Original Descriptions of Achatinella. 27 



a marine shell, and described, in his Systeme, under the name of 

 monadonta seminigra. This supposition cannot, however, be veri- 

 fied, unless by a reference to the specimen he described. It is also 

 rendered somewhat doubtful, as he does not quote the figures, in 

 Dixon's Voyage Round the World, which (although I have not 

 the book this moment before me) accurately represent my A. pica. 

 In this, as well as in all the other species, the thick and abruptly 

 truncated base of the pillar gives it the appearance of an obtuse 

 tooth, covered with a white enamel. The extreme margin of the 

 outer lip is acute, but it is internally bordered by a thickened rim. 

 These characters, in all the species I have yet seen, are strongly 

 developed, and render this group one of the most conspicuous in 

 the family of Hclici?ia." 



Hab. Islands of the Pacific Ocean. Waialua, foot of Kawai- 

 loa gulch. 



This is without doubt the same shell as A. lugubris Chem. 



SWIFTII GROUP. 

 28. Achatinella swiftii Newcomb. 



A. swiftii Newc. P. Zool. Soc. London, 1S53, p. 133 ; pi. xxii. fig. 9, ga. 



Shell ventricose, pointed at the apex, smooth, polished, shin- 

 ing ; whorls 6, slightly rounded above, the last strongly inflated, 

 distinctly margined above ; lip purplish rose, thick and slightly 

 subreflected ; aperture ovate ; columella short, terminating in a 

 tubercle of the color of the lip ; three first whorls white, the lower 

 with very fine and numerous markings of black and white arranged 

 longitudinally to the shell, giving it a grayish aspect : fine obso- 

 lete white lines traverse the shell transversely, and a white sutural 

 line is traced on the last two whorls. Long. 14/20, lat. 10/20 poll. 



Var. A. With a broad fascia cutting the body whorl. 



Var. B. Yellowish ground color, with few markings. 



Animal of a bluish slate, deeper on the head and tentacles, 

 and on the posterior part of the foot above ; longer than the shell ; 

 bottom of foot greenish white, mantle black. — Newc. 



Unfortunately the type figured in the Zoological Proceedings 

 is not the usual pattern of the shell, but is one of the more uncom- 

 mon varieties. — Newc. 



This species approaches A. turgida, but is distinct in appear- 

 ance, locality and habits. — Newc. 



