GASTEROPODA. 131 
Formation and locality. In limestone above the hydraulic beds, of the age of 
the Hamilton group, at the Falls of the Ohio. 
This and the L. laviusculum have been communicated by Dr. James Knapp, of 
Louisville, Ky. 
Loxonema ueviusculum, n. sp. 
PLATE XXVIII, PIGS. 10, 11. 
Shell elongate, subulate. Volutions about twelve in the entire shell, rounded 
and somewhat rapidly expanding to the last one, which is moderately 
ventricose. Suture close and simple. Aperture ovate, the columellar lip 
much extended below. 
Surface nearly smooth or marked by faint obsolescent striae, which are mod¬ 
erately curved over the convexity of the volution, and become fasciculate 
on the lower side of the last one as they approach the columellar lip. 
This species has the general aspect of L. Hamiltonicc, but it is less rapidly 
tapering towards the apex, the volutions somewhat less convex, and the last 
one not so ventricose as in well-preserved specimens of that species. Usually 
the specimens have the appearance of being worn and macerated, and the 
general absence of striee upon the surface may be due in part to this cause; 
but they are associated upon the same surface with L. hydraulicum, which, in 
similar conditions, has retained its surface-striae in good preservation. This 
species is readily distinguished from L. hydraulicum by the less rounded volutions 
and slighter constriction at the suture. It is more rapidly tapering than L. rec- 
tistriatum, with which it is associated, and has no constriction of the upper part 
of the volution as in that species. 
A specimen preserving nine volutions, including the last one, measures about 
one inch and a quarter. 
Formation and locality. In limestone above the hydraulic beds, of the age of 
the Hamilton group, at the Falls of the Ohio. 
