88 HELIX. 



H. TROCHALIA Benson. PI. 18, figs. 67, 58. 



Shell umbilicate, depressed, acutely carinated at the periphery, 

 low conical above, convex below ; chestnut brown, becoming lighter 

 toward the apex ; lightly, obliquely striated. Whorls 5, the last 

 descending to the oblique, transversely oval aperture; lip expanded, 

 reflexed, pinkish-white, its ends approaching, the columellar termina- 

 tion half-concealing the umbilicus. 



The convexity is about equal above and below the pinched-out 

 keel ; the earlier whorls are convex, the latter two flattened, the last 

 whorl being excavated just above and below the keel, and rather 

 abruptly deflexed in front. 



Alt. 14, greater diam. 23, lesser 19 mill. ; width of umbilicus 2 

 mill.; orjlique alt. of aperture 11, width 15 mill., measurements in- 

 cluding peristome. 



Port Blair, Andaman Is. 



H. trochalia BENS., Ann. Mag. N. H. 3d. Ser., vii, p. 82, Feb., 

 1861. PFR., Monogr. v, p. 329. HANL. & THEOB., Conch. Indica, 

 t. 38, f. 7. STOLICZKA, Proc. Asiat. Soc. Beng., March, 1870, p. 87. 

 TRYON, Amer. Journ. Conch, vi, p. 287. Ampelita (Helix) 

 Bigsbyi TRYON, Amer. Journ. Conch, v, p. 110, t. 10, f. 3. 



A peculiar shell, of doubtful affinities, but apparently more nearly 

 related to the Indo-malayan species with which I above associate it, 

 than to Obba or Obbina. 



Unfigured, undetermined species. 



H. TRITONIENSIS Le Guillou. Shell trochoidal, sub-umbilicate, 

 whitish-tawny, substriate ; whorls 5-6, a little convex, the last 

 rounded, convex beneath ; spire conic-depressed; aperture narrow; 

 lip sub-reflexed ; umbilicus small, punctiform. 



Alt. 7i, diam. 9 mill. (Oaill. in Revue Zool. 1842, p. 138.) 



Triton Bay, New' Guinea. 



H. HYALINA Le Guillou. Shell trochoidal, carinated, scarcely um- 

 bilicated, hyaline, subvitreus. Whorls 6, subconvex, the base de- 

 pressed ; delicately striated, the last having an acute carina a little 

 reflexed upward, convex-depressed beneath ; aperture sub lanceolate, 

 acute, anteriorly, base rounded, subreflexed, obliquely straightened 

 toward the umbilicus. Alt. 10, diam. 15 mill. (Guill.) 



Solomon Islands. 



