AMERICAN OPEAS. 189 



1. 0. BECKIANUM (Pfeiffer). PL 27, figs. 42-46, 54, 55. 



Shell perforate, ovate-oblong, acuminate, thin, diaphanous, 

 greenish-hyaline, densely costulate-striate, the riblets stronger 

 at the crenulated suture. Whorls 9, convex, the last about 

 one-fourth the total length, base rounded, columella short, 

 rather straightened. Aperture wide, semioval ; peristome sim- 

 ple, acute, the columellar margin spreading. Length 9, diam. 

 3.5, aperture 2.33 x 1.5 mm. (Pfr.). 



Eastern Mexico from the State of Vera Cruz southward; 

 Central America; Colombia, Venezuela, Trinidad; Barbados, 

 St. Vincent, Antigua ; Haiti. Brazil, at Para, Bio de Janeiro, 

 Sao Paulo, and Fernando Noronha, and Peru. 



Bulimus beckianus PFR., Symbolse ad Hist. Heliceorum iii, 

 p. 82 (1846) ; Monogr. ii, 164; Conchyl. Cab. p. 125, pi. 36, 

 f. 29-31. Opeas beckiana Pfr., SMITH, Proc. Malac. Soc. i, p. 

 309; Journ. of Conch, viii, p. 236; Journ. Linn. Soc. Lond. 

 xx, Zool., p. 502, 1890 (I. Fernando Noronha). ? Bulimus 

 oryza BRUG., Encycl. Meth. i, p. 333. DESH. in Lam., An. s. 

 Vert, viii, p. 263. REEVE, Conch. Icon, v, pi. 68, f. 480. 

 Bulimus caraccasensis REEVE, Conch. Icon, v, pi. 79, f. 580 

 (Sept. 1849). PFR., Monogr. iii, 404; viii, 140. Opeas car- 

 acasensis CROSSE & FISCHER, Moll. Mex. i, p. 599, pi. 26, f. 6. 

 STREBEL Beitrag v, p. 99, pi. 7, f . 8 ; pi. 17, f . 30 ; pi. 18, f . 

 4, 10, 11 (anatomy). CROSSE, Journ. de Conchyl. 1890, p. 

 45 (Trinidad, St. Lucia, Grenada, Guadeloupe, etc.). Opeas 

 micra and var. caracasense MARTENS, Biologia Centrali Amer., 

 Moll. p. 294, pi. 17, f. 10, 11. Synopeas caracasensis Jouss., 

 Mem. Soc. Zool. France ii, p. 239, 1889. Stenogyra caracca- 

 sensis Reeve, MAZE, Journ. de Conch, xxxi, 1883, p. 6, 41 

 (Guadeloupe). 



Bulimus regularis PFR., Zeitschr. f. Malak. 1852, p. 94; 

 Monogr. iii, p. 402; Conchyl. Cab. p. 152, pi. 39, f. 20-22. 

 HIDALGO, Viaje al Pacifico p. 123. Opeas regularis Pfr., 

 STREBEL, Beitrag Mex., etc., v, p. 102, notes on type. 



Stenogyra gab~biana ANGAS, P. Z. S. 1879, p. 485, pi. 40, 

 fig. 17. Bulimus vitreus Muhlf. in ANTON, Verzeichniss, p. 

 42, nude name, 'according to Pfr. 



