xii List of Plates. 



Plate IV. 



Figs. A to D. Orthalicus gallina-sultana, C'henin. Dentition. 



E. The same. Jaw. 



F. The same, Genitalia, 



G. Liguus Virgineus, Linn. Genitalia. 



For details, see page 45 of text. 



Plate V. 



Pig. I. Zonites inornatus, Say. Genitalia. 

 II. " friabilis, Binney. 



III. lhl'ix Troostiana, Lea. 



IV. •■ clausa, Say. 



V. " rufo-apicata, Poey. Dentition. 

 VI. " Troostiana, Lea. 

 VII. " Pennsylvanica, Green. Genitalia. 

 VIII. " nux-denticulata, Chemn. 

 I X. •' Josephines, Fer, 



X. Geomalacus maculosus, Allni. " 



Plate VI. 



Fig. I. JJelix Ciarki, Lea. Dentition. 



II. ' Slearnsiana, Gabb. Genitalia. 



III. Orthalicus obductus, Shuttl. Dentition. 



IV. Helix Traski, Lea. Genitalia, in part. 

 Y. •• Ciarki, Lea. Dentition. 



VI. The same. Genitalia. 



VII " Wetherbyi, Bland. Dentition. 



For details, see page 4~> of text. 



Plate VII. 

 Mucjil BrasUiensis, Agassi/.. 



Plate VIII. 



Figs. 1 to 3. MugU Gaimardianus, Desmarest. 

 4 to S. Mugil trichodon, Poey. 



Plate IX. 



Figs. 1, 'J. Gymnoihorax umbrosus, Poey. 

 3,4. Neoconger perlongus, Poey. 



Plate X. 

 Gyinnothorax polygonius, Poey. 



