Review of the New York Geological Reports. 67 
Of these the Pleurorhyncus, fig. 5, has probably the widest 
range ; at least there isa Plewrorhyncus found m the shell strata of 
the Fallsof the Ohio, which b trong bl to this figur 
The principal differerice is, that the full grown western species seems 
to have a greater number of ribs than the eastern, fig. 25... There 
are other shells in the same rock of a type analogous: to figs. 2 
and 4, but the specific identity cannot at present be established. 
In the report of the fourth district, the following characteristic 
fossils occur in the rock at Williamsville, Erie County. 
eoeee, 
“pyou 
SS 
== —— 
. SSS: 
—=——— 
———— 
—— 
SS 
———— 
SES 
“pjIa4a DINIOLIES *O 
U0] 2} AO MBIO BO} DOUL|quasas S}I WO ‘suUOd 
“ ‘snusofirpivo (¢) vaudsag *[ 3 
‘BL “A odey 8jeH 
‘snpunjos (g) snppydwong “y 
why) °¢ 
mou v ‘nayouoyug *| YG ‘LOIN Og ‘siumjnas sanynomquas, °% 
= 
TQ. ~eFanuassy.19 oisa 
s. 4 and 5 are identical with specimens in our possessicn 
from the shell strata of the Falls. Fig. 2 is supposed to be of 
