74 Xorth America /( 



The Upper Carljoxiferol'S sN^stein coDt.iiiis in Pennsylvania 

 the Maucii Chunk ivd shales, Potlsville conglomei'ate, and ihe 

 Lower, Barren, and Upper Coal Measures. The Upper Coal 

 Measures of Kansas. Nebraska, &c., cont;iin the following car- 

 boniferous trilobites : Fltillipsia CUftonensif^, P. major ; in Illi- 

 linois, Griffitliides Sangamonen^iSy and G. scitula. The Middle 

 Coal Measures of Missouri contain FliilUp.sia Missuurieusis. 



Among the carboniferous trilobites described and figured from 

 the Upper Coal Measures of the West, theie are two forms re- 

 ferred by Dr. Schiel (Rep. Expl. Sur. Miss. River to the Pa- 

 cific Ocean, Vol. 2, p. 1, figs. 11 and 14), to the genus PliiUip- 

 sia. The first, fig. 11, from Westport, is too imperfect to de- 

 termine ; the second, fig. 14, fi-om Indian Creek, may be Pliil- 

 lipaia major, Shumard. 



Dr. Geinitz (Carb. und Dyas in Neb., p. 1, pi. 1, fig. 1), men- 

 tions and figures a small joygidium from the Ui)per Coal Mea- 

 sures of Plattsmouth, Neb., which he refers to the genus Pliil- 

 lip;<ia. 



III.— PROETIS. 



Plate II, figs. 1 aud 2. 



Proetus, Steiniuger, 1881, Mem. Soc. Geol. de FraDce, Vol. 1, p. 8oo, pi. 21, 

 fig. 6. 



Description. — General form of the body oval, the trilobation ver}'^ distinct 

 through the entire length of the body. The head is less than a third of the 

 total length ; the pygidium is rather longer than the head. The cephalic 

 shield is always surrounded b}'^ a border, consisting of an exterior raised 

 rim and an inner groove or furrow. The movable cheeks are sometimes 

 prolonged into spines at their posterior angles. The posterior margin of the 

 head is formed h\ a grooved or furrowed border of the free cheeks on 

 each side, and by the two basal lobes and tlie neck-lobe, which are separated 

 from the glabella by a very distinct and deep furrow. The occipital lobe is 

 broader than the axial rings of the thorax which follow it. The glabella is 

 usually rounded and gibbous in front, but does not overhang its anterior 

 border ; it has three pairs of short lateral furrows, although not always 

 easily distinguished. The basal lobes of the glabella are very distinct. 



The facial suture crosses the frontal border just in a line with the com- 

 pound eye. above which it expands, forming a round palpebral lobe ; then 

 passing down close to the line of the axial furrow, it diverges outwards and 

 crosses the posterior border obliqueh' behind the line of the orbit. The 

 movable cheek is triangular, its surface is convex, and upon the highest 



