Description of six new species of Fossil Shells from the 
Tertiary of Maryland and New Jersey. 
Tue shells here described, are from that part of the Ter- 
tiary mass called by Mr Lyell the older Pliocene Period. 
They are presumed to be new, and their descriptions are 
presented as a small contribution towards the elucidation 
of that part of our Geology. 
BALANUS. Bruguiere. 
Balanus Finchii.* Plate 6. Fig. 222. 
Description. Shell short, conico-cylindrical, smooth, 
nearly erect ; substance of the shell rather thick ; aper- 
ture nearly square ; valves rather pointed above. 
Length 5-20ths, Breadth .3, of an inch. 
St Mary’s, Maryland. John Finch. 
Observations. Although this shell has no striking 
character, it cannot be placed with any species I am 
acquainted with. I am under obligations to Mr Finch, 
for this and many other species from St Mary’s. He very 
kindly placed them in my cabinet, shortly after his return 
* Named after the geologist to whom I am indebted for the specimen. 
