CLASSIFICATION OF HELICES. 



XXXI 



B. Siphonadenia. 



Macroogona. 



Teleophallogona. 



Phylogenetic diagram of the groups of Helices. 



Key to genera of Endodontidce. 



[Family synonyms are Charopidce Hutton, Phenacoheliddce Suter, 

 Patulidw Mlldff, Punctidce Gill ; all proposed for groups of less 

 extent than the present family]. 



1. Jaw composed of numerous squarish plates connected by mem- 

 brane only ; side teeth all bicuspid. Shell minute. 



a. Shell depressed, Hyalina- or Patula-like, unicolored, 



with round periphery Punctum, p. 6. 



aa. Shell somewhat trochiform, keeled, at least in young, 



usually flame-painted Laoma, p. 8. 



2.^ Jaw formed of overlapping laminse partially soldered together, 



or solid and vertically striated. 



a. Tail with a mucus gland 

 aa. Mucus gland? 



b. South African forms 

 bb. South American forms 



Flammulina, p. 10. 



Phasis, p. 36. 

 Amphidoxa, p. 39. 



