30 PARTULINA, MOLOKAI. 



Molokai (Newcomb) : Kalae, Kaweeku, Kalamaula, Kahanui 

 and Makakupaia (Meyer), in the central part of the island. 



Achatinella rufa NEWC., Ann. Lye. N. H. of N. Y. vi, p. 21, 

 May 1853; P. Z. S. 1853, p. 130, pi. 22, fig. 3; Ann. Lye. vi, 

 p. 324 (description of animal). PFR. , Monographia iv, 537. 

 SYKES, Fauna Hawaiiensis p. 318. Partulina rufa Nc., 

 BORCHERDING, Zoologica xix, p. 54, pi. 3, f. 1-9. Partulina 

 ida BORCHERDING, Nachrbl. d. d. Malak. Ges. 1901, p. 52; 

 Zoologica p. 56. 



(1) Typical P. rufa (pi. 7, fig. 3) is a dull shell with the 

 growth-lines usually strongly marked, unequal, crossed by low, 

 usually wide and more or less granulose spirals mingled with 

 finer waved striaB, the latter often predominating, especially be- 

 low the periphery. The sculpture is extremely variable, the 

 granulose spirals being very strong in some forms, such as that 

 described as idse, and in others much reduced, the finer decur- 

 rent striation then dominating. The summit is yellowish- 

 brown; last 1^ or 1 embryonic whorls are marked with pro tractive 

 yellowish-brown and white stripes; following neanic whorls have 

 a dense, confused zigzag pattern, often indistinct or illegible. 

 This may continue on the upper half of the last whorl, or it 

 may be replaced by a uniform or clouded tawny color, inter- 

 rupted by a white or yellowish belt just below the periphery. 

 The columellar fold is strong, calloused, brown tinted, the lip 

 of similar tint ; interior pink or dull brownish-violaceous. 

 Length 24, diam. 13.5, aperture 11.7 mm. 



The original locality on Molokai is uncertain. Borcherding 

 figures various forms from localities in the mountains south of 

 the northern peninsula, none of them just like the typical form, 

 represented by specimens before me received from Newcomb. 

 Borcherding tentatively suggests the view that P. rufa is "not 

 a pure species, but a bastard-form between P. tessellata Newc. 

 on the one side, and P. proxima Pse. on the other." While 

 this seems rather doubtful, and probably could be proved only 

 by breeding experiments, rufa certainly unites characters of the 

 two species. The embryo has protractive stripes as in P. 

 proxima. Some very rare color-forms closely resemble proxima 

 in the later stages; but it differs from that species by the dull 



