700 CRETACEOUS PALEONTOLOGY. 



Description. Shell with an apical angle of about 27 ; the 

 figured specimen 36 mm. in length, with a maximum diameter of 

 13.5 mm., and showing seven volutions. The specimen is incom- 

 plete at both ends, and when complete it must have been 60 mm. 

 or more in length, with 14 or more volutions. Suture situated 

 near the middle of a rather broad, depressed, concave channel 

 of moderate depth, the lower slope of the channel being less 

 abrupt than the upper and with a slight revolving rib midway 

 of the slope ; the greatest depth of the sutural furrow lies a little 

 above the suture itself. Surface of the volutions, between the 

 margins of the sutural furrow, flat and marked by three strong, 

 revolving, angular ribs of equal strength, with rounded inter- 

 spaces. 



Remarks. This shell has much the aspect of T. gatunensis 

 Con., as illustrated by Dall 1 , from the Eocene, but the three re- 

 volving ribs are more nearly equal in height, consequently 

 making the surface of the volutions between the sutural channel 

 appear much flatter. 



Formation and locality. Wenonah sand, near Crawfords Cor- 

 ner (i26 3 ), near Marlboro (130). 



Geographic distribution. New Jersey, Alabama, Mississippi, 

 Texas, Arkansas. 



Turritella tippana Conrad. 

 Plate LXXIX., Figs. 6-7. 



1858. Turritella tippana Con., Jour. Acad. Nat. Sci. Phil., 2nd 



ser., vol. 3, p. 333, pi. 35, fig. 19. 

 1 86 1. Turritella Tippana Gabb, Synop. Moll. Cret. Form., p. 



147 (91). 

 1864. Turritella tippana Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 19. 



Description. The dimensions of a large example, incomplete 

 at the apex, are : height, 69 mm. ; greatest diameter, 22 mm. ; 

 apical angle about 19 ; number of volutions shown, 10. Suture 



1 Trans. Wagner Free Inst. Sci., vol. 3, p. 310, pi. 17, fig. 10. 



