ACHATINELLA MUSTELINA. 349 



A. bicolor Gulick in Mus. Cuming, PFR., Monographia Heli- 

 ceorum Viventium, iv, 529, 1859. It was never described by 

 Mr. Gulick. 



40a. A. MUSTELINA SORDIDA Newcomb. PL 30, fig. 27 ; pi. 62, 

 figs. 5-11. 



"Shell elongately conical, solid; whorls 7, slightly rounded, 

 margined above ; aperture small, somewhat contracted ; lip 

 subreflected below, acute above, thickened within ; colurnella 

 short, slightly twisted, with an expanded callus partially cov- 

 ering a shallow, small umbilicus ; color variable, with a white 

 ground variously banded and striped transversely with brown 

 or black. Length eighteen-twentieths, width nine-twentieths 

 of an inch' (Newcomb). 



OahurLettui [Lihue] (Newc.). 



Achatinella sordida NEWC., P. Z. S., 1853, p. 139, pi. 23, f. 

 27. PFR., Monogr., iv, 523. Achatinella napus PFR., P. Z. S., 

 1855, p. 5, pi. 30, f. 19 ; Monogr., iv, 534. Cf. Newcomb, Ann. 

 Lye. N. H. of N. Y., vi, p. 308. 



The original figure is reproduced in pi. 30, fig. 27. 



This race differs from turbiniformis and concavospira by 

 its less convex whorls and straight-sided spire ; from muste- 

 lina-bicolor by the more slender contour. It varies a good deal 

 in color from fawn or Vandyke brown with a white sutural 

 band to white with some faint tawny suffusion or lines 

 towards the base. I understand that it occurs high on the 

 ridge, between the area occupied by mustelina and bicolor and 

 that of lymaniana and concavospira. There are transitional 

 forms between sordida and lymaniana. 



A. m. sordida is usually sinistral, but sometimes has a dex- 

 tral form, which was described as A. napus. 



"A. napus Pfr. [pi. 30, fig. 19, reproduction of original 

 figure]. Shell imperf orate, dextral, turrited, solid, striatu- 

 late, a little shining; whitish, encircled with grayish-fleshy 

 bands and sometimes chestnut lines ; spire long-conic, apex 

 white, acute ; suture distinctly margined ; whorls 6%, the 

 upper flat, following slightly convex, the last whorl about 

 equal to one-third the length, rounded ; aperture diagonal, 

 truncate-auriform, columellar fold superior, moderate, lightly 



