90 REV. J. T. GULICK ON ACHATINELLIN.E. [Jan. 21, 



ever, in the supposition that Ferussac's use of the form "Helicteres" 

 had escaped the attention of other oonchologists. Dr. Pfeiffer has 

 referred to it, but there were sufficient reasons why he should not 

 use it. Beck and some others have followed Ferussac in adopting 

 the plural form of the word, while Pease uses the singular; but 

 whether the singular or the plural, it has been preoccupied as the 

 name of a genus in the vegetable kingdom. We might hesitate to 

 reject it if it had been in general use for many years ; but no good 

 reason exists for reviving an objectionable name which has long been 

 rejected. 



The group of small species provided with an internal lamella 

 resting upon the inner wall of the shell has already been removed 

 from the genus Partula by Dr. Pfeiffer. He has rightly estimated 

 their claim to a separate name, and to a place amongst the Achati- 

 nellinae. They should undoubtedly be regarded as a distinct genus, 

 and under Pfeiffer' s name Auriculella they will probably be received 

 as such. 



The group of large turreted species found only on the island of 

 Kauai, classed sometimes as Achatina, sometimes as Achatinella, 

 sometimes as Spiralis, finds its true place as a distinct genus under 

 the name Carelia (H. & A. Adams). This group, as well as Auri- 

 culella, should have a place in the Achatinellinae, but separate from 

 the genus Achatinella. 



With the addition of these forms, the Achatinellinse may be re- 

 garded as consisting of ten genera or convenient divisions. Seven 

 of these are arboreal, and three of them terrestrial genera. 



Achatinellinae. 

 A. Arboreal Genera. 

 1. Achatinella, Swainsou. 

 Syn. Achatinellastrum, Pfeiffer. 



Hab. Chiefly on the island of Oahu ; also on Molokai. 

 Type Achatinella vulpina, Fer. Hab. Pauoa, on Oahu. 



2. Bulimella, Pfeiffer. 

 Hab. Oahu. 



Type Bulimella rosea, Swain. Hab. Wahiawa and Helemano, 

 Oahu. 



3. Apex, Von Martens. 



Hab. Island of Oahu. 



Type Apex decora Fer. (syn. H. perversa, Sw.). Hab. Kawailoa, 

 on Oahu. 



4. Laminella, Pfeiffer. 

 Hab. Oahu, Maui, Molokai, and Lanai. 



Type Laminella gravida, Fer. Hab. East end of Oahu. 



5. Partulina, Pfeiffer. 

 Hab. Oahu, Maui, Molokai, and Lanai. 



Type Partulina viryulata, Migh. Hab. Molokai. 



