SYNOPSIS 
OF THE 
NORTH AMERICAN FAMILIES AND GENERA OF MOLLUSCA DESCRIBED IN THIS WORK. 
I. CEPHALOPODA. 
SERTAD I sees see ne ae Loligo. 
SIPHONIDAN Joe oo ens Spirula. 
Il, PTEROPODA. 
Ciionipa jee sc eee eee Clio. 
II. GASTEROPODA. 
a, NUDIBRANCHIA. 
IDORUD Ie sn Se ae oe Doris. 
(ERETONID Fupeea= sos asso Tritonia. 
Gir auom as ooo Eolidia, Cavolina, Filurus. 
b. INFRABRANCHIA. 
HeEMIPHYLLIDA, --------- Ancylus. 
c. TECTIBRANCHIA. 
ACERID ER; Y=) =452u2254= Bulla. 
d, PULMOBRANCHIA. 
Tn AGID aay rane een Limax, Arion, Tebennophorus. 
Pigr rota, = foo saa Vitrina, Helix, Pupa, Succinea, Bulimus. 
AURICULIDE, 22-22 a2-— = Auricula. 
GTM NTAD Rte ee Planorbis, Limnea, Physa. 
e. OPERCULATED PULMOBRANCHIA, 
CycLosTomMID#, ---------- Cyclostoma. 
HELICINIDE, -2aos2 sees == Helicina. 
f. PECTINIBRANCHIA, ‘ 
cia Amnicola, Melania, Anculotus, Io, Littorina, Margarita, 
Cingula, Lacuna, Turritella, Pyramis, Odostomia, Vermetus, 
Skenea, Valvata, Natica. 
EROCHID2 acsesneasess—> Ampullaria, Janthina, Scalaria, Tornatella, Pirena. 
TURBINID A, oes ooee a= 
