STREPTOSTYLA. 43 



Section SELASIELLA, Strebel, 1878. 



O. JOAQUIN^B, Strebel. PI. 9, fig. 33. 



Shell moderately solid, translucent, shining, yellowish, with 

 brownish }^ellow growth-lines, irregularly longitudinally plicate, 

 suture marked by a transparent zone, last whorl slightly con- 

 tracted in the middle, somewhat sack-like below. 



Length, 8'5 mill. 



Jalapa, Mexico. 

 O. PERPUSILLA, Pfeiffer. PL 9, fig. 32. 



Thin, longitudinally arcuately striate, pellucid, shining, yel- 

 lowish ; whorls 5, suture profound, narrowly margined. 

 Length, 4*5 mill. 



Mirador, State of Vera Cruz, Mexico. 



0. MODESTA, Pfeiffer. (Unfigured.) N(ar Vera Cruz, Mexico. 

 Pfeiffer writes " Conf. 0. perpusilla." It is about the same 

 size. 



Genus STREPTOSTYLA, Shuttleworth, 1852. 



Typical Section. 

 S. PERUVIANA, Lamarck. PL 11, fig. 97. 



Thin, subpellucid, longitudinally elegantly striate, decussated 

 with spiral striae, with spiral folds or lamellae at the base of the 

 shell, suture subcanaliculate ; white, with chestnut clouds and 

 streaks. Length, 48 mill. 



Peru. 

 It is Helix pretiosa, Fer. 



S. RICHARDI, Pfr. PL 11, figs. 85, 86. 



Rather thin, diaphanous, closely longitudinally plicate-striate, 

 the striae becoming obsolete towards the middle of the body- 

 whorl, everywhere closely spirally striate, suture impressed, 

 crenately margined ; orange-brown, with angular streaks of dark 

 chestnut. Length, 28 mill. 



Haiti. 

 S. NICOLETI, Shuttleworth. PL 11, fig. 93. 



Rather solid, opaque, longitudinally costulate, the sculpture 

 more prominent near the suture ; shining chestnut-colored. 



Length, 33 mill. 



Cordova, Mexico. 



