256 LYROPUPA. 



ends of the lower palatal and basal folds, which are otherwise 

 reduced or sometimes absent. The structure is strictly com- 

 parable to that of some Abidas, such as are illustrated in vol. 

 24, pi. 44, fig. 6. L. kahoolavensis is a relatively primitive 

 species not showing 1 this specialization. Among the sinistral 

 Lyropupa* there is similar interruption of the lower palatal 

 fold in L. mirabilis. 



15. LYROPUPA KAHOOLAVENSIS P. & C., n. sp. PL 22, figs. 1 to 

 4, 8, 9. 



The shell is cylindric, obtuse at the ends, cinnamon-brown, 

 very thin. Earlier whorls are strongly convex, the last two 

 flattened in the middle, bulging below the deep suture. Em- 

 bryonic 1% whorls are granose-vermiculate, the next whorl 

 closely obliquely ribbed. The last 3 whorls, forming the cylin- 

 dric portion, have widely spaced ribs, at first continuous and 

 oblique (retractive), but on the last two whorls they are 

 subvertical and widely spaced on the upper half of the whorl, 

 interrupted in the middle, and on the lower half more oblique 

 and irregular, and more numerous; minute spiral striae may 

 be traced in the intervals. The last whorl has three impres- 

 sions parallel to the suture, the upper long, reaching the lip, 

 the others short, the third one being basal. The aperture has 

 the usual squarish form. Peristome continuous, expanded, 

 whitish. Lamellae of parietal wall as in L. perlonga except 

 that the parietal does not penetrate so deeply. The columellar 

 lamella is very deeply placed, vertical, but the lower end bends 

 a little outward, the upper end bending inward. The upper 

 palatal fold enters about one-third of a whorl. The lower 

 palatal is immersed, continuous, bent downward and enlarg- 

 ing at the inner end, which is even with that of the upper 

 palatal. Below it there is a tubercular basal. 



Length 2.15, diam. 1.05 mm. ; 5% whorls. Type, Hakioawa 

 Bay. 



Length 2.3 mm. ; 51/2 whorls. 



Length 2.4, diam. 1.2 mm. Hanakanaea or Smuggler's Bay. 



Length 2.6, diam. 1.2 mm. Kanapou. 



Length 2.55, diam. 1.15 mm. Kanapou. 



