514 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.51. 



mostly spiral, consisting, first, of the above-mentioned rather promi- 

 nent cord separated by a somewhat excavated interspace from (on 

 the earlier whorls three) flattened spirals w4th equal wider inter- 

 spaces, in two of which on the last whorl faint indications of a very 

 small intercalary thread are visible; the last whorl rounds evenly to 

 the convex base, on which five spiral bands occur, but with nan-ower 

 groovelike interspaces; these basal bands are distinctly undulated 

 or subnodulous. The canal was apparently short and strongly 

 twisted, the aperture not represented on the mold. Height of 10 

 whorls (the nucleus not preserved), 41; maximum diameter of last 

 whorl (the outer lip wanting), 17 mm. 



Locality. — Station 3381, a fossil coral reef at the base of the bluff 

 at Little Horseshoe bend, just below the mouth of the Blue (or Russell) 

 Spring branch, 4 miles below Bainbridge, on the Flint Eiver, Decatur 

 County, Georgia; T. W. Vaughan, 1900. U. S. Nat. Mus. Cat. No. 

 166735. 



CERITHIUM CORALLICOLUM, new species. 



Plate 87, fig. 6. 



Shell large, heavy, the decollate specimen with seven whorls, the 

 four or five earlier whorls with an appressed suture; the subsequent 

 turns in the type-specimen have a strongly marked shoulder just in 

 front of the suture, giving the effect of a channel; the whorls moder- 

 ately rounded, the earlier ones crossed by (about 14) slightly retrac- 

 tiveiy curved narrow rounded ribs extending from suture to suture, 

 with somewhat wider interspaces; on the later whorls the ribs gradu- 

 ally become more sparse and prominent with wider mterspaces, and 

 are sigmoidly flexuous, subnodulous at the shoulder, and rather 

 abruptly ceasing a short distance behuad the succeeding suture; on 

 the last whorl there is a slight constriction in front of the presutural 

 nodules; spiral sculpture of fine at first subequal threads with nar- 

 rower interspaces; later there is some irregularity in the width of the 

 spirals which become flattish; on the last whorl between the shoulder 

 and the periphery of the base there are about 15 of these spirals; the 

 indications of the defective specimen are that the threads become 

 more prominent at least near the periphery of the rounded base; the 

 aperture is gone, but its posterior commissure is thickened and ex- 

 tended backward toward the periphery of the preceding whorl. 

 Length of specimen as figured, 47; diameter of last whorl, about 20; 

 of apex at fracture, 5 mm. 



Locality.— Station 7074, on the west bank of Flint River at Hale 

 landing, 7 miles southeast of Bainbridge, Decatur County, Georgia, 

 in coralliferous chert; Vaughan, Cooke, and Mansfield, 1914. U. S. 

 Nat. Mus. Cat. No. 166736. 



Though the type-specimen is so imperfect, the sculpture is quite 

 sufficient to distinguish it from any of the other species described in 

 this paper. 



