PAUAHIA. 15 



fossil in Nuuanu and Manoa valleys (Cooke), and "Ly 2 miles 

 west of Kahuku (Pilsbry & Cooke). 



L. pctila, specimens from Nuuanu and Manoa, Vol. XXI, 

 p. 92, pi. 4, f. 61-63 (Manoa), 64 (Nuuanu). 



This is larger and much darker colored than true L. petila, 

 and has a decidedly stronger columellar lamella. The outer 

 lip is thin, and the parietal callus merely a film. It is a shell 

 of the humid zone, which has not yet been found living east 

 of Halawa. The fossil material from Nuuanu and Manoa, 

 figured in Vol. XXI, seems to belong to this rather than to 

 the real L. petila. 



Mr. Gulick had one specimen from Kawailoa, now no. 

 1239!/^ Boston Society collection ; and there was one speci- 

 men in the lot of fossils (Pleistocene or later) which we took 

 on the "coral bluff," iy 2 miles west of Kahuku. 



Genus PAUAHIA Cooke. 

 Vol. XXI, p. 80. Type P. artata. 



As genera go in Achatinellidff, this group we think should 

 have generic rank. It differs from Leptachatina by the 

 closely coiled whorls and the development of internal lamellae 

 a strong columellar lamella which is broad and flares up- 

 wards in the penultimate whorl, diminishing in those above 

 and below, and a palatal lamina subperipheral in position, 

 about half a whorl long, in the penultimate and part 

 of the last whorl. In some species, as P. chrysallis, both are 

 absorbed in the adult stage ; in others (P. tantilla) they per- 

 sist. Both lamellae appear very early, being present before 

 the shell has attained three whorls (pi. 14, fig. 1, P. tantilla, 

 length 1.6 mm.). The soft anatomy is unknown except 

 the teeth. 



P. tantilla Cooke (Vol. XXI, p. 81) is found on the western 

 ridge of Popouwela in the "Endodonta locality" (Spalding, 

 Pilsbry and Cooke). An infant of this lot is figured, pi. 14, 

 fig. 1. 



P. chrysallis (Pfr.) has an internal axial lamella, double 

 at the edge, and a palatal lamina, in shells 8 mm. long, from 

 Kawailoa, coll. by Gulick. Adult shells of the same lot opened 



