iNE \VCOMBIA. > 



white. Peristome expanded, with a white lip within; colu- 

 mellar margin recurved. Length 18, diam. 8, aperture 8x6 

 mm. Halawa, eastern Molokai (Borcherding*) . 



In N. p. gemma, as in typical plicata, the Iira3 are variable in 

 arrangement and number, no two specimens being quite alike. 

 Figs. 8, 10, 11 represent typical gemma, while figs. 4, 5, 7 are 

 the " costata' ' type, intermediate between plicata and gemma. 



2. N. SULCATA (Pfeiffer). PL 2, figs. 9, 10; pi. 14, figs 9, 

 10, 11. 



Shell subperforate, sinistral, oblong-turrited, rather solid 

 striatulate, and encircled with close Iira3, which are compressed 

 in the upper whorls, then rounded; chestnut colored, somewhat 

 shining. Spire regularly tapering, the apex rather acute; suture 

 nearly simple. Whorls nearly 6, rather flat, the upper flamed 

 with white, the last about two- fifths the length, the base saccate, 

 of a deeper chestnut shade. Columella very lightly folded. 

 Aperture oblique, acuminate-oval; peristome thin, the colu- 

 mellar margin dilated above, reflexed, outer margin a little ex- 

 panded. Length 12J, diam. 5f mm. Aperture 5f mm. long, 

 3J wide. Sandwich Is., Frick in Cuming coll. (Pfr. ). 



Molokai: Ahaina (D. Thaanum). 



Achatinella sulcata PFR., Malak. BL, iv, 1857, p. 231; Mono- 

 graphia, iv, 560; P. Z. S., 1858, p. 22. Newcombia sulcata Pfr., 

 SYKES, Fauna Hawaiiensis, p. 332, BORCHERDING, Zoologica, 

 p. 97, pi. 9, f. 4, 4a. Not of Baldwin, Catalogue p. 8, or of 

 Gwatkin, Proc. A. N. S.. Phila., 1895, p. 238 (radula). 



" This species can be confused with no other. The whorls 

 are regularly, obsoletely, transversely striate, increasing in 

 strength to the last whorls and disappear on the lower half of 

 the last whorl. The color is red-brown, becoming more intense 

 with the increase of the w r horls, and on the last whorl it is quite 

 shining dark red-brown. The same analogy which exists be- 

 tween plicata and costata is here found between canaliculata and 

 sulcata. 1 (Borcherding, from specimens in the Hartman collec- 

 tion, probably received from Newcomb. ) 



Collectors of the present generation seem not to have found 

 this species until it was taken by Mr. Thaanum at Ahaina. 



