98 THE NAUTILUS. 



ery, more strongly striated and with a deeper retral sinus. Maj. 

 Thos. L. Casey, U. S. Engineers, has sent me examples from the 

 upper part of the bluff at Vicksburg. The shell is named in his honor. 



Cancellaria annosa Aldr. PI. Ill, fig. 3. 



This species was described in The Nautilus, Vol. XI, p. 97, 

 January, 1898. 



Ctpr^a nuculoibes n. sp. PI. Ill, figs. 4, 5 and 6. 



Shell broadly ovate, rounded, globose, extremities slightly pro- 

 duced, surface smooth, basal callus heavy and extending upwards 

 about one-third on each side, base flattened, rounded into the aper- 

 ture, resembling in this respect G. pinguis Con., but broader. Aper- 

 ture rather narrow, denticulated. 



Length 17 mm., greatest breadth 14 mm. 



Localities : From the Claibornian at De Soto, Miss., McLeod's 

 Mill, Miss., and Dubose's Mill, in "West Alabama. 



This species has a more flattened base than C spheroides Con. and 

 has a much heavier basal callus. The inner lip is smooth below the 

 denticulations. 



Clavilithes columbaris n. sp. PI. Ill, fig. 7. 



Shell fusiform, whorls ten, apex bulbiform, consisting of three 

 whorls, the third constricted; the next four spirally striated and 

 tuberculated, the last two strongly turreted and excavated below the 

 sutural shoulder. Aperture small, constricted at posterior. Canal 

 long, narrow. 



Length of figured specimen 52 mm. 



Localities : Claibornian of De Soto and McLeod's Mill, Miss., also 

 in West Alabama, same horizon. This species approaches the form 

 described by Harris as Clavilithes humerosus Con., var. texanus, but 

 the size and extremely prominent shouldered whorls and the constric- 

 tion below are peculiar. The figured example is the most perfect 

 one obtained, but the shoulder is even more prominent in other speci- 

 mens. On comparing this species with C. longcBviis Lamarck, I find 

 it has one less embryonic whorl and a higher spire. 



FiSSURIDEA INFREQUENS, n. Sp. PI. Ill, figS. 8, 9. 



Shell medium size, with broadly ovate periphery at base, rather 

 depressed ; substance of shell thin, foramen in anterior half, small and 

 narrowly ovate. 



