MOLLUSCA 361 
(20) Leptachatina costulosa Pease. 
Leptachatina costulosa Pease, P. Zool. Soc. London, 1869, p. 651 (nom. sol.) ; 
J. Conchyl. xvi. (1870), p. 90; Crosse, 1. c. xxiv. p. 96, pl. m1. fig. 4. 
Has. Kauai (Pease); Waimea and Kealia (Baldwin). 
(21) Leptachatina crystallina Gulick. 
Achatinella crystallina Gulick, Ann. Lyc. New York, vr. (1856), p. 186, pl. vi 
fig. 14. 
Newcomb united this species with his ZL. zz¢zda. 
Has. Oahu, Mokuleia, Kamoo, Waialua (Gulick). 
(22) Leptachatina emerita, sp. nov. 
Testa elongata, subcylindrica, imperforata, dextrorsa, cornea vel hyalina vel 
flava, tenuiuscula, sub lente longitudinaliter tenuiter striata, apice obtusulo; anfr. 63, 
plano-convexi, ultimus % altitudinis testae fere aequans; sutura impressa, marginata ; 
apertura ovata, margine dextro sub-incrassatulo, columellari sub-reflexo, plica parva 
inconspicua ascendente munito. Alt. 8; diam. 3°5 mill. 
Plate) X17 fie. 10: 
Variable in colour, shading from brown to a hyaline tint; adult specimens lose 
their gloss and become of a straw-yellow. The columellar plait is small and incon- 
spicuous. 
Has. Molokai, Kalamaula, and at 4000 feet (Perkins). 
(23) Leptachatina exilis Gulick. 
Achatinella exilis Gulick, Ann. Lyc. New York, vi. (1856), p. 188, pl. v1. fig. 16 
[bad]; Sykes, P. Malac. Soc. London, 1. pl. xiv. fig. 18. 
Leptachatina cylindrata Pease, J. Conchyl. xvi. (1869), p. 168; P. Zool. Soc. 
London, 1869, p. 650 (nom. sol.). 
Remarkable though the distribution may be, I am unable, after a comparison of 
Gulick’s type with specimens of Z. cylindrata presented by Pease to the British 
Museum, to sever these two species. 
Has. Oahu, Keawaawa (Gulick).— Kauai (Pease) ; at 4000 feet (Perkins). 
47—2 
