
69 




Unio delumbis, Conrad, na~ere ae lahes Yr oe acl 
Pig anne | Lavds jo ebenus, Lea, 
: (gracilis, - Barnes, 
_— + fiagilis, Raf. ‘eect graci- is 
fragilis, Swainson, 
flavus, Raf. rubiginosus, Lea, 
( sinuatus, (very old,) Raf. 
phaseolus, Hildreth, 
i fasciolaris, Raf. } mucronatus, Barnes, 
baer, i fea, 
bicolor, ? _ | Raf. ,-, 
1 ~  flexuosus, Raf. ¢ elu lit  “-€ pote » 
a » _ foliatus, Hildreth, © 
i ‘ fasciatus, Raf. carinatus, Barnes, »« *4* 
: » furvus, Conrad, 
q glans, Lea, 
; q e i, eer & slebulus, Say, 
% | CPO Conrad, 
' *heterodon, Lea, <4 
_ heros, Say, multiplicatus, Lea, 
* interruptus, Raf. brevidens, Lea, 
icterinus, Conrad, 
© 1738, Lea, Cee ; 
+ inflatus, Barnes, eran Raf 
-* This species was first named heterodon by my father, in con- 
- versation with Mr. Mason, long before the description was ; 
published or even written. Mr. Mason communicated the 
name as well as the species to Mr. Lra, who gives his friend 
credit neither for the name nor for discovery of the fact that the 
lateral tooth is double in the right valve, as in justice he should 
have done. I make these remarks, because Mr. LE insists 
that U. plicatus, Say, must be credited to LesEvER; and, if so, the 
_ species in question must be called U. heterodon, of Mason, as the | 
circumstances under which these two species were described are 
parallel. 

