142 
those of the Mexican gulf have 
never been attended to as yet 
Thus we have 600 to add to the 
1000 above, and inay expect to 
have 1600 sp. of fishes to describe 
and figure of which 1000 are 
new ! to the science. Yet all are 
valuable, since they afford food, 
fisheries and sport. 
a s. e 
104. New Fossil Shells of Penn- 
sylvania, by C. S.Eafinesque . 
Among the 40 N Sp. of Bivalve 
fossils found this year on Sher- 
man cr. in the Alleghany mts. 1 
select those which are unequila- 
teral as the most curious, and I 
shall describe 10 of them giving 
above the figures of 7, ranged 
under 3 new genera. All are 
Inequivalve. 
1. N. G. Hemisterias Eaf 
Shell transversal with £ wings 
thus unequilateral, hinge witl 
two teeth and an angular sinus 
outside at the beak, margin lo- 
fi ed- jFI. quadriloba fig. 1. 
Four obtuse lobes and 3 obtuse 
si nu sses, lateral lobes like wings 
one much longer, an oblong fur- 
row on each lobe, length half of 
breadth. 
£. N. G. Texisteophis Eaf 
Shell unequilateral transversal 
with one wing on the longest side, 
hinge without beak, straight with 
a round impression inside at the 
apex, margin unlobed-— T. tor sola 
fig 7. Shell convex, minute longi- 
tudinal curved strias, short side 
rounded, long side with a twist- 
ed obtuse wing, length £-5ths of 
breadth. ...Impression in Petrosi- 
lex. one inch- 
3. N. G. Pxeureterxtes R. 
Shell unequilateral transversal 
without wings, hinge more or less 
curved simple or with a wrinkle 
and a beak, margin unlobed— 
The name means irregular sides, 
Telistrophis means spotted hinge, 
and Hemisterias means half star- 
ry. ...8 sp. 
1 Sp, PL laterisiria B* fig- 2- 
Shell oblong, small side smooth, 
longer side with 5 transversal 
furrows, axis far behind, length 
one third of breadth.... In petrosi- 
lex, one-inch long. 
£ Sp. PI divisa E. Shell oblong 
divided in the middle by a large 
furrow and small sinus at the end 
of it, 5 curved ribs on the small 
side, 7 on the large divided by 
deep furrows, small side rounded, 
longer attenuate, axis preeminent 
sub medial, length half of breadth 
....In grey petrosilex, over one 
inch. 
3 Sp. PL anisoda Eaf. Shell 
swelled rounder, a, deep furrow 
in the middle, 8 curved unequal 
ribs, 4 on each side, small side 
round, longer side truncate, beak 
preeminent submedial, length 
3-4ths of breadth.... In variega- 
ted petrosilex, about one inch. 
4 Sp. PL latiundata E. fig. 6. 
