THE NAUTILUS. 35 



columella white, flexuous, terminating in a moderately-developed 

 lamellar plait. 



Length 20^, diam. 10 mm. 



Habitat : Kau, Island of Hawaii. 



Tliis shell seems to live among and under rocks to an unusual 

 deree. It is found on old lava Hows attached to the under side of 



o 



rocks, or in loose soil and trash at the base of bunch grass growing 

 on lava flows. The locality is very arid. 



Amastra senilis n. sp. 



Shell fossil, dextral, deeply perforated, the perforation penetrating 

 to the apex; moderately solid, globose with a short conical spire, 

 apex acute ; surface sculptured with coarse, irregular growth lines, 

 with a few irregular cross striae or ridges on the three lower whorls ; 

 embryonic whorls under a lens exhibiting delicate and regular sulca- 

 tions. Color of the living shell unknown. Whorls 7, convex. 

 Aperture siuuately oval, a little oblique ; peristome simple, acute, 

 not thickened within, extremities joined by a thick parietal callosity; 

 columella terminating in a slight, flexuous fold. 



Length 23, diam. 18 mm. 



Habitat : Hamakua, Island of Hawaii. 



This and the following species were discovered and sent to me by 

 Mr. Eugene Horner, of Paauila, Hawaii. They were found at a 

 place called Palihoukapapa on the Hamakua slope of Maunakea, at 

 an elevation of 4,000 feet. The shells were imbedded in the earth 

 about one foot below the surface. 



Prof. Henshaw reports other similar localities on the island of 

 Hawaii where there are extensive deposits of fossilized land shells 

 about a foot below the surface of humus. Nearly all the known 

 genera of Hawaiian land shells are represented in these deposits by 

 species, some still extant, others probably now extinct. The deposit 

 of earth above the fossilized shells indicates several hundred years 

 antiquity. 



Amastra fossilis n. sp. 



Shell fossil, dextral, minutely perforated, somewhat solid ; elon- 

 gately conical, apex rather acute ; surface striated with somewhat 

 irregular growth lines ; embryonic whorls under a lens exhibiting 

 very delicate and regular sulcations. Color of living shell unknown. 



