AXODONTITES 1 425 



Anodonta inccquivalris gnmadensis von Martens, Biol. Cent. 



Amen, Moll., 1900, p. 535. 



Probably only a variety of inequivak'is but rather more elon- 

 gate in outline, more delicate and having generally, though 

 not always, a pale flush at the base of the shell in front of the 

 posterior ridge. Sometimes this buff color is extended around 

 the outer edge of the shell as a band. 



AnodonTites depexus (von Martens). 



"Shell solid, ovate-rhomboid, rather convex, sculptured with 

 light, radiating grooves and concentric, frilled striae, oliva- 

 ceous ; beaks not prominent ; shortly rounded in front ; dorsal 

 margin straight, slightly ascending; postero-dorsal angle ob- 

 tuse ; ventral margin somewhat curved ; posterior end subros- 

 trate, oblique above, rounded below ; nacre pale bluish, very 

 iridescent towards the margin, edge of margin black ; sinulus 

 triangular, anterior margin almost perpendicular. 



Length 67, height 41.5, alae 45, diam. 24 mm. \^ertices in 

 T-3 long. 



Length 64, height 39.5, alse 45. diam. 23.5 mm. ^'ertices in 

 1-3 long. 



Length 46, height 29, ala? 31, diam. 16 mm. \'ertices in 1-3 

 long." (von Martens). 



Type locality, Paso Antonio, Rio Michatoya, W. Guatemala. 

 Anodonla def'c.va von Martens, Biol. Cent. Am., Moll., 1900. 



p. 538, pi. i.xr, figs. 3, ^a-c. 



"Three specimens of nearly equal size and a younger one are 

 before me, all having shallow furrows radiating from the sum- 

 mits towards the ventral margin, which cut the concentric 

 strife of growth and cause them to become more or less frilled ; 

 in the fore and hinder parts of the shell these furrows are not 

 to be seen, and in the hinder part, at a determined line, they 

 disappear and the concentric lines become simple, more crowd- 

 ed, and somewhat membranaceous and projecting, the appear- 

 ance here being more dull and dirty, contrasting with the some- 

 what shining olivaceous color of the middle and fore parts. 

 This peculiarity is visible in all four examples, but in a some- 

 what different degree ; whether it is due to the structure of the 



