LYROPUPA. 237 



seated and closer to the angular than in the typical form. 

 Lower palatal fold converging towards the upper inwardly, 

 its inner end enlarged and curving towards the base. 



Length 2.4, diam. 1.4 mm. ; 5% whorls. 



Length 2.55, diam. 1.5 mm.; 5y 2 whorls (type). 



Length 2.2, diam. 1.35 mm. ; 5 whorls. 



Oahu: Coral bluff 1% miles west of Kahuku (Cooke and 

 Pilsbry, type loc.) ; Malaekahana, Kaipapau, Laie and Punaluu 

 (Cooke). Fossil in Pleistocene and later deposits. 



The essential character of this northwestern race is the hook- 

 like shape of the lower palatal fold. In L. lyrata it is nearly 

 straight. 



In its typical form the race appears to be extinct, yet there 

 are some living forms which approach it and are referred here 

 provisionally. 



Recent specimens from Kamanaiki, Kalihi, show some ap- 

 proach to the fossil form. The lower palatal has an enlarged, 

 slightly decurved inner end, which is almost separated from 

 the low outer portion. Those collected living in Glen Ada, 

 Nuuanu, have the lower palatal fold strongly hooked down- 

 ward (pi. 19, iig. 10). The external shape varies from some- 

 what conic to that of uncifera. The variations and races of 

 lyrata will not be understood until specimens from a large 

 number of places are opened for study of the palatal folds. 

 It will probably be found necessary to recognize a number of 

 local races. 



Kauaian race. A slightly larger race which appears closely 

 related to this subspecies though not identical, is found in 

 a fossil state on Kauai at Limahuli (Dole, Cooke) and Haena 

 (Cooke) . The shells agree with uncifera in having the parietal 

 lamella very deeply seated and close to the angular lamella, 

 but the lower palatal fold is low and rather wide, and its 

 inner end descends very little. One of the specimens meas- 

 ures: Length 2.62, diam. 1.45, alt. apert. 0.95 mm.; whorla 

 5 Va- A specimen from Limahuli is drawn in pi. 20, fig. 1. 



Ife. Lyropupa, lyrata fossilis C. & P., n. subsp. PL 19, figs. 

 7, 11. The shell is longer and narrower in proportion to its 



