1 90 STROMBID^. 



GALLiNULA (Klein), H. and A. Adams. Inner lip not spread 

 widely over the body-whorl ; outer lip somewhat restricted ; 

 having a long posterior canal, ascending the spire. S. suc- 

 cinctus, Linn, (lix, 59). 



CANARiUM, Schum., 1811. (Strombidea, Swains.) Inner lip 

 restricted, outer lip not dilated, posterior canal short or obsolete. 

 S. Luhuanus, Linn, (lix, 60). 



EUPROTOMUS, Gill. Lip widely expanded, ascending the spire 

 to its apex, the margins subdigitate, sinus of lip anterior. Most 

 nearly related to Pterocera, among the Strombs. S. laciniatus, 

 Chemn. (lix, 61). 



ONCOMA, Mayer, 1816. Spire short; whorls convex, keeled or 

 tuberculate ; the last very large, keeled behind ; mouth long, 

 with short anterior canal ; outer lip wing-like, entire. 8 sp. 

 Eocene and Oligocene. S. Fortisi, Brongt. 



Pterodonta, d'Orbigny. 



Bistr. — Fossil, 8 sp. Chalk ; France. P. inflata, d'Orbigny 

 (Ixxxviii, 56). 



Shell oblong, ventricose, spire elongated ; aperture oval, lip 

 slightly expanded, notched in front, and with a tooth-like ridge 

 internally, remote from the margin. 



PuGNELLUS, Conr. 

 Distr. — Fossil. Cretaceous only. P. hamulus^ Gabb (Ix, 



n,i2). 



Shell fusiform in the young state ; in the adult aperture narrow, 

 outer lip developed into a massive lobe, notched above and below ; 

 canal produced and incurved ; the whole shell enveloped in a 

 more or less heavy incrustation, a prolongation of the deposit 

 on the inner lip. 



GYMNARUS, Gabb. Outer lip less heavy and produced posteri- 

 orly in a hook ; anterior canal slightly produced and straight ; 

 incrustation not covering the entire shell, the back being exposed. 

 A single species from the Chico group (Cret.) of California. P. 

 manubriatus, Gabb (Ix, 13). 



Pterocera, Lam. 



Etyra. — Pteron, a wing, and ceraa^ a horn. 



gyn. — Harpago, Millipes and Heptadactylus, Klein. 



Distr. — 10 recent sp. Indian Ocean and eastern Pacific. 

 Fossil. Jurassic, Cret. — . P. lambis, Linn, (lix, 62). 



Outer edge of mantle digitate. Operculum as in Strombus. 

 Shell ovate, spire more or less elevated ; aperture elongate, outer 

 lip digitate, with a long, straight or curved anterior canal, and a 

 shorter or long posterior canal, ascending and surpassing the 

 spire. 



