ACHATINELLA TURGIDA. 297 



Yet other shells of the lot have the color of the apex and the~ 

 shape of the shell exactly as in A. turgida ovum. As the col- 

 ony is well within the turgida country, and some distance 

 from the area occupied by swiftii, it seems more natural to 

 rank the form under turgida. 



When in Honolulu I noted that a copiously mottled form 

 also occurs in Waimaiio, no. 3609 and 2050 Spalding coll. In 

 the latter lot there are 42 dextral, 32 sinistral shells. I have 

 not these Waimano valley shells by me, but it may be that 

 they are another pattern of A. t. perplexa. Dr. Cooke's no. 

 1176, which I have figured, pi. 56, fig. 11, is probably a melan- 

 istic form of perplexa. 



346. A. TURGIDA OVUM Pfeiffer. PL 56, figs. 6 to 12; pi. 59, 

 fig. 17. 



"Shell imperf orate, sinistral, globose-conic, solid, rugulose- 

 striate, a little shining, whitish ; spire a little concavely conic, 

 apex acute; suture deeply margined; whorls 5%, the upper 

 flat, following convex, the last inflated, slightly shorter than 

 the spire; columellar fold thick, tuberculiform, pale lilac. 

 Aperture diagonal, sinuate-semicircular; peristome unex- 

 panded, bordered with black-brown, with a crenulate lip 

 within. Length 19.5, diam. 13 mm. ; aperture 10.5 mm. long, 

 6 wide. Mus. Cuming. Habitat in the island of Oahu, very 

 rare, Newcomb" (Pfr.). 



Moanalua to the Waiau- Waimano ridge. 



Achatinella ovum PFR., P. Z. S., 1856, p. 334 ; Monographia, 

 iv, 541. ? THWING, Orig. Descript., etc., p. 19 ("Nuuanu")- 



The original description of A. ovum applies to white ex- 

 amples such as I note below from Halawa, etc. It is a rare 

 white form of a race which is usually some tint of yel- 

 low, and generally encircled with chestnut bands. There is a 

 black or nearly black streak behind the outer lip, and the 

 peristome is 'blackish brown. A blackish-brown or chestnut 

 band often borders the suture. Mr. E. A. Smith, who ex- 

 amined the type-specimen for me, writes that ' t the lip is black- 

 ish-brown within and without, thickened within, the thicken- 

 ing being slightly crenate, but this crenulation I consider in- 



