188 Transactions. —Z oology. 
three is unknown. Amphidoxa rapida, said to come from New Zealand, 
occurs in North Australia (with a variety at the Solomon Islands) ; while 
Rhagada rienga, and Streptawis taranaki, both doubtfully New Zealand, are 
closely allied to species from the same place. Our closest connection thus 
appears to be N. Australia, but there is a considerable generic affinity with 
the faunas of New Caledonia, Polynesia, and S. America. 
Synopsis of the Families. 
Sec. GONIOGNATHA. 
Jaw of several transverse plates. 
Sec. HOLOGNATHA. 
Jaw of a single piece. | 
Sub-sec. AuLocoenaTHa. 
Marginal teeth quadrate, 
Fam. Helicida. 
Animal heliciform (except Otoconcha), the tail without a mucous gland. 
Fam. Charopida. 
Animal heliciform, the tail with a mucous gland. 
Sub-sec. OXYGNATHA, 
Marginal teeth aculeate. 
Fam. Vitrinide. 
Animal heliciform, no caudal mucous gland. 
Fam. Limacide. 
Animal limaciform, no caudal mucous gland. 
Fam. Zonitide. 
Animal heliciform, a caudal mucous gland. 
Sec. ELASMOGNATHA. 
Jaw with a posterior accessory plate. 
Sec. AGNATHA. 
No jaw; teeth sli aculeate. 
Fam. Streptaxida. 
Animal heliciform, no mucous gland. 
Fam. Testacellida. 
Animal limaciform, no mucous gland. 
As Pulmonate Mollusea are now always classified principally by the 
structure of the animal and its dentition, it is not easy to make an analytical 
key leaving out these important points; but the following remarks may 
assist collectors in naming their shells. 
1. Species with a few rapidly increasing whorls belong to Otoconcha, 
Amphidoxa, Vitrina, Paryphanta, Elea, Rhytida, or Daudebardia. 
2. Species with plaits inside the aperture belong to Tornatellina, Stro- 
bila, Endodonta, Paxillus, or Diplommatina, 
