LEPTACHATINA, S.-G. THAANUMIA. 85 



striated; apex subacute; spire convexly conical; suture sim- 

 ple, lightly impressed ; whorls 6, somewhat convex ; columella 

 a little oblique, white and plicately truncated ; aperture trun- 

 cately oval ; peristome simple with dextral margin unreflected, 

 acute, arcuate; columellar margin dilated, thin, white. 

 Length 8.3, diam. 4.3, length of body whorl 5.3 mm." 

 (Gulick.) 



Oahu: Mokuleia (Gulick) ; Palolo (Gulick, vid. label in 

 Bost. Soc.) ; Waianae Mts., back of Waialua (Lyman) ; 

 Waianae Mts., back of Leilehua (Cooke). 



Achatinella fuscula GULICK, Ann. Lye. N. Y., vi, 1856, p. 

 180, pi. 6, fig. 8. Achatinella (Leptachatina) fuscula 

 PFEIFFER, Mon. Hel. Viv., vi, p. 183; viii, p. 245. Lepta- 

 ckatina fuscula PSE., P. Z. S. London, 1869, p. 651. SYKES, 

 Fauna Haw., ii, 1900, p. 362. 



This species appears to be represented by a single shell, in 

 the collection of the Boston Society of Natural History. 

 Unfortunately the specimen was dead when collected. The 

 shells collected by Mr. Lyman and myself agree very closely 

 with the type, except that a few are minutely perforate and 

 all are slightly larger. The type specimen has Palolo as its 

 habitat. I am sure that this must be a mistake, as all the 

 species that are in any way related to it are from the other 

 end of Oahu. Gulick gave the length of the body whorl as 

 4.3 mm., but if we reduce his measurement in inches to 

 millimeters it should be 5.3 mm. 



L. fuscula is provisionally located in the subgenus Thaa- 

 numia. A few of the specimens collected by Mr. Lyman and 

 myself are minutely perforate, and a number show the faint 

 spiral striae on the embryonic whorls, which are less flattened 

 and have a shallower suture than most of the species included 

 in this subgenus. The costse are also less prominent. 



In fresh dark-colored specimens the columella and lip, es- 

 pecially the former, are a purplish brown. There is also 

 a lighter colored, almost corneous, variety. 



110. L. DULCIS n. sp. PI. 13, figs. 8, 10. 



The shell is perforate, ovately conic, light brown, with a 



