PARTULINA, HAWAII AND MAUI. Ill 



tral tooth is present ; and the formula of dentition is 

 125-1-125 X 120 = 30,120. ' ' (Baldwin) . 



48a-. P. physa errans, n. var. PL 17, figs. 14, 15, 16. 



The shell is thin, sinistral, more slender than usual in P. 

 physa (haiuaiiensis) , minutely perforate or almost imperf or- 

 ate, smooth and slightly shining, under a lens minutely 

 marked with growth-lines and closely, distinctly striate spir- 

 ally throughout, the striae rippled. Embryonic shell marked 

 with broad axial brown stripes as in P. physa ; neanic whorls 

 marked with brown zigzag stripes on a white or cream 

 ground ; on the last whorl the stripes are usually interrupted 

 by a light band below the periphery, and are irregular on the 

 base. Sometimes the brown markings are very faint. The 

 whorls are rather strongly convex. Aperture varying from 

 purplish-brown to faint pink within ; lip thin, very narrowly 

 expanded, white-edged within. Columella reflexed as in P. 

 physa. 



Length 18, diam. 10.8, aperture 9.2 mm. ; whorls 6. 



Length 18, diam. 11, aperture 9.8 mm. 



Length 16, diam. 9, aperture 8 mm. 



Near Pahoa, Puna, type loc., fig. 14, and Kaiwiki in the 

 district of South Hilo, figs. 15, 16 (Thaanum). 



This very beautiful form was thought by the late Mr. Bald- 

 win to be distinct from his A. haivaiiensis, but Mr. Thaanum 

 agrees with us that it may more justly be ranked as a sub- 

 species. It is separated by innumerable gulches and water 

 courses from the range of P. pliysa, some forty to sixty miles 

 distant, but the intervening territory has not yet been fully 

 searched ; still there can be no doubt that the range of errans 

 is discontinuous with that of physa. In Puna it has reached 

 the extreme southeastern range of Achatinellidce. 



In Olaa Mr. Thaanum found P. p. errans in ieie heads, 



49. P. GRISEA (Newcomb). PI. 18, figs. 8, 9. 



" Shell sinistral, inflated below, pointed at the summit; 

 whorls 6, rounded, not margined. Aperture ovate ; columella 

 short, flat and but slightly twisted; lip expanded, thickened 



