272 PARTULA, SAMOAN ISLANDS. 



copra, and the shells "brought from various places might 

 easily become mixed. 



Group of P. gonochila. 



The relations of P. gonochila and P. subgonochila to- 

 other Partulae are uncertain. 



60. P. GONOCHILA (Pfeiffer). PL 41, figs. 6, 7, 8, 10. 



Shell subperforate, ovate-conic, thin, delicately and closely 

 decussate, diaphanous, green. Spire conic, rather acute; 

 \\horls 5, slightly convex, the last convex, longer than the 

 spire. Columella obsoletely plicate above. Aperture oblong, 

 obliquely truncate above; peristome broadly, angularly ex- 

 panded, a little reflexed, thin, white inside, the margins re- 

 mote. Length 17, diam. 9, aperture with peristome 10 x 7 

 mm. (Pfr.). 



Habitat unknown (coll. Dunker). Navigator (Samoa) Is. 

 (Pfr. ; coll. A'cad. Phila.). 



Bulimus gonochilus PFR., Zeitschr. f. Malak. 1847, p. 82; 

 Monogr. ii, 69. Partula gonochila PFR., Monogr. iii, 448; 

 iv, 512; vi, 160; Conchyl. Cab. p. 274, pi. 64, f. 33, 34. 

 ? Partula gonocheila REEVE, Conch. Icon. 6, pi. 4, f. 19 

 (May, 1850). 



Pfeiffer 's description and figures (pi. 41, figs. 7, 8) are 

 copied. The specimen drawn in figs. 6, 10, is slightly less 

 swollen than Pfeiffer 's, measuring, length 18, diam. 10.3, 

 aperture 10 x 7 mm., whorls 5. The last whorl is whitish 

 under a very thin pale greenish yellow cuticle. The 

 spire is red-brown, darkest at the apex; on the penul- 

 timate whorl it becomes paler in the middle, a darker shade 

 continuing as a border above and below the suture as far as 

 the lip. The growth-striae are fine and distinct. Engraved 

 spiral lines are fine and close, strongest on the last whorL 

 The whorls including the last are evenly convex; base con- 

 vex, shortly rimate and deeply perforate. The lip is re- 

 flexed, opaque white behind the reflection. It is strengthened 

 by a very strong, narrow white callous rib within. This rib 

 diminishes gradually above, and extends upward on the coin- 



