26 PARTULINA, MOLOKAI. 



lines and bands. Under a glass the spiral striation is dense 

 and deeply cut, the striae rippled and descending. The axis is 

 either closed or slightly open. Lip slightly expanded and well 

 thickened within. The colnmella is reflexed in a short, wide 

 triangle, and the columellar fold varies from distinct to weak. 



Length 25 to 26, diam. 15.2, length aperture 14 mm. 



Length 22.5, diam. 15, length aperture 13 mm. 



Length 23, diam. 14, length aperture, 11.6 mm. 



Length 21, diam. 12.3, length aperture 10.5 mm. 



Molokai, in the eastern part, Ualapue, Kaluaaha, Mapulehn, 

 Waialua, Halawa and Pelekunu (Meyer). 



Partula virgulata MIGHELS, Proc. Boston Soc. of Nat. History, 

 II, 1845, p. 20. PFR., Monogr., iii, p. 454. Achatinella virgu- 

 lata High., REEVE, Conch. Icon., pi. 1, figs. 3, 4, 5, 5b. NEW- 

 COMB, P. Z. S., London, 1854, p. 311; Lye. N. H. of N. Y., vi, 

 1858, p. 312 (description of animal). THWING, Reprints Orig. 

 Descript. Achat., pi. 2, f. 8. Partulina virgulata Migh., BOR- 

 CHERDING, Zoologica, xix, Heft. 48, p. 50, pi. 1, figs. 1-20. 

 Achatinella rohri PFR., P. Z. S., 1846, p. 38. Bulimus rohri 

 PFR., Zeitschrift fur Malak., 1846, p. 115; Monographia, ii, p. 

 74. Bulimus insignis Mighels on labels, REEVE, Conch. Icon., 

 Achatinella, species no. 3. Achatinella virgulata var. halawaensis 

 Baldwin in coll., BORCHERDING, Zoologica, xix, p. 52, pi. 1, f. 

 13-16, 1906. 



This species is well distinguished by the broad band above 

 the suture on the embryonic whorls, usually purple-brown but 

 sometimes yellowish and quite pale, and the total absence of 

 flame markings. It is indifferently dextral or sinistral. 



The typical form (pi. 6, figs. 1, 3), such as occurs at Mapu- 

 lehu, while varied a good deal, is rarely so dark as the forms 

 from the neighboring valley Kaluaaha, in which the light ground 

 is often reduced to narrow lines; or in Ualupue, the next valley 

 westward, the light ground is altogether extinguished (figs. 5, 6). 

 These dark shells are very glossy, with much fainter spiral striae 

 than the typical form, which has little or no gloss. Fig. 9 rep- 

 resents a form from Ualupue, fig. 10 from Pelekunu, after Bor- 

 cherding. Uniform purplish-flesh tinted examples, without 

 bands on the post-embryonic whorls, perhaps occur in all the 



