66 PARTULINA, OAHU. 



gamboge tint. There is often a pale line on the periphery. 

 Embryo pale brown, the last half whorl striped with brown. 

 The lip is thickened within, white or flesh-tinted. Columellar 

 fold often very strong and more or less tinted with brown, 

 but white at the end. Figured from cotypes. Probably a 

 variety of A. terebra lignaria, yet I have seen no actually in- 

 tergrading specimens. It seems well characterized by the 

 color and short contour. 



In a series from Honokowai, West Maui, sent bv Mr. Thaa- 



/ 



num, the color of the last whorl varies from pale buff to dull 

 gamboge, being darkest on the base. The spire is generally 

 more drawn out than in the figures on plate 13, and is a little 

 attenuated, its outlines distinctly concave or sometimes almost 

 straight. The flames on the last embryonic whorl are occa- 

 sionally lost by wear. 



SPECIES OP OAHU. 

 36. P. MONTAGUI Pilsbry. PI. 24, figs. 7, 8. 



The shell is sinistral, perforate, thick and solid, ovate-conic, 

 the spire acuminate, its outlines straight or somewhat con- 

 cave above. Embryonic whorls distinctly striate spirally; 

 last three whorls rudely sculptured with close, irregular 

 wrinkles, and on the last whorl there are spirally and ob- 

 liquely descending ridges producing flattened facets (as in 

 many large Lymnaeas). The minute spirals disappear on 

 the later whorls. The upper whorls are nearly flat, the last 

 three slightly convex, last whorl more convex, the base rather 

 rotund. Suture superficial, sometimes having a margin de- 

 fined by an impressed line on the last whorl, but in other ex- 

 amples this is wanting. Aperture slightly oblique. Outer 

 and basal margins of the peristome are expanded, thick, and 

 have a heavy callous thickening within ; columellar margin 

 raised, thick; columellar fold thick and moderately project- 



ing. 



(a) Length 25, diam. 14, length aperture 12 mm.; l 

 whorls. 



(b) Length 24.7, diam. 12.5, length aperture 11 mm.; 

 whorls. 



