FLEUROCERA. Gl 



Chiefly distinguished by the narrow lengthened canal which 

 terminates the aperture. Mr. Lea's figure being imperfect I 

 have figured a specimen in Mr. Anthony's collection. 



7. P. robustum, Lea. 



lo rohusta, LKA. Proc. Acad. Xat. Sci., p. 393, 18(11. Jour. Acad. Nat. Sci., v, pt. 3, 

 p. ;540, t. 39. f. 213, March, 1863. Obs., ix, p. 1G8. 



Description. — Shell canaliculate, slightly tuberculate, raised, coni- 

 cal, pale horn-color, obscurely banded below ; spire regulai'Iy conical ; 



sutures very much impressed ; whorls about ten, flat- „. 



•^ ' ' Fig. 115. 



tened about the apex, channelled below; aperture 

 rather small, rhomboidal, banded within -f outer lip 

 shai^p and sigmoid; columella pale salmon color; 

 channel rather short. 



Operculum ovately angular, spiral, very dark brown, 

 with the polar point near to the basal margin. 



Habitat. — Tennessee liiver, Alabama? Wm. Spill- 

 raaii, M. D. 



Diameter, -76; length, 1-49 inches. 



Observations. — There are two specimens before 

 me. Both have tubercles below the sulcate channel, but one has 

 them much better developed than the other. The aperture within is 

 pale salmon in both specimens, but this may not be constant. It is 

 rather shorter in the channel than nodosa, herein described, and the 

 spire is also shortei'. The aperture is more than one-third the length 

 of the shell. — Lea. 



This species is exceedingly closely allied to unchdntum but 

 appears to be rather wider, more obtusely conical and more 

 robust. The ai>erture is produced into a somewhat longer 

 canal at the base than that species usually exhibits. 



The figure is a copy of that of Mr. Lea. 



