1 895. ] 



NATURAL SCIENCES OE PHILADELPHIA. 235 



Color very dark brown, tending to a lighter shade on the elevated por- 

 tions 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 periphery and numerous coarse cross striae above and below 

 die 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, 

 Hexuous, pearly-white plait. 



Length 33; diam. 17 mm. 



Habitat: Halemanu, Island of Kauai. 



Both this species and Amastra Kauaiensis Newc. are characterized 

 by the long, flexuous thread-like columellar plait which is peculiar 

 to the genus ( 'arelia of Kauai. Examination of the animals may 

 prove them both aberrant forms of that genus. 



The species is very rare. We dedicate it to Mr. A. Knudsen," the 

 young naturalist who discovered it. He writes that, it is of very 

 limited distribution, being found far up the mountain only in an 

 isolated tract of wood land which escaped the forest fires of twenty 

 years ago. In three days' diligent search he found only twelve 

 living examples. 



EXPLANATION OF PLATES. 



The figured types are, with the exceptions noted below, in the col- 

 lection of the Academy of Natural Sciences, bearing the numbers 

 quoted in parenthesis. 



Plate X. 



Figures. 



Figs. 1, 2. Achatinella multizonata Baldwin (65,703) 



" 3, 4. Achatinella Juddii Baldwin (65,709) 



" 5, 6. Achatinella Ernestina Baldwin (65,706) 



" 7,8. Achatinella luteostoma Baldwin (65,704,65,70"), 



" 9. Achatinella Lyonsiana Baldwin (65,693) 



" 10. Achatinella Lyonsiana var. (coll. Baldwin) 



" 11. Achatinella Lyonsiana var. (65,694) 



" 12, 13. Achatinella Lymaniana Baldwin (coll. Baldwin) 



" 14. Achatinella vespertina Baldwin (65,699) 



" 15. Achatinella Cookei Baldwin (65,692) 



