STREPOMATID. 257 
Adams. Strepoma, Raf.) Shell generally lengthened conical, 
with elevated spire; aperture moderate, produced into a short 
spout or canal in front; columella not callously thickened. 
Distr.—84 sp. Ohio, Tennessee and Alabama Rivers and their 
tributaries. P. canaliculata, Say (1xxi, 8). 
Gontopasis, Lea. 
Syn.—Melasma, Juga, Megara (sp.), Elimia, H. and A. Adams. 
Distr.—274 sp. United States, east of the Mississippi River, 
California and Oregon. G.impressa, Lea (1xxi, 9). G. Boykin- 
tana, Lea (1xxi, 10). G. Virginica, Say (lxxi,11). The genus 
does not occur recent in the elevated region west of the 
Mississippi. Fossil, Laramie beds—; Western U. 8. 
Shell heavy, ovate or elongated ; aperture somewhat angulated 
in front, but neither notched or canaliculate. 
EURYCEZLON, Lea. Shell obovate, heavy, nodosely angled ; 
aperture large, ear-shaped ; columella oval, subtruncate. 10 sp. 
E. Tennessee, N. Alabama. G. Anthonyi, Budd (xxi, 12). 
PYRGULIFERA, Meek. 
Distr.—Cretaceous; Wyoming T., U. 8. P. humerosa, Meek 
(beat, 137- 
Spire produced; whorls shouldered and nodular; aperture 
subovate, faintly sinuous, a little produced, but not notched or 
distinctly angular below; columellar lip a little callous below, 
thickened throughout. Very closely allied to the Melanian 
genus Tiara, Bolten. Dr. C. A. White considers Paramelania, 
E. A. Smith ,.(= Tiara), synonymous; it includes three species 
living in the African lake Tanganyika. 
CASSIOPELLA, White, 1878. 
Distr.—C. turricula, White. Fossil, Laramie beds; Western 
U.S. 
Shell turriculate, the whorls angulated in the middle. Differs 
from Goniobasis in being umbilicated. 
ScuizostomMa, Lea. 
Syn.—Schizocheilus, Lea. (Gyrotoma, Shuttleworth. Mela- 
toma, Anthony. Apella, Mighels. 
Distr.—26 sp. Coosa River, Alabama. 8S. babylonicum, Lea 
(Ixxi, 14-16). 
Shell conical or fusiform; aperture large, ovate, obtusely 
angled below; outer lip with a posterior, sutural sinus or fissure ; 
columella smooth, incurved. 
ANCcULOSA, Say. 
Syn.—Anculotus, Say. Ancylotus, Herm. Leptoxis (Raf?), 
Hald.; © 
