THE NAUTILUS. 53 



Quadrulinae, as Hannibal proposes, for I emphatically want to 

 retain the European Unio in this group), and certain groups of 

 my " Unioninae" should be elevated to the rank of subfamilies. 

 Of the genera treated by myself in 1912 (1. c. p. 239, 240), 

 eight (Fusconaia to Uniomerus) should form the subfamily 

 Quadrulinae ; the European Unio should form the subfamily 

 Unioninae, and Parreysia and Lamellidens probably should form 

 a third subfamily. In addition, another new subfamily should 

 be erected for the present genus, that of the Gonideinae, with 

 the characters of shell and soft parts as indicated above. 



However, I refrain at present from working this out in detail, 

 since there are yet many, chiefly exotic (Asiatic) genera, which 

 require further study. 



A NEW LANDSHELL FKOM BRAZIL. 



BY PAUL BARTSCH. 



Among a lot of shells collected by Mr. H. M. Curran on the 

 Rio Grungugy, Bahia, Brazil, is an Oxychona which differs 

 from any of the described forms, and which I take pleasure in 

 naming after the discoverer : 



OXYCHONA PYRAMIDELLA CURRANI. New subspecies. 



The shell strongly suggests Oxychona pyramidella (Wagner) 

 described in his Testacea Fluviatilia Brasiliana, page 22, plate 

 16, figures 1 and 2, 1827, but differs from it by having the 

 spire entirely white. The lip of our shell is of old-rose color 

 while the broad basal band, which terminates a little before 

 reaching the aperture, is liver-brown with a glaucous suffusion. 

 The basal band is about one-third of the width of the base and 

 is separated from the peripheral angle by a narrow white zone 

 about one-fourth the width of the brown band. Our shell has 

 seven whorls and measures : height 18.4 mm., greater diameter 

 22 mm., lesser diameter 18.6 mm.; the aperture measures from 

 the columella to the outer angle of the keel 12.5 mm., from the 

 columella to the posterior angle 6 mm. The type is Cat. No. 

 322281 U. S. N. M. 



