;8 4 



NORTH AMERICAN INDEX FOSSILS. 



Family Muricid^e Tryon. 

 CLXXVII. Urosalpinx Stimpson. 

 Short and thick fusiform shells with spire of few regularly 

 enlarging whorls, and with an anterior canal of moderate length, 

 often slightly bent; aperture pyriform, outer lip often denticulate. 

 Surface with ribs and spirals. Tertiary-Recent. 

 576. U. rustica (Conrad). (Fig. 1146, a, b.) Mioeenic. 



a ^r c ' d §W b 



FlG. 1 146. a, b, Urosalpinx rustica ; c, d, U. cinerea. (Md. Survey.) 



More slender than U. cinereus, shoulder somewhat flatter, pri- 

 mary spirals strong, secondary and later numerous. Inside of 

 outer lip strongly toothed or lirate. 



Chesapeakean of Atlantic coast. 

 577. U. cinerea Say. (Fig. 1146, c, d.) Miocenic-Recent. 



Whorls rounded, rarely with a shoulder flattening, no angula- 

 tion, ribs narrow, round and distant, becoming obsolete above and 



Fig. 1 147. Urosalpinx (Scalaspira) strumosa, two varieties. (Md. Survey.) 



below, often wanting on body whorl ; spirals numerous, not coarse, 

 in several cycles. 



