PRONOKITES. 43 



These occurrences lielp to prove tlio continuity of life from tlie Car- 

 boniferous into the Permian, and to show that tliu same conchtions existed 

 here as in the Artinsk region of the Ural Mountains, where the Carbonifer- 

 ous beds contain the goniatites out of which most of the Permian iunmouites 

 were developed. 



Pronokites cyclolobl-s Phillips, variety arkansasensis Smith. 



PI.' XII, fig-s. 12-15. 



1836. Goiiiatltoi cyclulvhas, ,]. PhilHps, (ieol. Yorkshire, Pt. 11, p. ^37, PI. XX. tig.s. 



40-4:2. 

 1845. Goniatites cyclolohux, Murchison. Vernouil. and Kevserliiio-, Geol. Kus.sie 



d'Europe, etc., Vol. II, p. 37u, PI. XXVll, tig. 4." 

 1855. Goniatites cyclolohus, F. A. Roemer, Palajontographica, Vol. V, p. 1<>7, PI. 



XXVII, %. 1 (not Pt. II, p. 95. PI. Xlir, tig. 34). 

 1800. Goniatites cyclolohus, F. A. Roemer, Paheontographica, Vol. IX, p. 11, PI. IV, 



figs. 1, a, b, c. 

 18S0. Goniatites cyclolohus. L. G. de Koniiick, Faune t-ale. furljoii. de la Belgique, 



Vol. I, p. 273, PI. L, tigs. 5, 0. 

 1882. Pronorites cyclolohus, E. von Mojsisovics, Cephalop. Mediterranen Triasprov- 



inz, p. 201. 

 1SS4. Pronorites cyclolohus, A. Hyatt. Proc. Boston Soc. Nat. Hist., Vol. XXII, p. 337. 

 1884. Pronorites cyclolohus, K. A. von Zittel, Handbuch der Palajont. , Vol. II, p. 421, 



fig. 580. ' 



1888. Goniatites cyclolohus, R. Etheridgc, British Fossils, Vol. I, Palivozoic, p. 311. 



1889. Pronorites cyclolohus var. uralensis, A. Karpinskv, Aiumoneen der Artinsk- 



Stiife, p. 8. PI. I. fig. 4. 

 189U. Pronorites cyclolohus, Steinmann and Doderlein, Elemente der Paliiont., p. 395, 

 fig. 475. 



1895. Pronorites cyclolohus, K. A. von Zittel, Griindziige der Palajont.. p. 400, 



fig. 1089. 



1896. Pronorites cyclolohus var. a7'kansasensis, J. P. Smith. Proc. Am. Philos. Soc, 



Vol. XXXV, p. 267. PI. XXIV. figs. 1-4. 



1897. Pronorites cyclolohus, Foord and Crick, Catal. Foss. Ceph. Brit. Mus. , Pt. Ill, 



p. 264, fig. 125. 

 1900. Pronorites cyclolohus, A. Hyatt. Cephalopoda, p. 562, fig. 1156. {'HotGoniatites 

 cyclolohus Barrois, Mem. Soc. Geol. du Nord., Vol. II. p. 295. PI. XIV. 

 fig. 2, ?i-Q = Pronorites harroisi Karpinsky.) 



Phillips's original description of (ioniatiies cyclolohus is as follows: 



Discoid, sides fiat, hack V)road. inner whorls half concealed, septa with four round 

 lateral lobes, a small double dorsal lobe, and small acute dorsal sinuses, the first 

 lateral sinus double, the others simple, all round. 



This description is too meager to be of more than generic value, and 



also the term "dorsal" is used where now "abdominal" is in common use. 



The shell is smooth, discoidal, verv involute. The sides are nearlv 



