176 JMiscellanies. 
34. U. corrugata, Lam. Undoubtedly distinct. 
ae aoduleca, Tarh. Possibly the young Alasmodonta 
undulata of Say. 
36. U. varicosa, Lam. Resembles the 4. undulata, Say. 
37. U. granosa, Lam. A distinct species. 
38. U. depressa, Lam. af Do. 
39. U. virginiana, Lam. radiatus of Barnes. 
40. U. luteola, Lam. ~ A variety of Say’s cariosus. 
41. U. marginalis, Lam. Distinct. 
42. U. angusta, Lam. A variety of pictorum. 
2s wine een! It may be a distinct species, but re- 
sembles a variety of pictorum. 
44. U. cariosa, Lam. The cariosus of Say. 
Ae, Sopesarse me cies: be identified with any of 
Ao. cs uielie Lain: Cannot be identified with any Amer- 
ican shell. 
Agi) Wapmadan (ica dlcnee. fee the Anodonta undulata 
of Say 
48. U. suborbiculata, Lam. Cannot be identified. 
Mr. Lea concludes hisreview of Lamarck’s genus with the fol- 
lowing candid remarks respecting the reputation of that conchol- 
ogist. 
‘“‘In passing criticisms upon the species of the genus Unio, of this 
creat naturalist, Ido not in the Jeast wish to detract from his great 
and merited fame. My object is expressly to endeavor to facilitate 
the study of this interesting genus, and to remove as far as I have it 
in my power, the confusion which has creptinto it. My observations, 
I wish to pass only for what they may prove to be worth.” 
With respect to Mr. Lea’s observations on the structure and habits 
of the animals which construct these shells, we find his remarks upon 
the anatomy of the Unio irroratus (Lea,) the most deserving of at- 
tention. He has been the first observer of any anatomical differ- 
ence among the Naiades. ‘The peculiarity relates to the form and 
position of the oviducts; and is one which is obviously indispensable 
to suit the construction of the shell. It is an adaptation of the ut- 
most felicity ; and would seem to be the result only, of a most in- 
tricate geometrical calculation. 
In relation to the food of the Naiades he remarks in his last paper 
as follows : 
