LYROPUPA. 257 



Length 2.75, diam. 1.15 mm. ; 6 whorls. Kaiiapou. 



Length 2.15, diam. 1.15 mm. ; 5 whorls. Lanai. 



Length 2.5, diam. 1.2 mm. ; 6 whorls. Maunalei, Lanai. 



Length 2.2, diam. 1.1 mm.; 5% whorls (Kona crater, 

 Hawaii). 



Kahoolawe: Hakioawa (type loc., figs. 1-3, 9), Kanapou and 

 Hanakanaea Bays (Cooke, Stokes and Pilsbry) ; probably 

 wherever fossils occur, as these places are near the north, 

 southeast and western angles of the island. 



Lanai : Maunalei (Forbes) . 



Molokai: Summit of Mauna Loa and at Moomomi (Cooke 

 and Pilsbry) ; Mauna Loa near the shifting sands and Kaiehu, 

 near Moomomi (Cooke). 



Hawaii: Kona crater (Thwing; pi. 22, f. 4, 8). 



This species, which seems to be widely distributed on 

 Kahoolawe, and the only Lyropupa known from that island, 

 differs from other Mirapupas by the better developed, longer 

 and continuous lower palatal fold. The enlarged inner end 

 of this fold represents the iipper of the two tubercles of the 

 inner barrier of the other species. The Kahoolawe species 

 is also characterized by the sculpture and thin shell. No 

 specimens were collected alive, though some appear fresh. 

 The island is now a mere desert, many square miles without 

 humus or herbage of any kind. At the third locality it was 

 found but a few feet above sea level ; at the others in aeolian 

 material at higher levels, up to several hundred feet above 

 the sea. 



Specimens from Hawaii (no. 119466 A. N. S., 12438 Bishop 

 Mus.) are somewhat more solid than those of Kahoolawe. In 

 the specimen figured there are about 20 ribs on the last whorl 

 (pi. 22, figs. 4, 8). 



In Molokai this species is somewhat widely distributed on 

 the treeless western part, as a fossil of Pleistocene and more 

 recent age, sometimes in aeolian deposits of calcareous sand, 

 but on Mauna Loa under stones where they lived. Usually 

 the lower palatal fold is shorter, its inner half higher than 

 typical, and the tubercle below it is generally strongly de- 

 veloped (pi. 26, fig. 13, Mauna Loa, near the shifting sands). 



