/lai- 

 borne, at Hurricane Bayou, Houston Co., Texas. 



Latirus suturalis n. sp. Plate I, fig. 6. 



Shell fusiform, whorls feven, the three apical whorls smooth, 

 the lower one with a few smooth longitudinal ribs, followed by the 

 general sculpturing of the shell which consists of eight longitudi- 

 nal ribs, which are crossed by prominent revolving ridges, three on 

 the spiral whorls and eight on the body whorl, small revolving 

 raised lines alternate with the ridges, junction of the revolving 

 ridges and longitudinal ribs subnodose, longitudinal ribs inter- 

 rupted above the suture, forming a deep sutural area, interior of 

 the outer lip with five teeth-like ridges, columella with three prom- 

 inent plaits. Length 8 mm., greatest diam. 4 mm. 



Three specimens from the material collected by Thomas A. 

 Morgan at Jackson, Miss. 



Latirus harrisii u- sp. Plate I, fig. 8. 



Latirics sitigleyi vsLT. Harr.s. Proc. Acad. Nat. Sci., 1895, p. 71, pi. 6, 

 fig. 13a. 



A study of an almost perfect specimen of this species from 



