AMERICAN OPEAS. 193 



2. 0. MICRA (Orbigny). PL 27, figs. 49, 56-57. 



Shell elongate, turriculate, thin, translucent, very strongly 

 striated with small sharp and raised ribs : nearly umbilicate ; 

 epire long, nearly conic, with the end obtuse, composed of 8 

 not much rounded whorls ; aperture oval, with sharp margins ; 

 columella straight. Color yellowish-white. Length 6, diam. 

 2.5 mm. This species is especially related to B. clavulus but 







differs chiefly by its raised ribs. (Orb.}. 



Bolivia : easternmost foothills of the Bolivian Andes, not far 

 from Santa Cruz de la Sierra, under stones (Orbigny, type 

 loc.). Brazil: Rio de Janeiro (Orb.) ; Fernando Noronha I.; 

 Para (Hubbard). Colombia at Honda (T. Bland). Trini- 

 dad (Guppy). 



Central America and Mexico: Polvon, Nicaragua (McNiel) ; 

 Utilla I., Honduras (Simpson) ; Progreso, Izamal, Ticul, Tun- 

 kas and Tekanto, Yucatan (Heilprin exped.) ; San Juan Bau- 

 tista, Tabasco (Rovirosa) ; Vera Cruz Heilprin exped.) ; 

 San Rafael Jicaltepec (Townsend) ; Antigua and Texolo, 

 V. C. (Rhoads). 



West Indies: Grenada, Grenadines, Barbados, St. Vincent, 

 Guadeloupe, Antigua, St. Eustatius, St. Bartholomew, St. 

 John, St. Thomas, St. Croix, Porto Rico, Haiti, Cuba and 

 Jamaica. Also reported by Tate from St. Lucia. 



Florida: Miami. 



Introduced in Bermuda (Heilprin!), Charleston, S. C. 

 (Binney) , Mauritius (Nevill !) . 



Helix micro, ORB., Mag. de Zool. 1835, p. 9. Bulimus micra 

 ORB., Voy. Amer. Merid. Moll., p. 262, pi. 41, f. 18, 19, 20.- 

 PFR., Monogr. ii, 165 iii, 400 ; iv, 462 ; vi, 100. REEVE Conch. 

 Icon, v, pi. 14, f. 78; pi. 79, f. 579 (Chilon, Bolivia) .Opeas 

 micra Orb., SMITH, Proc. Malac. Soc. Lond. i, p. 309, 318, 322 

 (St. Vincent, Grenada, Grenadines) ; Journ. of Conch, viii, p. 

 237 (Trinidad). 



Bulimus octonoides C. B. ADAMS, Proc. Boston Soc. Nat. 

 Hist. 1845, p. 12 (Jamaica). REEVE, Conch. Icon, v, pi. 84, f. 

 593. PFR., Monogr. ii, 160; iii, 400; iv, 460; vi. 99. Steno- 

 gyra octonoides MAZE, Journ. de Conch. 1883, pp. 6, 41 (Guad- 

 eloupe). BINNEY, Terrestrial Moll, v, p. 194, Man. Amer. 



