124 PROCEEDINGS OF THE ACADEMY OF [1887. 



THE TERRESTRIAL MOLLTJSCA INHABITING THE SAMOA OR 

 NAVIGATOR ISLANDS. 



BY ANDREW GARRETT. 



The earliest notice we have of the land-shells of the Samoa Is- 

 lands, was published by Dr. Gould in the "Proceedings of the Bos- 

 ton Society of Natural History" for 1846 and 1847, and subsequently 

 redescribed and figured in the "Mollusca and Shells of the United 

 States Exploring Expedition." He described 14 new species. 



In 1865, Prof. Mousson published in the French Journal of 

 Conchology a list of the land and fresh-water shells of Samoa, based 

 on the collections made by Dr. Griiffe. He enumerated 29 species 

 of land-shells, 14 of which were new to science. In 1869 he pub- 

 lished a second list in the same journal and brought the number of 

 species up to 48, 11 of which were described as new. 



In the following pages the writer records 65 species, 32 of which 

 are endemic ; the others having a more or less extensive range 

 throughout Polynesia. 



MICROCYSTIS, Beck. 

 M. Upolensis, Mousson. 



Nanina Upolensis, Mousson, Jour, de Conch., 1865, p. 166; (Mi- 

 crocystis) 1869, p, 327, 1870, Var. Oneataensis, p. 114. (Thalassia) 

 Paetel, Cat. Conch., p. 85. Schmeltz, Cat. Mus. Godeff., v, p. 90. 



Helix Upolensis, Pfeiffer, Mon. Hel., v. p. 108. 



Helicopsis Upolensis, Pease, Proc. Zool. Soc, 1871, p. 475. 



Helix Samoensis, Baird, French Cruise of the Curacoa. 



I gathered numerous specimens of this species in the forests back 

 of Apia village at Upolu Island, where Dr. Griiffe found the type 

 examples. The Doctor subsequently discovered it at Vanua, Balavo, 

 and Oneata in the Viti Islands. 



It may be characterized by its depressed orbicular form, smooth, 

 highly polished surface, pale horn color, 5 slightly convex whorls 

 and slightly nodulous columella. Diam. 62 mill. A strictly terres- 

 trial species, living beneath decaying leaves and under rotten wood. 



M. perpolita, Mousson. 



Nanina (Mici'ocystis) perpolita, Mousson, Jour, de Conch., 1869, 

 p. 326, pi. 14, fig. 1 ; 1870, p. 113 ; 1871, var. solida, p. 8. Schmeltz, 

 Cat. Mus. Godeff, v! p. 90. 



