16 PAUAHIA, CARELIA, PTERODISCUS. 



have the axis simple above the last whorl, the internal pro- 

 cesses being absorbed. This species was found by us also on 

 the western ridge of Popouwela, in the Waianae mountains, 

 together with P. tantilla. 



P. (?) SEMICOSTATA (Pfeiffer). PI. 9, fig. 12. 



Vol. XXI, p. 65. The numerous, closely coiled whorls, the 

 short last whorl and narrow mouth, give reason for believing 

 this species will turn out to belong to Pauahia. We cannot 

 find a satisfactory place for it in any other group of Lept- 

 ackatina. The figure was prepared under the eye of Mr. 

 E. A. Smith, and represents the type-specimen in the British 

 Museum. It has not been figured before, and has not been 

 rediscovered by Hawaiian conchologists. 



Sub-family AMASTRIN^. 

 Genus CAEELIA Ads. 



Carelia adust a in both plain and bicolored forms is in Mr. 

 Joseph Emerson's collection from Haena. C. cumingiana 

 in the same collection is labeled as from the koolau or north- 

 ern district of Kauai. 



C. OLIVACEA Pease. PL 9, figs. 11, 15. 



Vol. XXI, p. 106. Specimens in the Pease collection, no. 

 23343 Mus. Comp. Zoology, are here figured. The larger one 

 is not the type of olivacea, which was still larger. The smaller 

 may be the type of Pease's var. viridis. Both are "dead' 1 

 shells which have lost nearly all of the periostracum. The 

 aperture is narrower and longer than in C. hyattiana, and the 

 columella is much more deeply arched. The outlines of the 

 spire are more convex, and the last whorl is less angular. 



Length 52, diam. 17.25 mm. ; 8 whorls. 



Length 42, diam. 15 mm. ; 7~y 2 whorls. 



Genus PTERODISCUS Pilsbry. 



Vol. XXI, p. 118. Snails of this genus live on sticks and 

 dead leaves, on steep, moist, well-shaded slopes. They are 

 very hard to find, the irregular shape and dark color of the 



