1916.] NATURAL SCIENCES OF PHILADELPHIA. 163 



Genua ORNOPSIS gen. i 



Etymology: opvi?, bird; o<J".$, form. 

 Type: Orno'psis glenni sp. now 



Shell fairly large and strong; body whorl inflated; spire varying in 

 relative altitude; protoconch very small, smooth, paucispiral, and 

 trochoid; both axial and spiral sculpture well developed; aperture 

 pyriform, abruptly constricted, and sinistrally inclined; outer lip 

 marginally crenate; parietal wall washed by a callus; columella 

 marked by a strong laterally compressed laminar plait situated a1 

 the entrance of the anterior canal. 



This genus is characterized by a peculiar narrow flexed canal and 

 a sharp laminar plait on the columella directly behind the entrance 

 of the anterior canal. In these respects it differs from the other 

 Fusidae. In general outline Ornopsis elevata greatly resembles the 

 genus Latirus, but differs from it in the character of the anterior canal. 

 Odontofusus of the Fasciolariidse has a more elevated spire, a more 

 feeble columella fold and a nearly straight anterior canal. The 

 close, compact spire of Ornopsis resembles some of the Buccinidse, 

 but here again the apertural features are distinctly different. 



Ornopsis glenni sp. nov. PI. XXIV, fig. 1. 



Description. — Shell fairly large and strong; elevation of spire less 

 than length of aperture; protoconch very small, smooth, paucispiral 

 and trochoid; volutions of conch six in number, increasing in size 

 from a very small apical whorl to an inflated body whorl; externa! 

 ornamentation well-defined, axials elevated, well rounded and short, 

 beginning at shoulder and quickly evancescing in front of the periphery 

 of body, becoming less prominent toward aperture and disappearing 

 almost entirely in some individuals, costae of varying size and spacing, 

 twelve on body of type; spiral lines sharply impressed, more than 

 thirty on body whorl, becoming fine and oblique on pillar; shoulder 

 broad, feebly convex; suture impressed; body whorl abruptly con- 

 stricted into a slender pillar; aperture pyriform, produced anteriorly 

 into a narrow canal sinistrally inclined; outer lip sharp and mar- 

 ginally crenate ; parietal wall washed with a callus thickest at posterior 

 extremity of aperture; columella flattened at the entrance of the 

 canal into a shelf-like fold. 



Dimensions. — Altitude, 48 mm.: length of aperture and canal, 

 33 mm.; maximum diameter, 24 mm.; spiral angle, 60°. 



This form is well characterized by its pointed apex, much inflated 

 body and further by the flattened shelf-like fold. It is one of the 

 most abundant gastropods at Coon Creek, being represented in the 



