20 PARTULINA, SECTION PERDICELLA. 



4. P. MAUIENSIS (Pfeiffer). PL 4, figs. 11, 12, 13, 14. 



Shell subperf orate, ovate-oblong, rather thin, longitudinally, 

 irregularly striate, decussated with very close spiral striae visible 

 under a lens, hardly shining; whitish, variegated with serrated 

 brownish-corneous streaks. Spire regularly conic, apex obtuse, 

 suture shallow, slightly margined. Whorls 5J, rather flat, the 

 last nearly two-fifths the total length, somewhat tapering at the 

 base. Aperture little oblique, oblong. Columellar fold obso- 

 lete. Peristome simple, unexpanded, brown-bordered, the 

 columellar margin reflexed, subadnate. Length 13. diam. 6, 

 aperture 6x3 mm. (Pfr.). 



West Maui (Newcomb); Makawao to Huelo (Baldwin). 



Achatinella maniensis Newc. [typogr. err. for mauiensis] 

 PFEIFFER, P. Z. S., 1855, p. 207 (1856). A. mauiensis Newc., 

 PFR. , Monographia, iv, p. 563. NEWCOMB, Amer. Jonrn. of 

 Conch., ii, 1866, p. 217, pi. 13, fig. 16. THWING, Reprint 

 Orig. Descript. Achat. , p. 134, pi. 3, f. 6. 



The shape and coloration are about the same as in P. zebrina 

 Pfr. , but the aperture is dark brown within (sometimes over- 

 laid with whitish), and the brown columella has only a low 

 fold situated high, and not heavily calloused, much as in some 

 Bulimuli. The whorls of the spire are sometimes distinctly 

 margined below the suture. Figured from shells received from 

 Baldwin. Length 12.2, diam. 6.2, aperture 6 mm.; 5 J whorls. 



5. P. ZEBRINA (Pfeiffer). PI. 5, figs. 5, 8 to 12. 



Shell imperforate, dextral, rather thin, smooth, very minutely 

 decussate under a lens; glossy; whitish, very elegantly marked 

 with blackish-chestnut zigzag streaks. Spire somewhat turrited, 

 apex obtuse, brown; suture with a thread-like margin. Whorls 

 5, moderately convex, the last nearly three-sevenths the length. 

 Aperture slightly oblique, truncate-oblong, lilac within; colu- 

 mellar fold above, twisted, callus, slightly prominent. Peri- 

 stome simple, unexpanded, brown-bordered. Length 12J, 

 diam. 6, aperture 6x3 mm. Sandwich Is., Frick in Cuming 

 coll. (Pfr.). 



East Maui: Honomanu (Baldwin). 



