228 LYROPUPA. 



L. perlonga, Oahu, a subspecies in Niihau and Kauai. 



L. lyrata, Oahu, a variety in Kauai. 



L. micra, Oahu, a subspecies in Molokai. 



L. ovdtula, Oahu, a subspecies in Molokai and Hawaii. 



L. rhabdota, Molokai, a subspecies in Lanai and Maui. 



L. kahoolavensis, Molokai, Lanai, Kahoolawe and Hawaii. 



L. kahoolavetisis shows very little variation throughout its 

 range. It inhabits more islands than any other species, and is 

 one of the most primitive. It occurs 011 4 islands as a fossil 

 only. 



Except in the case of L. ovatula, the islands inhabited by 

 one species are always contiguous. Probably some race of 

 ovatula (also of kahoolavensis) will be found on Maui, where 

 the Pupillidae are much less known than on other islands. 

 If so the single exceptional case will be eliminated. 



Niihau and Kahoolawe each have but one species also found 

 on the contiguous islands. 



Species of the islands from Molokai east are closely related, 

 but Molokai also connects with Oahu, having three fossil sub- 

 species of specific stocks which are widely spread on Oahu. 

 Otherwise the species of the eastern group of islands all differ 

 from those of Oahu and the western islands. 



In general, the distribution of Lyropupa agrees with Lept- 

 ^chatima. The orderly sequence of species and subspecies 

 from island to island, as well as upon the single islands, sug- 

 gests migration over continuous land, and gives no ground for 

 the hypothesis of carriage by wind, birds or other accidental 

 or unusual means, which would surely have produced a less 

 harmonic distribution. 



In the following table r signifies recent, / fossil forms; fr 

 denotes forms chiefly known as fossils, but also rarely found 

 living. 



