PARTULA, TONGA ISLANDS. 273 



mellar margin two-thirds of the distance to the insertion, 

 terminating rather abruptly near the lower end of the oblique, 

 straight columellar fold. 



The habitat of this species is not known, even the group 

 assigned (Sainoan) being uncertain. 



V. SPECIES OF THE FIJI Is., ROTUMA, AND THE TONGA Is. 



Tonga Is. species. 

 61. P. SUBGONOCHILA Mousson. PL 41, figs. 11, 12. 



Shell perforate, ovate-conic, finely, widely decussate, stria- 

 tulate, greenish. Spire convexly-conic, regular, the summit 

 rather obtuse ; suture not impressed, submarginate. Whorls 

 4%, slightly convex, the last moderately convex, not as long 

 as the spire, not ascending in front. Aperture rather small, 

 sub vertical (making an angle of 5 degrees with the axis), 

 oblong, obliquely truncate above. Peristome expanded, 'angu- 

 larly reflexed, whitish, somewhat labiate within, the margins 

 not approaching ; right margin curved in a long arch above ; 

 columellar margin vertical, wide, spreading, not folded with- 

 in. Length 16, diam. 9.6 mm. (Mouss.) . 



Tonga Is. : Futuna or Fotuna, in the Home group, and 

 Vavau (Dr. Ed. Graeffe). 



Partula subgonochila Mouss., Journ. de Conchyl. xix, 1871, 

 p. 14, pi. 3, f. 4. 



This species resembles P. varia to some extent, but the spire 

 is less produced. Two lots from the Bartman collection are 

 before me: No. 4284 Carnegie Mus. is from "Fortuna, 

 Friendly Is.," coll. by Brazier (apparently Futuna, the type 

 locality). The shell is thin, pale greenish yellow on the last 

 whorl or two, fading to whitish above near the suture, the 

 spire whitish. The spiral strias are rather close and very dis- 

 tinct, and on the last whorl the peripheral 'angle is so in- 

 distinctly indicated, that the contour remains rounded. The 

 summit is quite obtuse. The lip is white. The largest of 

 four measures, length 17, diam. 10, aperture 9 mm., whorls 

 4%. The smallest is 16 mm. long. 



