260 LYROPUPA. 



but his measurement was doubtless only approximate. He 

 gave the locality Oahu, and the label (in Anthony's hand) 

 gives Nnuanu. It was probably from some Holocene deposit 

 at a low level. 



Specimens from the bench of calcareous sandstone east of 

 Diamond Head agree closely with the type specimen (pi. 23, 

 figs. 3, 4, 5; also pi. 24, figs. 6, 7, showing the lamellae and 

 an inside view of the palatal region ) . 



The summit is blunt ; the embryonic whorls are coarsely 

 wrinkled-granulose ; the first three whorls increasing rapidly, 

 the third whorl swollen, as broad as the last two; the later 

 two or three whorls are slightly swollen below the suture, the 

 last whorl tapering and narrowing below ; there are about 18 

 costae on the last whorl, the back of which is trisulcate, the 

 uppermost sulcus long, shallow and broad, lightly indicated 

 on the penult whorl, the two lower being short, dimple-like; 

 the margin of the peristome is free; the angular lamella is 

 long and low, extending to the margin; the parietal more 

 deeply seated, emerging to the middle of the angular; the 

 columellar lamella is deeply seated, its upper part vertical, the 

 lower end sloping towards the aperture somewhat. In shape 

 it is a semi-circular plate, slightly concave on the side next 

 the aperture. The upper palatal fold is long, slender, its 

 crest only slightly sinuated where approached by the angular 

 and parietal lamellae. The lower palatal fold is nodule-like, 

 low and short; beyond it, further in, there is a strong, tri- 

 angular or comma-shaped barrier, a lower callus below it (pi. 

 24, fig. 7, interior view of palatal wall). Specimens from the 

 raised bench of consolidated coral sand east of Diamond Head 

 measure : 



Length 2.45, diarn. 1.05, aperture 0.8 mm. ; 5y 2 whorls. 



Length 2.25, diam. 1.1 mm. 



Length 2, diam. 1 mm. ; 5 whorls. 



The same typical form is found on Diamond Head near 

 the lighthouse, and on the floor of the crater. All of these 

 are fossil. 



Living specimens collected 011 Koko Head (pi. 23, fig. 6; pi. 

 26, figs. 4, 7) are brussels brown in color, they are slightly 



