NON-MARINE MOLLUSCS OF SURINAM. 19 
As von Martens considers his 0. micra and O. caraccasense 
Rve to be synonymous, and according to Pilsbry O. ca- 
raccasense is identical with O. beckianum Pfr., very likely 
the true O. micra has not been found till now in Surinam. 
* 45. OPEAS BECKIANUM Pfr. 
Bulimus beckianus, Pfeiffer, Symb. ad Hist. Helic. ITI, 1846, 
p. 82. 
Bulimus caraccasensis, Reeve, Conch. Icon., Vol. V, 1849, 
Bulimus, spec. 580. 
Opeas beckianum Pfr., Pilsbry, Man. of Conch., 2. ser., Vol. 
XVIII, 1906, p. 189, Pl. 27, f. 42—46, 54, 55. 
Post Groningen. Voltz. 
Post Groningen. van Heurn, 1911. 
Environs of Paramaribo. van Heurn, 1911. 
Pfeiffer, 1872, p. 76. Environs of Paramaribo. 
In one Paramaribo-specimen and in the Post Groningen- 
specimens the whorls are narrower, and the spire is a 
trifle more pointed than in the two other, more elongated 
specimens from Paramaribo. 
* 46, OPEAS HEURNI nov. sp. (fig. 9). 
Shell narrowly perforate, oblong, thin, subtransparent, 
stained with whitish spots; spire turrite, with rather obtuse 
summit. Whorls 6'/,, convex, slowly increasing, arcuately 
and faintly striate. Aperture subvertical oval; outer and 
basal lip thin; columellar margin reflexed. 
Length 8, diam. 3, length of aperture 2%/, m.M. 
Type in the Leyden Museum. 
Environs of Paramaribo. van Heurn, 1911. 
I could not identify this shell with any of the species 
recorded from South-America. Mr. Robson wrote to me 
this Opeas being very near an unnamed species from Brazil 
in the British Museum. 
I have much pleasure in dedicating this new species to 
its discoverer Jhr. W. C. van Heurn. 
* 47. SUBULINA OCTONA Brug. 
Bulimus octonus, Bruguière, Encycl. Méth., 1, 1792, p. 325. 
Notes from the Leyden Museum, Vol. XXXVI. 
