PARTULA, HUAHEINE. 249 



more compactly ovate, very solid, the lip very little ex- 

 panded and very much thickened on the convex face, though 

 less broad than in auriculata, and with less prominent in- 

 ternal callosities, hence the aperture is more open. The 

 parietal tooth is smaller than in auriculata, and often almost 

 disappears. The lip is generally brown-edged, and often a 

 raised callus connects the ends. The columellar lip is seen, 

 in profile view, to be very thick, and the umbilical crevice 

 is narrow. Color-patterns as follows: 



a. Last li/2 or 2 whorls corneous, copiously streaked ob- 

 liquely with chestnut; the next earlier whorl rich chest- 

 nut, deepening to purple-black towards and at the sum- 

 mit. This is the typical coloration. 



6. Yellowish, with some faint brownish streaks, apex pale. 

 Approaches auriculata in form. 



c. Dark chestnut throughout, with more or less distinct 

 paler oblique streaks on the last whorl. 



d. Chestnut colored with a broad corneous or yellowish 

 zone above the middle of the last whorl. This pattern 

 also occurs in auriculata. 



Length 19.5, diam. 11.5, aperture 11 mm. (fig. 14). 



Length 17.5, diam. 11, aperture 10 mm. 



P. robusta has not before been figured, but descriptive 

 notes were published by Smith in his catalogue of the Hart- 

 man collection. Types no. 59444 A. N. S. P. 



4. Species of Huaheine. 



Huaheine possesses four species all endemic. Two (P. 

 arguta and annectens) are restricted to two valleys, and the 

 latter, like P. clara, appears to be gradually becoming extinct. 

 Both species are remarkably uniform in all their specific 

 characters, and are related to forms of Tahiti and Baiatea. 

 On the contrary, the other two species (P. rosea and varia) 

 have spread nearly all over the island, and are subject to 

 considerable variation. Neither is closely related to other 

 Society Island species, but a form scarcely distinguishable 

 from varia occurs at Rarotonga. It is worthy of remark that 



