BULIMULUS-NAESIOTUS. 99 



B. ACHATELLINUS (Forbes). PL 16, figs. 26-31. 



Shell perforated, ovate-pyramidal with long, conic spire, rather 

 thin ; variously colored, being banded with chestnut on an olivace- 

 ous or whitish ground, or chestnut below, white above, always with 

 a white line below the suture ; surface smooth and glossy, like an 

 Achatinella with slight growth-wrinkles and an impressed band be- 

 low the suture, pinched up into tubercles at irregular intervals. 

 Whorls 7 J, slightly convex. 



Aperture small, about one-third the length of the shell, banded 

 within ; outer lip unexpanded, columellar lip triangularly, flatly 

 dilated above ; columella subvertical. 



Alt. 17, diam. 8$ ; alt. of aperture 6 mill, (specimen). 



Alt. 22, diam. 11 ; alt. of aperture 8* mill. (Pfr.). 



Upper levels of Chatham Island on trees and bushes (Kellett, 

 Wolf and Baur) ; Hood Island (Habel, fide Wimmer). 



Bulimus achatellinus FBS., P. Z. S., 1850. p. 56, pi. 9, figs. 5 a-b. 

 Bulimus achatinellinus PFR., Mon. Hel. Viv, III, p. 429, 1853 ; in 

 Cheinn. Conch. Cab., ed. ii, Bulimus, p. 93, pi. 31, figs. 19, 20; 

 Monogr. IV, p. 492, 1859. Bulimus (Rhaphiellus) achatinellinus 

 PFR., in Malak. Blatt., II, p. 160, 1855. Bulimulus (Omphalostyld) 

 achatinellus H. & A. Ads., Gen. Kec. Moll. II, p. 161, 1855. WIM- 

 MER, Sitz. Akad. Wiss. Wien., Ixxx, p. 43, 1879. Buliminus (Rha- 

 phiellus} achatinellinus MARTENS, in Albers, Heliceen, ed. ii, p. 238, 

 1860. REIBISCH, Isis, 1892, p. 15, t. ii, fig. 8. Bulimina (Rhaphiel- 

 lus) achatinellina PFR., Norn. Hel., Viv, p. 300, 1881. Bulimulus 

 (Rhaphiellus) achatinellinus STEARNS, Proc. U. S. Nat. Mus., XVI, 

 p. 428, 1893. Bulimulus (Ncesiotus) achatellinus Forbes, DALL, 

 Proc. Acad. Nat. Sci. Phila., 1896, p. 428, pi. 17, f. 13 (jaw). 



The gloss and coloring of this species are quite Achatinella-like. 

 Dall remarks : 



"The jaw is like the jaw of B. mix, with about 18 irregular, flat, 

 plate-like ribs, whose blunt ends denticulate the margin, especially 

 the cutting edge. The outer margin of these plates is a little raised 

 and thickened, the color is pale amber, darker where thickest. The 

 radula was rather broad, the single teeth did not differ in outline 

 from those of B. mix more than those of one specimen of mix differs 

 from those of another. The number of laterals is 14, of marginals 

 23, the formula 23'14-M4'23. 



" It will be observed from these facts that nothing in the dentition 

 of B. achatellinus justifies the presumption that it deserves a section 



