90 LEPTACHATINA, S.-G. ILIKALA. 



colored. Long. 6/20, diam. 3V 2 /20 poll." (7.5x4.4 mm.) 

 (Neivc.) Length. .35, diam. 0.2 inch (Neiuc.) 



Oahu: Manoa (Newcomb, Cooke); Palolo, Mt. Tantalus, 

 Pauoa, Konahuanui and Nuuanu (Cooke). 



Achatinella fusca NEWCCMB, Ann. Lye. N. Y., vi, 1853, p. 

 28; P. Z. S. 1853 (1854), p. 145, pi. 23, fig. ^.Achatinella 

 (Laminella) fusca PFEIFFER, Mon. Hel. Viv., iv, p. 558; vi, 

 p. 181 ; viii, p. 244. Leptachatina fusca PEASE, P. Z. S. Lon- 

 don, 1869, p. 651. 



This is one of the most aberrant species of the genus. 

 The first whorl is slightly depressed, with a deep broad suture 

 separating it from the second whorl which is rather convex 

 and somewhat shouldered above. Both the first and second 

 whorls are sculptured with rather strong longitudinal strise 

 and very fine spiral strife. The latter are clearly visible 

 under a strong lens, especially in young specimens. This is, 

 also, one of the subgeneric characters of Thaanumia. The 

 adult shells of fusca are always imperforate and the lower 

 whorl is more draw r n out and tapering. In young specimens 

 of 5 or less whorls there is a minute perforation. 



There are four distinct color varieties of the typical form 

 of this species : the first and most abundant, which is also the 

 one described by Newcomb, has a dark reddish brown band 

 (which sometimes extends to the suture) above the periphery, 

 the spire is reddish brown, there is usually a yellowish corn- 

 eous band accompanying the suture and the base below the 

 periphery is yellowish corneous (figs. 65, 66). The second 

 is of a uniform dark reddish brown ; the third is light brown- 

 ish corneous, slightly lighter in color below the periphery 

 (fig. 67). The fourth has the first 3y 2 whorls of a dark 

 reddish brown, the two last are yellowish corneous, with a 

 narrow reddish brown band accompanying the suture (fig. 

 69). The last two varieties are very rare as I have seen 

 only two specimens of the third variety, which came from 

 Nuuanu, and a single specimen of the fourth variety was 

 collected in Palolo. 



Adult shells vary between the following measurements: 



Length 8.1, diam. 4.2, length of apert. 3.9 mm.; whorls 

 ; Nuuanu. 



