Smith.] -^'^ [Oci. 2, 



Arkansas, on Pilot mountain, Carroll count}', three and a half miles 

 southwest of Valley Springs, in 17 N., 19 W., section 18, northeast 

 corner, in the Lower Coal Measures, so-called "Millstone Grit." The 

 beds are called A 10 in Prof H. S. Williams' section ; below them lie 

 fifty-five feet of micaceous sandstones and shales (A 9 of the section), 

 and below that coarse, reddish-brown fossiliferous limestone, supposed 

 to represent the Chester horizon of the Lower Carboniferous. 



The type figured on PI. xxiv, Figs. 1-4, is the property of the Ignited 

 States Geological Survey (National Museum), catalogue number Sta. 

 13To. The writer is indebted to Prof. H. S. Williams for the use of the 

 type. 



Other Localities — Pronorites cyclolobus has been found in England in 

 the upper part of the Mountain limestone ; in Belgium in the limestone 

 of Vise ; in the Kohlenkalk of the Hartz, in Germany, and the variety 

 urnlensis has been found in Russia in the Upper Carboniferous lime- 

 stone of the Ural mountains in C 2 of the section. 



Froiiorites, sp. indet., PI. xx. Fig. 2. 



In the Upper Coal Measures beds of Scott county, Arkansas, 1 N., 28 W., 

 section 4, southeast quarter of southeast quarter, wasf<mnd a single frag- 

 ment that seems to belong to this genus. It is septate, and must have 

 belonged to an individual about two and a half inches in diameter. The 

 sides are smooth and little embracing and almost parallel ; the coil is 

 thin and discoidal, and the ventral or external portion seems to be only 

 slightly arched. From the umbilicus towards the ventral portion are 

 seen five lateral lobes that are long and pointed, the saddles being some- 

 what rounded. The siphonal lobe and part of the first lateral lobe are 

 not seen, that part of the shell being worn so that they cannot be made 

 out, l)ut enough of the first lateral lobe is visible to show the secondary 

 sadtUe that divides it. The septa are very close together, as seems to be 

 the case on all species of this genus. 



The nearest known relative is Pronorites cyclolobus Phillips, var. 

 nralensis Karpinsky, Die Ammoneen der Artinsk-Stufe, p. 8, PI. i. Fig. 4. 

 The lobes figured on PI. i. Fig. 4, of Karplnsky's monograph are very 

 like those of the specimen from Scott county, and the general shape of 

 the coil, the height and the amount of the involution are about the same 

 on both. 



Class Crustacea. 



Order Trilohiti^. 



Genus PuiLLirsiA, Portlock Phillipsia cliftonensis Shumard, PI. xxii^ 



Fig. 5. Phillipsia cliftonensis Shumard, I'rans. St. L. Ac. lSci.,\o\. 



i, ]). 22G. Compare Phillipsia scitula Meek and Worthen, F. B. 



Meek, U. >S'. Geol. Surv. Mbra.s/,a, j). 2:58, PI. vi, Fig. 9. 



A single well-preserved pygidiuni seems to belong to Shumard's 



