puts it beyond the reach of most private 

 individuals. To the same able and inde- 

 fatigable zoologist, and to our colleague 

 Mr. Barnes, v^e are indebted for ample illus- 

 trations of our marine and fresh water shells. 

 The Monograph of the extensive and ob- 

 scure family of the Uniodese in the Ameri- 

 can Journal of Science, by Mr. Barnes, has 

 equally facilitated the inquiries of the stu- 

 dent, and elevated our scientific reputation. 

 The marine mollusca have been, with the 

 exception of the observations of Lesueur, 

 almost entirely neglected by our naturalists. 

 We know of no department in which more 

 interesting discoveries are to be made, or 

 which would secure a more honorable dis- 

 tinction to the young naturalist than the in- 

 vestigation of these curiously organized 

 beings. 



Having thus passed in rapid review the 

 whole kingdom of living nature, we should 

 consider our remarks as incomplete unless 

 we adverted to those extinct animals whose 

 study has received a new impulse from the 

 sublime genius of Cuvier. The great abund- 

 ance of the relics of beings which have now 



