64 Original Descriptions of Achatinella , 



CASTA GROUP. 

 84. Achatinella casta Newcotnb. 



./. casta Newc. I'. Zool. Soc. London, 1853, P- x 34- pi- xxii. fig. 12. 



Shell conically elongate, solid, polished, shining, dextral or 

 sinistral ; whorls 6, rounded, margined above ; aperture subovate, 

 rather small ; lip simple, thickened within ; columella short, with 

 a strong plaited brownish tooth ; colour white or yellow, with ex- 

 tremely variable transverse bands of black, brown, pink or white, 

 variously arranged. Long. 13/20, lat. 6 1-2/20 poll. 



This species is readily distinguished from any yet described. 

 Its northern limit is the valley below Mouna Rua [sic'], and half a 

 dozen ravines, south, in the District of Ewa. — Newc. 



Hab. Ewa. — Newc. Halawa to Waipio. 



85. Achatinella pygmsea Smith. 



A. pygmaa Sm. P. Zool. Soc. London. 1873, p. 75, pi. ix, fig. 11. 



Testa sinistrorsa, ovato-conica, nitida, incrementi lineis transversimqne 

 exilissime striata, flavescens ; sutura leviter marginata ; anfract. 5 1-2, con- 

 vexi, primi 3 1-2 albi ; apertura alba ; perist. leviter limbatum ; plica colu- 

 mellaris mediocriter magna, rosea. Long. 14, diam. 8 mill. 



Var. Testa albida, linea snpra zonaqne brunnea peripheriam infra cincta. 



Shell sinistral, ovately conic, shining, transversely very finely 

 striated with lines of growth, light yellow; suture lightly margined; 

 whorls 51-2, convex, first 31-2 white ; aperture white ; lip lightly 

 edged ; columellar fold moderately large, rose. 



Var. Shell whitish, encircled above the periphery by a brown 

 line and below by a brown band. 



Affinities. It is somewhat allied to A. casta Newc, but is 

 much smaller and heavier in proportion to its size. — Sm. 



Hab. Waipio. — Sm. A 



86. Achatinella concolor Smith. 



!. concolor Sin. P. Zool. Soc. London. 1S73, p. 75, pi. ix, fig. 1. 



Testa sinistrorsa, ovato-conica, nitida, incrementi lineis et transversim 

 (anfract. p ri mis 3 modo) striata, flava (dilute brunneo interdnm strigata); 

 sntnra distincte marginata ; anfract. 6, convexi, primi 3 albidi ; apertnra 

 alba; perist. tenne; plica columellaris valida, rosea. Long. 19, diam. 10 mill. 



Shell sinistral, ovate-conic, shining, transversely striated on 

 the first 3 whorls only with lines of growth, yellow (sometimes 

 striped with pale brown); suture distinctly margined ; whorls 6, 



