NEW SNAILS—PARODIZ 453 
rather yellowish, but underneath the shell is very dark. The strong 
keel at the base is white, and the white line of the suture is narrower. 
The white “hydrophanous” bands that Pilsbry said are characteristic 
of fasciatus and are essentially cuticular in this subspecies are on the 
contrary more evident in denuded shells. 
Holotype (USNM 316130) from Bogot4(?), Colombia, Henderson 
collection. Two paratypes. Measurements are as follows: 
Height Diameter Aperture 
Holotype 39. 5 12, 5 15x8.5 
Paratypes 38. 5 11.5 14.5x8 
38 11. 5 14.5x8 
O. fasciatus has been regarded by authors as a form or variation of 
O. grayanus (Pfeiffer), but Pilsbry thought it might prove to be 
specifically very distinct (Manual of conchology, ser. 2, vol. 14, 1901). 
The specimens I have observed indicate that his opinion is entirely 
correct. 
These specimens of tenuisculptus, as well as other typical fasciatus, 
are all labelled in the U.S. National Museum as from “Bogota, 
Colombia, Henderson colln.’”’ I suppose that this is a mistake, 
because all the known species of this genus are living in southern 
Brazil, Paraguay, and North Argentina. Not one is known from 
Bolivia, Peru, or Ecuador. The Paraguay River evidently is the 
extreme western limit of the genus. If the locality ‘“‘Bogot&” were to 
be confirmed, we would have to admit to a distribution southeast to 
northwest across northern Brazil. 
Genus Tomigerus Spix, 1827 
Subgenus Bonnanius Jousseaume, 1900 
Tomigerus (Bonnanius) ramagei (Smith) 
Bulimus (Tomigerus) ramaget Smith, Journ. Linn. Soc. London, vol. 20, Zool., 
p. 500, 1890. 
Hyperaulax (Bonnanius) ramagei, Pilsbry, Manual of conchology, ser. 2, vol. 14, 
p. 103, 1901. 
Type locality: Fernando de Noronha Island. 
Topotype specimens (USNM 518215 and CM 3654) were examined. 
The presence of this species on Fernando de Noronha Island may 
be the reason why Pilsbry placed Bonnanius as a “section’’ of Hyper- 
aulax. The shape, apertural dentition, and expecially the smooth 
nucleus are as in Tomigerus; Hyperaulaz has instead a variable zigzag 
broken sculpture on the protoconch. 
The species Bonnanius bouvieri Jousseaume (type of genus) is a 
synonym of ramagei Smith. 
