114 HELIX-EUHADRA. 



The umbilicus is wider in some specimens than in others, and the 

 angle above the periphery is variable and occasionally more pro- 

 nounced. In dead specimens the livid violaceous color of the 

 aperture is changed into white, and the obscure fuscous band at the 

 periphery is scarcely to be detected. (Bens.*) 



H. PILIDION Benson. PI. 31, fig. 20. 



Shell narrowly umbilicated, subglobose-conoid, very thin, smooth, 

 lightly striate, striae rather remote, elevated, corneous-brown, and 

 with very close decussating spiral ones; translucid, whitish orna- 

 mented with a single peripheral rufous band ; spire conoidal, apex 

 somewhat obtuse, suture lightly impressed. Whorls 4?, sensibly 

 widening, a little convex ; the last scarcely descending in front, 

 convex beneath ; aperture oblique, quadrate-lunate, peristome acute, 

 thin, expanded a little all around, margins remote, subconniving, 

 joined by a delicate callus, columella wider, triangularly expanded. 

 ^Bens.) Alt. 9, greater diam. 16, lesser 13 mill. 



Pegu. 



JET. pilidion BENS, in Ann. Mag. N. H. 3d ser., vi, p. 191, Sept., 

 I860. PFR. Mon. Hel. Viv. v, p. 347. HANLEY & THEOB., Conch. 

 Ind., t. 53, f. 6. 



A small species which I have not seen. It is perhaps allied to 

 H. hemiopta. 



H. PHAYREI Theobald. PI. 32, fig. 53. 



Shell moderately umbilicated, orbicular-conoid, somewhat solid, 

 with corneous epidermis, shining; obliquely flexuously, rudely 

 plicate-striate under the epidermis, the periphery obtusely angulated. 

 Spire depressed-conoid, apex obtuse, suture scarcely impressed; 

 whorls 6, a little convex, slowly increasing, the last descending and 

 rotund toward the aperture, convex beneath, compressed around 

 the open profound umbilicus. Aperture sub circular-lunate, diago- 

 nal ; peristome white, slightly expanded all around, the margins 

 approximating, joined by a callus. (Stanford.} 



Alt. 8, greater diam. 18, lesser 15? mill. 



Ava. 



H. phayrei THEOB. in. Journ. Asiat. Soc. Beng. 1859, p. 306. 

 BLANF. Contrib. to Ind. Malacol. v, p. 26, 1865. PFR. Monogr. v, 

 p. 346. HANLEY & THEOBALD, Conch. Indica., t. 15, f. 1 . 



