LEPTACHATINA. 5 



in the sand dunes near the shore, there are small shells, like 

 those of Laie. 



PI. 10, figs. 5, 6. The shell deposits on benches of the high 

 coral bluff iy 2 miles west of Kahuku are very rich in Lep- 

 tachatinas. The oryza are usually markedly conic in shape, 

 quite different from the cylindric race of Diamond Head. 

 The perforation is very narrow or closed, and the columella 

 is shortened. Size from 8 x 3.7 to 7 x 3.3 mm. 



L. oryza hesperia n. subsp. PL 10, figs. 10, 11. 



The shells vary from openly perforate to nearly closed, 

 have weak, irregular, not very fine, wrinkles of growth, 

 stronger below the suture. The columellar lamella is stronger 

 within than in oryza, and projects subhorizontally. Colu- 

 mellar margin and parietal callus heavy. 



Length 9.3, diam. 4.1, aperture 4 mm., 7 whorls (usual size) . 



Length 7, diam. 3.5 mm., 5y 2 whorls (small, obese form). 



Length 7, diam. 3.1 mm., 6% whorls (small narrow form). 



Oahu: Kawaihapai, in soil of a plowed field between the 

 railroad and the bluff, and on the latter. Haleiwa, on the 

 golf links, in superficial deposits of calcareous sand (Cooke 

 and Pilsbry). 



In the Haleiwa shells the perforation is almost closed, or 

 rarely entirely so. They measure 9 x 4 to 7.5 x 3.8 mm. 



It is smaller and usually a little narrower than L. captiosa, 

 with less ample aperture and more horizontal columellar 

 lamella. 



L. ORYZA AVUS Pilsbry & Cooke, n. subsp. PL 10, figs. 12 to 16. 



The shell is imperforate, cylindric, the upper third taper- 

 ing, conic; solid, very lightly sculptured with inconspicuous 

 growth-wrinkles, which are stronger, regular, and retracted 

 below the suture, when unworn. Whorls very slightly con- 

 vex. The suture ascends slightly in the last third or half 

 whorl. Aperture vertical, the outer lip obtuse, rather thick. 

 Columella concave above the fold which is moderately 

 prominent in front view, rather strong within. Columellar 

 margin thickened, reflected. Parietal callus thick. 



