216 AMERICAN JOURNAL 



13. Achatixella Alexandri, Newcomb. 



Proc. Acad. Nat. Sci., Sau Francisco, Jan., 1864. 

 Plate 13, fig. 14. 



Description. — Shell perforated, left-handed, elongately sub- 

 cylindrical, shining, reddish-brown, with painting of elongate, 

 inosculating black veins ; whorls 6, convex, regularly, but 

 slowly, increasing ; apex a little obtuse ; suture moderately 

 impressed, not emarginate; aperture small, sub-ovate; lip 

 acute ; columella white, short, almost straight, truncate, ter- 

 minating by a twisted plait passing within. 



Long. '6, diam. - 25 inch. 



Remarks. — This species is more cylindrical than any of its 

 congeners, resembling most A. Remyi, Newc, which is longer, 

 not umbilicate, more pointed at the apex, with a twisted, not 

 truncate, columella. 



From venusta and citrina, Mighels, it varies both in form 

 and color. With some varieties of picta it claims analogy 

 only in the general plan of painting. Its striking character- 

 istics are its blunt apex, slightly rounded whorls, small aper- 

 ture, short and white columella, umbilicus, and general plan 

 of coloring. 



A few specimens were collected at an elevation of 7,500 

 feet, on West Maui, by the Rev. M. Alexander, to whom the 

 species is dedicated. 



14. ACHATINELLA UNDULATA, NewCOmb. 



Proc. Boston Soc. Nat. History, 1855. 

 Plate 13, fig. 15. 



Description. — Shell sinistral or dextral, rather solid, acutely 

 conical, shining, polished, with longitudinal oblique fine stria?, 

 microscopically spirally striate ; whorls 6, rounded and mar- 

 gined above ; suture well impressed ; aperture sub-ovate ; 

 columella short and plicately twisted ; lip acute, thickened 

 within. Color light olive to chestnut, alternating with slightly 

 undulating chestnut or black lines and bands, rarely marked 

 by transverse black fascite ; columella and aperture white. 



Long. 3 § poll.; lat. 3 6 q poll. 



Habitat. — Waialua, Oahu. 



Remarks. — This species, very variable in color and size, has 

 in all cases the undulating markings by which it acquires its 

 name. The specimen illustrated varies in the latitude from 

 that given above by 3 2 c of an inch, and is more obese in conse- 

 quence. 



