70 PARTULINA, MAUI. 



colored 'band encircling each whorl, the last whorl having 

 two. Length 12, diam. six-twentieths of an inch ' (Newc.). 



East Maui (Neivcomb) : Huelo, Makawao to Nahiku 

 (Thiving) ; Nahiku (Baldwin). 



Achatinella porcellana NEWC., P. Z. S., 1853, p. 146, pi. 23, 

 f. 47. PFR., Monogr. iv, 525. THWING, Orig. Descriptions, 

 p. 105, pi. 2, f. 12. 



In a specimen from Newcomb the first whorl is white, a 

 yellow band beginning on the second below the suture; but 

 in others seen the apex is brown or blackish, a band of the 

 same color \y 2 whorls long running from it above the suture, 

 fading into white at its upper edge, the first \ l /2 whorls being 

 therefore bicolored. Then a yellow band appears faintly 

 below the middle of the whorl, finally becoming the supra- 

 peripheral band on the last whorl. In some specimens a 

 band bordering the suture below also is found. The last 

 whorl has two to four bands: (1) the subsutural, often want- 

 ing; (2) one above the periphery; (3) one below it, entering 

 the aperture at its upper angle, and sometimes there is (4) a 

 narrow crescent around the columella. Occasionally a few 

 spiral lines are developd in addition to these bands. These 

 bands and lines vary from ochraceous to dark brown (mummy 

 brown of Ridgway). The ground color is white, with a yellow 

 tint around the columella or over the whole base. Surface 

 glossy, with only very weak spiral striation. The lip is nar- 

 rowly thickened within in adult shells, its face tinted or 

 spotted at the bands. Columella white or brown. Specimens 

 from Nahiku (pi. 19, figs. 1-3) measure: 



Length 18, diam. 10 mm. ; 6 whorls. 



Length 18, diam. 10.5 mm. ; 5 l / 2 whorls. 



Length 15.5, diam. 9 mm. 



All the shells I have seen are dextral. A. flemingi and 

 wailuaensis are apparently varieties of porcellana, as Mr. 

 Thwing has intimated. Very likely A. fulvicans, possibly 

 A. nattii also, will eventually be included in porcellana. 



Fig. 4 is a copy of Newcomb 's figure of porcellana. 



