84 PARTULINA, LANAI. 



f. 70 (1854) ; Ann. Lye., vi, p. 333. PFR., Monogr., iv, 256* 

 vi, 169. SYKES, Fauna Hawaiiensis, p. 319. THWING, Re- 

 print Orig. Descript. Achat., pi. 2, f. 11. Achatinella fulva 

 Newoomb, PFR., P. Z. S., 1855, p. 208 (1856). Achatinella. 

 lactea GULICK, Ann. Lye. vi, p. 198, 1856. 



Dr. Newcomb included several color-forms in his original 

 description, but the dextral shell with several blackish- chest- 

 nut bands and an umbilical patch, depicted in his figure, may 

 be taken as the typical form. It is copied in my pi. 21, fig. 

 14. In the lot given by him to the Academy there are two- 

 dextral and nine sinistral shells, three having a dark um- 

 bilical patch, the others white there. Fully adult shells are 

 rather pot-bellied, the base being notably convex (especially 

 as viewed dorsally), but in some shells with thickened lip 

 the juvenile character of an acute peripheral angle is re- 

 tained for a short distance in front of the aperture. Three of 

 the Neweomb lot are figured, pi. 22, figs. 1, 2, 3, to show the 

 variation of shape and pattern. 



A lot of 48 shells, from Gulick, all sinistral, shows substan- 

 tially the same forms and banding (pi. 22, figs. 4 to 9). The 

 bands are either deep chocolate or ochraceous, and vary from 

 rather wide to linear. As in the Neweomb set, some shells 

 are quite narrow, the dimensions being about as follows : 



Length 18, diam. 10 mm., average specimen. 



Length 15, diam. 10 mm., rare broad form. 



Length 15.3, diam. 8.5 mm., narrow form. 



Four in the lot are brownish-tawny with extremely weak 

 bands or none; the rest are banded with chocolate and with 

 ochraceous in about equal numbers. 



Another lot from " Large Valley, Lanai," Gulick, contains 

 11 shells all dextral, color white, with ochraceous or dark 

 chestnut bands. A lot of 7 from Mr. D. Thaanum is also en- 

 tirely dextral, beautifully polished and chocolate-banded. 



Another lot of 58 shells from Mr. Thaanum is polymorphic, 

 (a) Three-banded with dark chestnut or ochraceous, the um- 

 bilical region always white, sometimes with a few accessory 

 lines, 25 specimens, all sinistral, fig. 10. (&) bands reduced 

 to lines or split, the upper one often wanting, 10 specimens, 



