GASTROPODA— STROMBIDJE. 



755 



502. A. (Pterocerella) tippana Conrad. (Fig. 1098.) Cretacic. 

 Spire angulated, with keel and flattened shoulder; lip with six 



finger-like processes somewhat winged by marginal expansions. 

 Ripleyan of New Jersey, Mississippi, Texas. 



503. A. falciformis .Gabb. (Fig. 1099.) Cretacic. 



Fig. 1098. Aporrhais (Pterocerella) tippana. 

 (After Weller.) 



Fig. 1099. Aporrhais falciformis , 

 slightly reduced. (After Gabb.) 



High, slender spire, round whorls, scarcely impressed sutures, 

 narrow rounded and distant ribs gently concave forward, and 

 cancellated by simple spirals. Body whorl nearly smooth; aper- 

 ture with long, falciform expansion. 



Upper Cretacic of California. 



Family Strombid^: d'Orbigny. 

 CXXXVIII. Pugnellus Conrad. 

 Young shell fusiform; adult suboval; inner lip massive, extend- 

 ing as a callus over the whorls ; outer lip variously lobed. Cretacic. 

 504. P. fusiformis Meek. (Fig. 1100.) Cretacic. 



Spire somewhat curved; body whorl somewhat nodose; outer 

 lip with falciform extension and several pronounced lobes. 



Coloradoan (especially Pugnellus sandstone) of Colorado, Utah, 

 Wyoming. 



