OPEAS, 295 
Stenogyra (Opeas) caracasensis, v. Mart. in Albers’s Die Helic. ed. 2, p. 265"; Malak. Blatt. xii. 
p. 48 (1865) ", 
Opeas caracasensis, Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p- 599, t. 26. figg. 6, 6a, bd”; 
Strebel, Beitr. Mex. Land- und Siissw.-Conch. v. p. 99, t. 7. fig. 8, t. 17. fig. 30, t. 18. 
figg. 4, 10 a, B,c, 11, 11 a (radula, jaw, and anatomical details) ™*. 
? Bulimus costatostriatus, Pfr. P. Z. S. 1856, p- 819"; Monogr. Helic. Vivent. iv. p. 460°; 
Strebel, loc. cit. p. 1017”. 
Hab. K. Mexico: Vera Cruz, on the beach and in the earth of flower-pots (Strebel 14, 
Hriedel *, Berendt ©) ; Cordova (Sallé%) ; Orizaba (Berendt !); Dos Arroyos and 
Barranca de Mahuistlan, both near Jalapa, in the wood of Pacho, and Mirador, at 
an elevation of 2630 feet (Strebel 14). 
S.E. Mexico: Chiapas (Ghiesbreght °); Teapa in Tabasco (H. H. Smith). 
N.W. Costa*Rica: Bay of Salinas, near Guanacaste (Pittier). 
S.W. Costa Rica: Savana of Guacimo, at an elevation of 200 metres above the sea, 
valley of the Rio Brus (Pitter) ; Turubanes, at an elevation of 500 metres above 
the sea (Biolley ®). 
Panama (Bland 1°). 
SoutH America: Colombia, Venezuela, Guiana, Brazil. 
ANTILLES: Haiti, Guadeloupe, St. Lucia, Barbados, Grenada, Trinidad. 
The typical shorter form (micra) of this species is represented in the Berlin Museum 
from Haiti, Caracas, and Rio Janeiro (here found by myself); the longer form (cara- 
casense) from 8. Paulo in Southern Brazil (v. Lhering) ; both from La Guayra in Venezuela 
(Gollmer) and Paramaribo in Guiana (coll. Dunker). D’Orbigny’s type was from Santa 
Cruz de la Sierra in Bolivia, and he mentions also specimens from Rio Janeiro. As 
regards the Antilles, the following smaller and more southern islands are mentioned as 
localities for O. caracasense by Bean, Guppy, and Tate: Guadeloupe, St. Lucia, Barbados, 
Grenada, and Trinidad. In Cuba, Jamaica, and Puerto Rico, on the contrary, the 
malacological fauna of which is very well known, it has not yet been found. 
The difference between the typical form (mécra) and the longer (caracasense) is 
rather striking, but intermediate forms occur. The strength of the coste is also subject 
to variation. | 
Pfeiffer, Fischer and Crosse, and Strebel treat O. micra and O. caracasense as distinct ; 
but a comparison of d’Orbigny’s original figure of O. micra with those of O. caracasense 
will show their extreme resemblance. Some confusion, however, has occurred con- 
cerning the identification of d’Orbigny’s species, for in the collections of the principal 
authorities, as in those of Cuming (Reeve, Conch. Icon. figg. 78 and 579), Pfeiffer (Strebel, 
loc. cit. t. 7. fig. 4 and t. 17. fig. 15), and Albers (now in the Berlin Museum), there 
are; with the name “ micra, d’Orb.,” shells which do not at all agree with d’Orbigny’s 
description and figure, but are more like the young forms of 0. subula. Pfeiffer ® was 
