14 PARTULINA. 



Genus PARTULINA Pfeiffer. 



Partulina PFR., Malakozoologische Blatter, i, p. 114, 1854 

 (for A. virgulata, tessellata, splendida, perdix, gouldi, dubia). 

 VON MARTENS, Die Heliceen, 1860, p. 243, type A. virgulata 

 High. GULICK, P. Z. S., 1873, p. 90, same type. SYKES, 

 Fauna Hawaiiensis, p. 311, same type. 



Includes as sections, Perdicella, Eburnella and Baldwinia. 



Shell ovate-conic, usually perforate, and having distinct 

 minute sculpture of spirally descending rippled stritz. Embryonic 

 shell after the first whorl spirally striate. Color pattern of 

 oblique stripes or spiral bands, the last embryonic whorl gen- 

 erally striped. Lip expanded more or less; columella folded or 

 almost simple. 



Type Partulina virgulata (Migh. ). Distribution, Molokai, 

 Lanai, Maui and Hawaii, one species on Oahu. 



The Achatmettina of the islands from Molokai southeastward 

 form a group of common ancestry, characterized by their spiral 

 and decurrent sculpture, perforate axis, oblique stripes and 

 spiral stria? on the early whorls, etc. Some or all of these 

 characters may fail in particular species, but their general prev- 

 alence leads us to believe them the heritage from a common 

 ancestral stock. The Oahuan Achatinettina do not possess the 

 sculpture and color-pattern noted above as characteristic of the 

 other islands, and evidently are more related inter se than to 

 any Molokai-Hawaii snails. Although the difference between 

 Oahuan and Molokai forms are sometimes elusive and not to be 

 laid down in formal diagnoses, yet it may be allowable to ex- 

 press, by a generic separation, the idea that we have to do with 

 two collateral stocks of arboreal snails, the one on Oahu, the 

 other on the islands eastward. 



Newcombia has the color and sculpture pattern of typical 

 Partulina, but with other special modifications which make it 

 advisable to treat that group as a genus. 



Several subdivisions or sections of Partulina have been named. 

 They are not of much systematic importance, and there are 

 some intermediate species; yet as they seem to be natural groups 

 we admit them here. 



