I/UILA 1399 



visible between them belongs to the right valve. The sinulus 

 is triangular, hook-shaped below and sharply pointed in front 

 and lies at the posterior end of the dorsal margin. The um- 

 bonal cavity is comparatively deep. The muscular impressions 

 are deep. The prismatic border of the shell is 3 mm. wide at 

 the anterior portion of the ventral margin. The very irides- 

 cent nacre is pale reddish with large greenish spots." (von 

 Ihering). 



Type locality, Rio Paraguassu. State of Bahia, Brazil. 

 Fossiila hra::iliensis von Iiikuing, Ahh. Senck. Ges., XXXII, 



1910, p. 116, pi. 12, figs. la-b. 



"This species is easily distinguished from F. fossicnlifera 

 by its smaller size, less prominent teeth and the more posterior 

 position of the sinulus. One specimen from Machedo Por- 

 tella has two carina? defining the dorsal area. Two other spec- 

 imens from the same locality are 52 mm. long and have a well- 

 developed lunule, short and broad. The epidermis of these is 

 a dark brown or olive-brown color. 



Genus LEILA Gray, 1840. 



Columbo Li'A (not Columba Linnaius. Aves, 1758), Tr. Am. 



Phil. vSoc, V, 1833, p. 78. 

 Leila Gray, Syn. Brit. Mus., 1840, p. 142. 



vShell large, obovate, inflated, with a straight hinge line, 

 which is produced into a slight wing before and behind; the 

 posterior end bluntly pointed and somewhat truncate above, 

 with a faint posterior ridge; beaks full, smooth; epidennis 

 olive, generally smooth ; hinge edentulous ; beak cavities rather 

 shallow ; dorsal scars small an.d numerous, running in a 

 straight line from behind the beaks downward and forward ; 

 posterior muscle scars united, large; pallial line generally 

 showing a sinus. 



Animal having the mantle united behind into two short, sep- 

 arate, contractile siphons, according to Gray. 

 Type, Anodonta blainiilleana Lea. 



