SYNOPSIS 



OF THE 



NORTH AMERICAN FAMILIES AND GENERA OF MOLLUSCA DESCRIBED IN THIS WORK. 



I. CEPHALOPODA. 



Sepiad^:, Loligo. 



SiPHONiDiE, Spirula. 



II. PTEROPODA. 

 ClioniDjE, Clio. 



III. GASTEROPODA. 



a. NUDIBRANCHIA. 



Dorid^e, Doris. 



Tritonid.5:, Tritonia. 



Glaucid.e, Eolidia, Cavolina, Filurus. 



b. INFRABRANCHIA. 

 HemiphyllidjE, Ancylus. 



c. TECTIBRANCHIA. 

 AcERiDiE, Bulla. 



d. PULMOBRANCHIA. 



Limacid.e, Limax, Arion, Tebennophorus. 



Helicii>jE, Vitrina, Helix, Pupa, Succinea, Bulimus. 



Auriculid^e, Auricula. 



Limniad^e, Planorbis, Limnea, Physa. 



e. OPERCULATED PULMOBRANCHIA. 



Cyclostomid«, Cyclostoma. 



Helicinid^:, Helicina. 



/. PECTINIBRANCHIA. 



£ Paludina, Amnicola, Mclania, Anculotus, Io, Littorina, Margarita, 



TuRBiNiDiE, < Cingula, Lacuna, Turritella, Pyramis, Odostomia, Vermetus, 



(_ Skenea, Valvata, Natica. 



Trochid^e, Ampullaria, Janthina, Scalaria, Tornatella, Pirena. 



