68 TORNATELLINIOE. 



Amastridcc than either is to Torna-tellinidcc. We conclude 

 that the three families, while interrelated, are all very old, 

 and probably descended from an ancient extinct family, more 

 generalized than either, and related to the Pupillidte (includ- 

 ing Enidcc) and Ferussacidce, differing however by the 

 structure of the prostate gland. 



Habits and Stations of Tornatellinidce. 



The following notes, brought together by the junior author, 

 relate to Hawaiian forms, but no doubt most of the data ap- 

 ply equally well to those of other islands. The higher moun- 

 tain slopes of the Hawaiian Islands offer an almost unlimited 

 field of study to the painstaking collector of small or minute 

 species of land Mollusca. This region, especially on Oahu, 

 Molokai and Lanai, has been pretty well covered for the 

 larger arboreal species (Achatinellidcs) , but in what is known 

 to the average collector as " small trash ' (such as Torna- 

 tellina), it is practically an unexplored country. 



AURICULELLA. All the Auriculella are arboreal. They are 

 all also oviparous. They are usually found on the leaves of 

 ferns, shrubs and trees, though a few of the species seem to 

 prefer the twigs and branches. This genus also contains 

 practically all the species of the family which are particolored. 



In the mountains about Honolulu, A. auricula is found on 

 the leaves of all sorts of plants. A. diaphana is usually taken 

 on the ki (Cordyline terminalis) in the axils of the leaves, 

 but, where it is especially abundant, does not seem to be par- 

 ticular as to the kind of plant it lives on. A. perversa is usu- 

 ally found on the stems or branches of small trees or shrubs. 

 A. serrula is only found near the crest of the main mountain 

 ridge of Oahu. It seems to prefer the leaves of low-growing 

 Ichua (Metrosideros polymorpha). On Konahuauui, A. turri- 

 tella is usually found on the lower pinnae of a fern (Sadlcria 

 pallida ) . 



ELASMIAS. The species of this genus are usually found on 

 the leaves of trees, shrubs and ferns. They are rarely taken 

 on the branches or trunks except during rain. For such small 

 snails they are remarkably rapid in their movements. All 



