NOTES ON THE STENOGYRINJE. Vll 



SUBFAMILY STENOGYRI1SLE. 



This very extensive subfamily, comprising 29 genera and 

 about 500 species, has not before been made the subject of 

 monographic research, and although a few of the genera have 

 been carefully studied, there has yet been no adequate classi- 

 fication of the group. 



Anatomical data are still lacking on many of the genera, 

 and very few have been sufficiently investigated. A division 

 of the subfamily into five series of genera or phyla is indi- 

 cated by data presented in this and the preceding volumes. 

 Three of these phyla are represented in Africa, Asia and 

 America. The phyla are as follows : 



I. Subulina phylum. IV. Rumina phylum. 



II. Leptinaria phylum. V. Obeliscus phylum. 



III. Opeas phylum. 



Of these, phyla I, II and III are closely related, and to- 

 gether form a group systematically equivalent to either of 

 the others. 



I. Subulina phylum. 



The shell varies from ovate to turrite, the latter being the 

 prevalent contour. The columella is truncate basally, acha- 

 tinoid, and the summit is bulbous and hemispherical with 

 few exceptions. 



The genera are as follows: 



America. Africa. 



Subulina. Subulina. 



Luntia. Ceras - 



Tornaxis. Homorus. 



Pseudoglessula. 



8. E. Asia. Chilonopsis. (St. Helena). 



Bacillum. Bocageia ( -f- Petriola) . 



The positions of Luntia and Tornaxis are still uncertain. 

 Their soft anatomy is unknown, and I have not seen the shells. 

 They may possibly be Oleacinoid. Bacillum seems most akin 



