64 
[Assembly 
Descriptions of new species of organic remains, 
StrophomenAj Raf, 
1. S. eliptica. Shell elliptical; inferior valve ventricose, gibbous in 
the middle, radiating strise acute, remote; umbo elevated, ventricose, sum- 
mit rounded; beak much incurved; superior valve striated; lateral ex- 
tremities angulated, prominent. Length, I inch. Locality y Roches- 
ter, in formation No. 6. See table. 
2. iS^. ddtoidea. Shell deltoid, with numerousjadiating strioe and con- 
centric rugose undulations, obsolete on the inferior half of the valves; 
inferior valve slightly convex above, gibbous, abruptly rounded and flat- 
tened at the base; striaB small and crowded; one or two lines in the 
middle of the valve larger and more prominent than the others; angles 
of the cardinal line slightly prominent. Length, 1 inch. Locality^ 
Trenton-Falls. 
3. lineata. Shell suboval, length greater than the height, inferior 
valve convex; lateral margins rounded, and forming, with the basal mar- 
gin, a nearly regular arch. Length, f inch. Locality ^ Cayuga lake. 
4. S. carinata. Shell suborbicular, with from 16 to 18 angular ra- 
diating ribs; superior valve with a sinus in the middle; inferior valve 
angulated in the middle, slightly flattened on the sides; base prominent 
and subangulated in the middle; basal margin sinuous. Length, % inch. 
Localities J Helderberg mountain, in limestone; Ludlow ville. 
5. S. modesta. Shell alated, compressed, with obsolete radiating 
strias; inferior valve slightly convex; extremeties of the cardinal line 
acutely angulated; within punctate. Length, J inch. Locality ^ Ro- 
chester, Mr. Hall. 
Lingula, 
1. L. cuneata. Shell cuneiform; lateral margins subrectilinear; beaks 
acute; valves convex towards the apex, flattened on the inferior half; 
base slightly arcuate. Length, h inch. Locality, Medina, Orleans co. 
2. L. acuminata. Shell acute, acuminated at the apex; somewhat 
gibbous on the umbo and compressed laterally; basal margin rounded. 
Length, I inch. Locality, uncertain; in "calciferous sand rock." 
3. L. concentrica. Shell ovate-acute, with very regular numerous 
concentric raised strise; lateral margins subrectilinear in the middle. 
Length, i inch. Locality, Helderberg mountain, in limestone. 
\ 
