AMASTRA. 39 



A. HUMILIS SEPULTA P. & C., n. subsp. PI. 7, figs. 15, 16, 17. 



Smaller and especially narrower than other forms of 

 humilis; columellar fold strongly developed, a second low 

 fold occasionally present above the columellar fold (fig. 15). 

 Aperture small. 



Length 17, diam. 7, aperture 6.5 mm. ; iy 2 whorls. 



Length 15.5, diam. 6.5, aperture 6 mm. ; 7 whorls. 



Molokai : Moomomi, with the preceding. Cotypes 110595 

 A. N. S. P. and in Bishop Museum. 



This is much less abundant than A. h. moomomiensis in the 

 series taken, but it was not noticed in the field, where the 

 ground was gone over hastily. It may be that all of them are 

 from some particular bed. It is a point to be worked out 

 when these extensive beds can be gone over in detail. 



A. NUBILOSA GEORGII, U. Sp. PI. 7, figS. 6, 7, 8. 



The shell is larger than A. nubilosa, more slender than 

 A. n. macerata. Surface rather coarsely striate and conspicu- 

 ously malleate when not worn. Columellar fold smaller than 

 in the recent forms, often very small. 



Length 26, diam. 12.8, aperture 11 mm. ; 8 whorls. 



Length 23.5, diam. 12, aperture 10.2 mm. ; 7 whorls. 



Molokai : Pleistocene, in sand dunes at base of the bluff, 

 Moomomi, Cooke & Pilsbry, Jan. 30, 1913. Cotypes no. 

 109971 A. N. S. Phila. and in Bishop Museum. . 



This Amastra is rather rare in the dune deposits, associated 

 with A. humilis moomomiensis, Partulina dwighti occidentalis 

 and many smaller species. Named for Mr. George C. Cooke, 

 manager of the Molokai Ranch. 



Living A. nubilosa was taken by Dr. Cooke and myself 

 north of Meyer's place, in Puunea, probably the extreme 

 western limit of its range, and the nearest approach of the 

 living form to the locality of the fossil race of Moomomi. 



A. TRICINCTA Pilsbry. PI. 3, fig. 14 (embryo). 



Vol. XXI, p. 277. This species was found by us to be not 

 uncommon in a small ravine east of Puu Kolekole. It differs 

 from A. petricola by the thinness of the shell and total ab- 



