AMERICAN JOURNAL 



REMARKS ON THE SPECIES OF MELANIA AND LIMNiEA 

 INHABITING THE HAWAIIAN ISLANDS, WITH DE- 

 SCRIPTIONS OF NEW SPECIES. 



BY WxM. HARPER PEASE. 



Having made extensive collections of the species of the above 

 genera the past year, on several of our islands, especially Kauai, 

 ■which is by far the best watered of our group, I furnish here- 

 with the facts I have been able to gather. 



LIMN^A, Brug. 



Eight species of this genus have been described as inhabiting 

 the Hawaiian Islands, viz : 



L. Oahuensis, Soul., volutata, Gld., Sandto'ichensis, Phil., 

 affinis, Soul., rubella, Lea ; also, Physa producta, Migh., um- 

 bilicata, Migh., reticulata, Gld. 



Having examined the animals of several hundred specimens, 

 from various localities, I am confident that no species of Physa 

 inhabit the islands, however closely the shells may resemble that 

 genus. 



The animals of the several species above differ but little in 

 their general shape and proportions. The foot extends beyond 

 the head when in motion. When the animal is at rest or feeding 

 the tentacles are subulate, somewhat flattened laterally, and 

 swollen at their inner bases, on which the eyes are situated. 

 When fully extended they assume a cylindrical shape, sharply 

 pointed, and the protuberance at the base scarcely perceptible. 

 The mantle does not project outside the shell. 



Sinistral and dextral specimens of the same species are found 

 in company with each other; the latter are rare at all localities. 



All the species may be referred to two types, which may be 

 distinguished by the characters of their columella. 



1. Represented by Oahuensis, Sowb., the columella furnished 

 with a fold, more or less twisted, and, with few exceptions, either 

 colored or stained reddish, which includes the following species : 



