1847.] SHARPE ON THE PALHOZOIC ROCKS OF N. AMERICA. 159 
Species of Mollusca common to the United States and Europe. 
Lower Silurian, Wenlock. | Devonian. 
Species Species Species 
Total |common || Total | common Total | common 
number of'to Europe|{number of|to Europe|jnumber of|to Europe 
species. |& United || species. |& United || species. | & United 
States. States. States. 
BRACHIOPODA. 
BNF wi acesdtideddesegas: 
OCT 
PADDR FONG canine sie scones sen 
DIE acinadedasesscvcnas: 
RIMIEMIIE. a oacasccescnveaness 
Oe 
PPHTAWICIUS Li wsceecesasacc 
MPEIOLUS Ke cecciseinath ees xc 
AEM a oh a Soexca niet a on bac 
DETGMMOMICIA: «5.000.500 
PERCUEAGIID joc ccccectsocens 
REOEPMAUIS © Cel. cutccccoceceas 
on 
2 2 
2 
ll wo 
mo: 
rome: 
SuMOM DE: 
ono: Sf 
— 
“1ST DO & “a OO G2 Go o> 
Oo ht > Oo oo 
m= PDD? KH Ot) POON = 
— 
es eee 1 2 1 
OPICAEGIA © on... sens scons 1 “ fae ses 
Sundry genera ............ 6 ma Ge ee | 25 
eaneee nADERE 
+. -+- 
at eee Ee Ee Te Kia 
— 
cs 
tm O92 
GASTEROPODA. 
Sundry genera ............ 
HETEROPODA. 
Bellerophon .......-s...++> 
BI ciarasisies apmiediannes 
CEPHALOPODA. 
Orthoceras.................. 
Cyrtoceras ..........00.060. sia 
on 
ae | 
jo} 
ot 
p=S] 
— 
a 
or 
have in both continents nearly the same wide vertical range. 
Pentamerus galeatus, Strophomena grandis, 
Spirifer plicatus, . pecten, 
radiatus, Orthis orbicularis, 
— Urii, 
are found both here and in the United States, either in two or three 
formations. 
And a longer list may be formed of shells which are confined in 
