504 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.. 51. 



MARGINELLA SIUCIFLUVIA, new species. 



Plate 88, fig. 1. 



Shell small, smooth, slender, with about five moderately convex 

 whorls, the suture obscured by a thin wash of enamel; apex blunt; 

 las^t whorl much the largest, the suture behind it slightly constricted; 

 outer lip shghtly thickened, the aperture obscured by the presence of 

 matrix. Actual length of specimen, 8.5 mm.; the total length prob- 

 ably about 8.8; diameter, 4 mm. 



Locality. — Station 7074, on the west bank of FHnt Eiver, 7 miles 

 southeast of Bainbridge, at Hale landing, in ooralliferous chert; 

 Vaughan, Cooke, and Mansfield, 1914. U. S. Nat. Mus. Cat. No. 

 166722. 



This species belongs to the group of Marginella avena Lamarck, a 

 representative of which has hitherto been missing from this horizon. 



MARGINELLA HALENSIS, new species. 



Plate 88, fig. 2. 



Shell small, smooth, a thin layer of callus covering the rather blunt 

 spire, which appears to consist of three or fom* whorls; the aperture 

 concealed by matrix; the outer lip noticeably thickened, the reflected 

 callus carried aromid the outside of the canal; the body inflated, 

 rapidly attenuated anteriorly, the periphery at the shoulder. Length, 

 2.75; diameter 1.78 mm. 



Locality. — Station 7074, on the west bank of Flint River, 7 miles 

 southeast of Bainbridge, Decatur County, Georgia, at Hale landing, 

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

 Nat. Mus. Cat. No. 166723. 



LYRLA MANSFIELDI, new species. 



Plate 86, fig. 3. 



Shell fusifonn, solid, with about seven whorls, excluding the (lost) 

 nucleus; suture distinct but not impressed; whorls rapidly enlarging, 

 moderately convex, with an acute apex ; axial sculpture of about (on 

 the penultimate whorl) nme low and ill-defined ribs, none distinct on 

 the earlier whorls and on the last whorl becoming obsolete anteriorly; 

 the lines of growth are also rather marked; spiral sculpture near the 

 canal of four or five flattish thi-eads with wider interspaces; the canal 

 is bent to the right and has a distinct siphonalfasciole; outer lip defec- 

 tive; imier lip with eight or more columellar plaits more prominent 

 anteriorly, with a rather heavy callus on the body near the junction 

 of the outer lip. Length of shell, 47; of last whorl, 41; maximum 

 diameter, 22 mm. 



Locality. — Station 7096, at Red Bluff, on the west bank of Flint 

 River, 7 miles above Bainbridge, Decatur County, Georgia; Vaughan, 

 Cooke, and Mansfield, 1914. U. S. Nat. Mus. Cat. No. 166724. 



