SOUTH AMERICAN OPEAS. 205 



Stenogyra (Opeas) alabastrina SHUTTL., Diagnosen no. 6, 

 p. 139, from Mittheil. naturf orsch. Ges. in Bern, 1854, p. 47. 

 Bulimus a., PFR., Monogr. iv, 460. 



This very slender species has not been figured, and like 

 the next, is known by the original description only. 



8. 0. GOMPHARIUM ( Shuttle worth ). 



Shell very narrowly perforate, conic-turrite, remotely and 

 irregularly plicatulate, slightly shining, wax colored. Spire 

 rather acute, the apex obtuse. Whorls 6, a little convex, the 

 last two-sevenths the total length; suture moderate. Colu- 

 mella straight. Aperture semioval; peristome with the right 

 margin slightly sinuous, columellar margin very narrowly re- 

 flexed, nearly closing the perforation. Length 6.5, diam. 2.5, 

 aperture 1.75 x 1 mm. (Shuttl.). 



Porto E/ico: San Juan, 3 specimens (Blauner). 



Stenogyra (Opeas) gompharium SHUTTL., Diagnosen neuer 

 Moll. no. 6, p. 139, in Mittheil. etc., 1854, p. 47. Bulimus g., 

 PFR., Monogr. iv, p. 461. 



SOUTH AMERICAN SPECIES. 



Besides species 1 to 4 and 9 to 14, the 0. guatemalense of 

 Strebel (no. 20) has been reported 'from Colombia and 

 Ecuador. 



9. 0. MARTENSI ( Strobe!) . PI. 29, fig. 86. 



Shell subperf orate, turrite, thin, hyaline, glossy; greenish 

 buff- white ; spire regularly tapering, the apex obtuse, suture 

 deep. Whorls 7 to 8, a little convex, the first smooth, the 

 rest very delicately striate, the last whorl scarcely one-third 

 -the total length, rounded basally. Aperture subrhombic-oval, 

 not oblique; peristome simple, the margins joined by a very 

 thin callus; columellar margin narrowly reflexed, basal mar- 

 gin somewhat rounded ; columella straight, somewhat twisted 

 in young specimens. Length maximum 20, minimum 9 mm. 

 (Strolel). 



Argentina : Palermo in the environs of Buenos Ayres, rare 

 (Strobel). 



Stenogyra martensi STROBEL,, Materiali per una Malacos- 



