140S AN(^nOXTlTES 



.hiodon sirionis Catlow and Rekve, Conch. Xom., 1S45, P- ^8. 

 Mar^aron I Anodonta I sirionis Lea. Syn.. 1852. p. 51 : 1870, 



p. 82. 

 Glaharis sirio)iis Simpson, Syn.. 1900. p. 018. 

 Anodonta fcrrarisii d'Our.u'.NY. Guer. Mas:;".. 1835. P- 4^- 



\'en- close to .-i. wynuuiii. hut prohahly lUfferent. I luive 

 specimens before me that 1 refer with some doubt to this 

 species, which are somewhat rhomboid. It is hardly as solid 

 a species as n'^ymanii : it is not so much produced in the post- 

 basal region ; the texture is different, for instead of being 

 bright and warm within and without it is coUl and lurid. 



\'ar. ilicri)igi (Clessin). 



Shell slightly obovate oblong, subinflated, solid, inequilat- 

 eral, with well marked, concentric sculpture; beaks full and 

 high ; dorsal outline arched : anterior end somewhat narrowed 

 and rounded : posterior end subtnmcate above, widely rounded 

 below : base line lightly rounded : epidemiis chestnut : ligament 

 long, thick ; nacre whitish. 



Length 61, height 39. diam. 22 mm. 



Taguara del ]\Iundo novo. Brazil. 

 A>'.odorita ilieringi Cle.^six. Mai. Rl.. \', 1882, p. 191. pi. iv. 



fig. 5. 

 Glabaris ihcringi Simpsox, Syn.. 1900. p. 919. 



After comparing a set of what I take to be Clessin's A. 

 iheringi w-ith specimens of siriouis Orb. and the descriptions 

 and figures of the two species I am inclined to believe that the 

 former is not more than a variety of the latter. Clessin states 

 that his shell has chestnut epidermis and white nacre, but 

 there are specimens before me. in which the epidermis is olive- 

 colored and the nacre bluish-white. 



AxoDOXTiTES PAZii (LcaV 



Shell round-obovate. subinriated. subsolid. inequilateral ; 

 beaks moderately full, slightly elevated; dorsal line lightly 

 arched ; anterior end somewhat narrowed, rounded ; base 

 rounded ; dorsal slope obliquely subtruncate ; surface with ir- 



