212 PARTULA, MOOREA. 



vex at base. The lip is narrowly reflexed, a little thickened 

 within. There is no noticeable callous nodule on the colu- 

 mella, and no parietal tooth. 



Other lots show a wide range of variation in form and color, 

 apparently showing considerable local differentiation. In one 

 lot from Garrett (pi. 29, figs. 1, 2, 3, 4, 5) there are several 

 color- forms: tawny shells with narrow browner streaks (fig. 

 5) ; greenish white (fig. 1) ; pale brown or whitish with 4 in- 

 terrupted bands (figs. 2-4). Another lot consists of yellow 

 or yellowish-corneous shells, very indistinctly streaked (fig. 

 11). Still other forms (figs. 9, 10) approach closely to typi- 

 cal P. t&niata in color, having two widely separated whitish 

 bands on a tawny-brown ground. 



21. P. ERHELII Morelet. PL 27, figs. 15, 16. 



Shell slightly umbilicate, acutely ovate, thin, diaphanous, 

 decussate under the lens, covered with a grayish-tawny, in 

 the last whorl yellow epidermis. Spire conic acute. Whorls 

 5, a little convex, the last longer than the spire, angular in 

 front. Aperture ample, very oblique, oval. Columella 

 lightly arcuate; peristome narrowly expanded, white-lipped, 

 margin acute, roseate, outwardly scarlet-tinted. Length 16, 

 diam. 8, length of aperture 9, width 5% mm. (Morelet). 



Society Is.: Moorea (Morelet). 



Partula erhelii MORELET, Journ. de Conchyl. iv, 1853, p. 

 371, pi. 12, f . 7, 8. PFR., Monogr. iv, 509 ; vi, 157. 



A thin little shell, writes M. Morelet, diaphanous, finely 

 striate in both directions, recognizable by the obliquity of the 

 aperture, the plane of which is inclined backward, as well as 

 by the angular shape of the last whorl. The peristome is di- 

 lated, reddish at the edge, thickened by a white callus which 

 is sharply limited towards the inside. The slightly eurved 

 columellar margin is applied over the umbilical region so as 

 to almost wholly mask the opening. 



Dr. Hartman referred this form to P. taniata, but the 

 features noticed in Morelet 's remarks, translated above, 

 hardly warrant such a disposition of it. The lip-color and 



