512 PROCEEDINOS OF THE NATIONAL MUSEUM. vol.51. 



CERITfflUM MASCOTIANUM, new species. 



Plate 87, fig. 12. 



Shell large, robust, conical, the specimen a cast from an impression 

 in a chert block, showing part of five flattish whorls; axial sculp tm-e 

 of about 30 nari'ow slightly flexuous ribs with narrower interspaces 

 becoming less promuient on the later whorls; also irregularly dis- 

 tributed thickened varices, of which tlu-ee are seen on the cast of 

 three half whorls; suture distinct not channeled; in front of it the 

 next whorl carries a thickened band separated from the rest of the 

 whorl by a marked constriction and undulated by the posterior ends 

 of the axial ribs; this band is also more or less spirally striated. Be- 

 tween the constriction and the periphery of the base are six or seven 

 strap-like flattened bands, overriding the ribs without becoming 

 nodulous, the interspaces very narrow. There is also more or less 

 fine spiral striation, which is indistinct on the cast. Length of three 

 whorls, 32; diameter of the posterior of the three, 16; of the anterior 

 one, 22 mm. 



Locality. — Station 7079, on the east bank of Flint River, below 

 the mouth of Russell or Blue Spring branch at Mascot Point; 

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

 166732. 



Fragmentary casts give a length of 70, a maximum width of 22 

 mm., and show more than 10 whorls. The base appears to have 

 been convex and smooth with a very short stout twisted pillar. 



CERITHIUM HALENSE, new species. 



Plate 87, figs. 9, 10. 



Shell large, conic, the apex defective, the remainder comprising 

 10^ flat whorls rapidly widening; suture inconspicuous, not inter- 

 rupting the lateral planes of the spire; sculpture on the ninth whorl 

 comprising a spiral band just in front of the suture, ornamented with 

 low rounded nodules separated from one another by distinct spaces, 

 about four nodules to 10 millimeters length along the band; in front 

 of this are two narrower more closely nodulous spirals with narrower 

 sphal interspaces rather distinctly channeled; in front of the anterior 

 one of these is a somewhat larger similarly nodulous band about half 

 as wide as the first one; in the interspaces or just behind the suture 

 there is occasionally a narrow not nodulate thread; no axial sculp- 

 ture is perceptible; on the last whorl there is a small thread at the 

 rounded periphery of the base, which in the preceding whorls is usually 

 covered by the suture; the base is flat and smooth except for incre- 

 mental fines which indicate that the basal part of the outer lip is pro- 

 duced and rounded; the siphon appears to have been very short and 



