SUPPLEMENT TO VOL XXI. 



During the visit of the senior author to the Hawaiian 

 Islands in 1913, large accessions were made to the material 

 studied in the preparation of the Vol. XXI ; part from col- 

 lections made by the authors, part from the latest finds of 

 Messrs. Thaanum and Spalding. This material is herein 

 described. 



Family AMASTRID^E Pilsbry. 

 Subfamily LEPTACHATININ^E Ckll. 



Letachatinini COCKERELL, Science (N. S.) Vol. 37, p. 256 

 Feb. 14, 1913). 



Genus LEPTACHATINA Gould. 

 L. POPOUWELENSIS P. & C., n. sp. PI. 9, fig. 4. 



The shell is imperforate, narrow, the diameter slightly less 

 than one-fourth the length ; cinnamon-colored, glossy, weakly 

 marked with growth-lines. Whorls 7%, somewhat convex, 

 the last laterally flattened, tapering at the base. The aper- 

 ture is oblique, piriform. Outer lip is thin, obtuse, and 

 arches forward at the upper third. Coluniella short, obli- 

 quely truncate below ; fold weak. Parietal callus thin. 

 Length 8, diam. 2.1 mm., length of aperture 2.2 mm. 



Oahu : Western ridge of Popouwela, Spaldiug, Cooke and 

 Pilsbry. Type 110596 A. N. S. P. 



This species resembles the slender forms of the Diamond 

 Head Pleistocene. L. exoptabilis has a larger aperture and 

 differently shaped lip. In L. leiahiensis the columella differs. 

 L. scutilis has a much larger summit, and is less slender. 



