MOLLUSC A 273 



The following general conclusions may, however, be drawn : 



1. The Molluscan fauna is nearly related to that of the Polynesian islands, and 

 shows hardly any trace of continental influence, Asiatic or American. 



2. The species are nearly always confined to one island ; but it is very doubtful 

 if, as has been stated, "each valley has its peculiar species." 



3. When the genera found are confined to the islands, the majority of living 

 species usually occur on Oahu. 



I give below tables of distribution ; but, owing to the fauna being so restricted in 

 distribution, have not added percentages of peculiar species. 



(i) Families Limacidae, Zonitidae, Endodontidae, Helicidae, Pupidae. 



Species peculiar to one Island. 



Pupidae. Total. 



1 1 



4 14 



2 



3 



8 



Species occurring in more than one Island. 



Limacidae. Two species (Z. gagates and Agriolimax laevis) are found elsewhere, 

 and may have been introduced. One species is common to Kauai and Maui, one to 

 Maui and Hawaii, and one to Kauai, Oahu, and Maui. 



Zonitidae. One species common to Kauai, Oahu, and Maui ; one to Oahu, 

 Molokai, and Lanai ; and one, respectively, to Kauai and Maui, Maui and Oahu. 



Philomycidae. One found in Kauai, Oahu, and Hawaii, and one in Oahu only; 

 these species, however, are not peculiar to the Hawaiian fauna. 



Endodontidae. Two species are common to Kauai and Oahu ; one, respectively, 

 to Kauai and Lanai, Maui and Oahu, Lanai and Oahu, Lanai and Molokai ; while 

 three are of uncertain habitat. 



Helicidae. One species — introduced — in Kauai and Oahu. 



Pupidae. One in Kauai, Oahu, and Hawaii ; one, respectively, in Kauai and 

 Oahu, Oahu and Hawaii ; further, a single species is found outside the Islands. 



^6 — 2 



