LYROPUPA. 265 



18. LYROPUPA OVATULA C. & P., n. sp. PL 23, fig. 11 ; pi. 24, 

 tigs. 1 to 5. 



The shell is of shorter, wider shape than L. perlonga, taper- 

 ing more upwards. Whorls convex, the first 1% sinoothish, 

 the rest sculptured with curved ribs stronger than in L. per- 

 l&nga, subequally spaced, retractive on the spire, more nearly 

 vertical on the last whorl, where there are about 16, standing 

 nearly 0.2 mm. apart on the face of the whorl. The last 

 whorl has three impressions on the last half : a long, deep and 

 wide impression below the middle, the others shorter and 

 sharper. The base has a prominent, straight crest (pi. 24, 

 fig. 2), divided by the inferior impression, the ribs passing 

 over it being small or obsolete. Its posterior end forms a 

 rounded hump. The angular and parietal lamellae are longer 

 than in L. perlonga. The vertical columellar lamella is 

 crescentic, the concavity towards the aperture, and much more 

 curved than in L. perlonga. The upper palatal fold emerges, 

 and penetrates to the dorsal side. Below its inner end there 

 are two callous nodules, as usual (pi. 24, fig. 4). There is a 

 low but rather strong lower palatal fold, and a small basal 

 fold. The peristome is rather well expanded. 



Length 2.25, diam. 1.3 mm. ; 5y 2 whorls. Kailua. 



Length 2.1, diam. 1.25 mm. Kailua. 



Length 2.2, diam. 1.28, ap. .85 mm.; 5 whorls. Manoa, 

 pi. 23, fig. 11. 



Oahu : Kaelepulu, Kailua, in crevices and along the base of a 

 low lime-rock bluff about 14 m ^ e from the shore (Pilsbry) ; 

 Rocky Hill, Waimanalo and Koko Head (Cooke). It has only 

 been found fossil. 



The peculiar basal crest is the most conspicuous external 

 feature of this species. Internally, the longer parietal lamella 

 and the markedly crescentic columellar lamella distinguish it. 

 At Kaelepulu the type locality (pi. 24, figs. 1-3, 5) it occurs 

 with L. perlonga, L. micra etc., all being abundant. 



The specimens are all dead, apparently being Holocene 

 fossils. They vary in color from vinaceous-cinnamon to cart- 

 ridge-buff, or of the former tint with a cartridge-buff median 



