202 TRANS. OF THE ACAD. OF SCIENCE. 
MacrocueILus PonDEROSUs, Swallow. 
Shell thick, elliptical, is ae short, tapering copies 
volutions five eg ven, convex, imbricate; gern alightly ane 
« Spira nite = Stra angle, 65° to 70°; length of sel 
1.25; length of spi re, 0.45; leneth of body whorl, 0.90 ; len 
of aperture, 0.80; breadth of body whorl, 0.85; length | 
tween the last and penultimate sutures on the side opposite 
to the aperture, 0.19. 
shell resembles the a ee imbricatum of Sower- 
by (Min. Con., Vol. IL., pl. 566, fig. 2); Macrocheilus imbri- 
catus of Phillips (Pal. Fos, a 3 fig. 194); but our sl shell i is 
not so much elongated; ee 
and spin e markings are more obscure. It also differs from oe 7 
Joy, (Pal. Fos.) in having no coneave 5 Home 
ae “Mai. Sines Salletson from the Upper Coal Measures ine 
the valle y of the Verdigrs, K. 7 Aa 
es Turzo oBESUS, Shumard. — : 
Shell rotundateovate;. spiral angle, 96°; spire de 
rapidl ly ¢ enlarging, evenly rounded, the last 
elongate-ovate ; Fink marked with equ — 
: distant revolving substoda i e Tot unded striz, bs y re 
are from se teen to twe nd which | 
