192 AMERICAN OPEAS. 



"Synopeas carinulata. PI. 27, fig. 41. Shell perforate, 

 cylindric-turrited, rather thin, ribbed with hair-like striae, red- 

 dish-yellow; spire elongate, conic and turrited, the apex ob- 

 tuse. Whorls 7%, subconvex, separated by a deep suture, the 

 last one-fourth the total length, carinate in the middle. Aper- 

 ture subtrigonal-oval, the peristome simple, unexpanded, the 

 oolumellar margin straight, slightly refiexed. Length 6, diam. 

 2.25 mm." (Jouss.). 

 Caracas, Venezuela (Simon). 



Synopeas carinulata Jouss., Mem. Soc. Zool. de France ii, 

 p. 240, pi. 9, f . 6, 1889. 



Described from two specimens which I think are probably 

 .young shells. It is said to be distinguished from caracasense 

 and simoni by the smaller size, stronger, more spaced striae, 

 the more projecting carina of the last whorl, less convex 

 whorls, and the triangular shape of the mouth. Cf. 0. micra. 



Var. gabbianum (Angas). PI. 27, figs. 52, 53. 



' ' Shell perforate, elongately turreted, moderately thin, pale 

 straw-colored, sculptured with somewhat distant raised 

 thread-like descending striae, that are strongest on the upper 

 whorls and become evanescent towards the sutures and the 

 base of the last whorl; whorls 8, convex; apex blunt, papil- 

 lar ; aperture vertical, quadrately semilunar ; outer lip, arcu- 

 ate, thin, simple ; columellar margin a little expanded over 

 the perforation. Diam. 1*4, alt. S 1 ^ lin." (G. F. Angas}. 



Costa Rica ; a single specimen ( Gabb) . 



"A somewhat sparsely and strongly ribbed species, distinct 

 from S. caraccasensis Reeve, which is described by that author 

 as a Bulimus. ' ' (Angas) . 



Var. regular e (Pfr.). 



Surface striatulate, being much more weakly sculptured 

 than beckianum, but denticulate at the suture. 



Brazil: Rio de Janeiro (Macgillivray, Hidalgo). 



Length 6, diam. 2y% mm., whorls 7 (Pfr., young shell). 



Length 8, diam. 3 mm., whorls 7 to 8 (Hidalgo). 



Strebel's examination of the type leaves no doubt of the 

 rank of this form as a local variety of 0. beckianum. 



