66 BULIMULUS-SOUTH AMERICAN. 



of the Histoire), it is clear that no date earlier than 1838 can be 

 claimed for the Ferussacian illustration, unless ample authority can 

 be adduced proving its earlier publication. 



B. tenuissimus FEB., Hist., pi. 142 B, f. 8 (see pi. 9, figs. 53, 54) is 

 according to Deshayes, " A thin, transparent, extremely fragile shell 

 of a very pale corneous color, appearing smooth, but when seen under 

 a strong lens the surface is found to be latticed by growth striae and 

 obsolete, inconspicuous transverse striae." It has been united by 

 Mr. E. A. Smith (Ann. Mag. N. H., 6th ser., viii, p. 252) with B. 

 barbadensis Pfr. ; but I am satisfied that they are not identical. At 

 all events, barbadensis seems to be distinct from the Brazilian shell 

 first described as tenuissimus, and to which the name is here re- 

 stricted. 



The locality " Cayenne," given by Pfeiffer, rests upon authority 

 of doubtful value, depending upon the correctness of his reference of 

 B. corneus P. & M. (not Sowb.) to tenuissimus as a variety. It is also 

 quoted from Angostura on the authority of specimens called B. tennis 

 by Dunker, which PfeifFer regards as tenuissimus. Trinidad, Bar- 

 bados, Grenada, and St. Lucia have also been cited as localities for 

 B. tenuissimus; but I regard the shells from these localities as spe- 

 cifically different. 



B. PUELLARIS (Reeve). PI. 11, fig. 8. 



Shell subperforate, ovate-conic, thin, smoothish, showing very 

 minute oblique striation under the lens, diaphanous, whitish. Spire 

 conic, acute ; suture impressed. Whorls 6, but slightly convex, the 

 last somewhat shorter than the spire, rounded at base. Aperture 

 oblique, truncate-oval ; peristome simple, unexpanded, the right 

 margin receding at base; columella shortly reflexed above, subap- 

 pressed. Alt. 22, diam. 10 mill.; aperture 10 mill, long, 6 wide. 



Brazil (Cuming coll.). 



Balimus puellaris REEVE, Conch. Icon., pi. 86, f. 637 (Feb., 

 1850). PFR., Monogr., iii, p. 411. 



An elegantly convoluted, semitransparent shell. (Rve.). 

 B. GORRITTIENSIS Pilsbry. PL 11, figs. 9, 10. 



Shell perforate, ovate-turrited, thin and fragile, corneous-brown 

 or dirty corneous-whitish. Surface slightly shining, sculptured with 

 irregular and rather coarse wrinkles of growth. Spire elevated, 

 rather slender, the lateral outlines straight ; apex quite obtuse, the 



