SWALLOW AND HAWN—THE ROCKS OF KANSAS. 193 
Major Hawn’s collection from the Upper Permian Rocks, 
near Smoky-Hill Fork, K. T., associated with Monotis spe- 
luncaria, M. radialis, and Schizodus Rossicus 
Scuizopus TRIANGULARIS, Swallow. 
Shell small, sub-triangular, inequilateral, marked with fine, 
tri Both extremities are acuminate and rounded 
at the points; the anterior alittle broader and more rounded ; 
arge, prominent, incurved, approximate, nearer the an- 
terior extremity ; posterior sper inal slope rounded, slightly 
less convex than the anterior; both sharply carinated; ven- 
tral margin arched, curve increasing about equally at each 
-— 
ngth, 0.49; width, 0.36; thickness, 0.21. 
it most resembles ‘the ‘Schlothei imi, Geinitz, from the 
Upper Zechstein of Germany, and the Permian of England. 
The triangularis is more nearly equilateral, and is not trunca- 
associated with P. Cennecere, Cardinia Sth 5 on- 
the waters of the Cotton-wood, K. 
Scazoors opscurvs, Sowerby, Min. Con., Vol. IV., p. 12, pl. 
Senses osscurus, King, Per. Fos. p. 189, pl. XV. figs. 
We have but one e cast of this fossil. It is is very similar to 
Sowerby’s ef rage nd King’s figure No, 23 is — like our 
specimen as an e! aving can well be | e in: 
hye fossil is 1s found in many localities in the Permian fe Rocks of of 
anc and i in the Lower Permian strata of Kansas with © 
[ Semin To Rossievs, 1 Vernewil, Ge. Rus, Vol. ae 209, a 
2 | Semzones ROTUNDATUS, King, Per. Fos. p. 190, pl. xv., 
| - (Asin norexoaree, Brown, Man. Ge. Soc, Vol. T. 
of ranger and hae 
€ ovad ile identical with the Rossicus of es 
