LYROPUPA. 259 



peristome continuous, scarcely everted. Length 2.5, diam. 

 1mm." (Pease). 



Oahu : (Pease) . Very abundant in pleistocene and holocene 

 deposits on the costal plain of Oahu, Diamond Head eastward ; 

 Kailua ; living examples from Koko Head. 



Vertigo perlonga PEASE, Proc. Zool. Soc. London, 1871, p. 

 462. Pupa perlonga PFEIFFER, Mon. Hel. Viv., viii, p. 377. 

 BOETTGER, in von Martens, Conchologische Mittheilungen, i, 

 1880, p. 60, pi. 12, f. 16. Nesopupa (Lyropupa) perkmga, 

 PILSBRY, Proc. A. N. S. Phila., 1900, p. 432. Lyropupa, per- 

 longa ANCEY, Proc. Malac. Soc. London, vi, 1904, p. 126. 



This is the most widely distributed and commonest Oahuan 

 species of Lyropupa. Numerous specimens of the typical 

 form or of one of its races are found in most of the fossil 

 deposits adjacent to the Koolau range. Living examples are 

 only occasionally found and are hardly ever abundant ; as far 

 as known, less than a dozen lots have been reported. In every 

 case where the junior author found living examples they were 

 taken in open country under dead sticks and stones. Only 

 once were they found in any number, and that was near the 

 top of Koko Head, at an elevation of about 1,000 ft. 



Pease's unique type specimen, No. 48063 Mus. Comp. Zool., 

 is drawn in pi. 23, fig. 1, with the aperture enlarged, fig. 2. 

 It is a fossil shell, a good deal worn, the ribs worn from the 

 upper part, giving it a more tapering outline than it origin- 

 ally had. There are about 17 narrow ribs on the last whorl, 

 0.17 mm. apart on the face of the whorl, closer behind the lip, 

 part of them extending over the strong basal ridge, which 

 has an obtuse hump in the middle, preceded and followed by 

 dimples, visible in basal view. The outer edge of the lip is 

 broken away. The angular lamella is long, parietal lamella 

 higher, entering deeply, emerging to the middle of the angular* 

 The columellar lamella is seen as a broad, vertical plate, in 

 front view. Upper palatal fold emerging to the lip. Lower 

 palatal fold a low, callous nodule. Internal barrier, so far as 

 it is visible in the mouth, as in pi. 24, fig. 7. Length 2.1, diam. 

 1.05 mm. 



The dimensions do not agree fully with Pease 's description, 



