1 82 Original Descriptions of Achatinella. 



this and the preceding species I am indebted to Rev. Mr. Johnson 

 of Koloa. It is named after the eminent naturalist John G. 

 Anthon}^ Esq., of Cincinnati, Ohio. 



The specimen seledled for figuring is more obese than usual, 

 and less elongated. A well marked variety has the last whorl of 

 pale straw. — Newc. 



Hab. Kauai. — Bald. 



338. Achatinella kauaiensis Newcomb. 



A. kauaiensis Newc. Am. Jour. Conch., ii. 1S66, p. 209, pi. xiii, fig. i. 



Shell imperforate, dextral, trochiform, solid, strongly striated 

 and decussated, above blackish-brown, the carina and base dirty 

 white colored; suture crenulated, 7 whorls, flath' convex, the last 

 with a cord-like keel in the middle; aperture irregular h' quadrate; 

 columella short, twisted, with one fold. Long. 9-10, lat. 8-10 in. 

 Aperture, long. 4-10, lat. 5 1-4/10 in. 



Remarks. This is undoubtedh' one of the most singular forms 

 presented in the genus, and of extreme rarity. The specimen 

 selecfted for the figure varies from the type in being provided upon 

 the back of the last whorl with three instead of one keel. Kauai 

 is the most western of the large islands of the Sandwich group, 

 and by geologists is considered as the oldest of the series; and it 

 is worthy of remark that not a typical arboreal species of this 

 genus has been met with, nor one ornamented with a variety of 

 painted patterns, as upon the islands farther east. — Newc. 



Hab. Kauai. 



339. Achatinella knudsenii Baldwin. 



Aniaslra k)iudsenii Bald. P. Ac. Phil., 1895, p. 231, pi. xi, figs. 43, 44. 



Shell dextral, imperforate, solid, elongately ovate, spire coni- 

 cal, apex subacute ; surface lustreless, coarsely and irregularly 

 wrinkled by growth striae ; embryonic whorls very finely radiately 

 sulcated; color very dark brown, tending to a lighter shade on the 

 elevated portions of the lower whorl; whorls 7, the three lower 

 ones strongly angulated a little below the suture, the last one with 

 a cord-like keel at the peripher}' and numerous coarse cross striae 

 above and below the periphery; suture well impressed; aperture 

 oblique, elongately oval, dark purple inside with a satin-like lustre; 

 peristome acute, not thickened within; columella terminating in a 

 long, narrow, flexuous, pearly-white plait. Length' 33, diam. 

 17 mm. 



Both this species and Amastra kauaiensis Newc. are charadler- 

 ized b}- the long, flexuous thread-like columellar plait which is 



