CEPHALOPODA— AMMONOIDEA. 149 



Rockford Goniatite bed (Kinderhook) of Indiana; Waverly 

 of Ohio. 



233. P. marshallensis Winchell. Mississippic. 

 Like the preceding but somewhat more involute; section of 



whorl elliptical ; differs in having additional pair of lobes outside 

 of the umbilical border, and in the greater length of the ventral 

 lobe. 



Marshall group of Michigan, and Waverly of Ohio. 



234. P.(?) compactus M. and W. (Fig. 1398, c-^.) Carbonic. 

 Whorls broad, slightly arched and with rounded umbilical 



shoulder; sutures with narrow, tongue-shaped ventral, and two 

 similar lateral lobes, and broad, rounded saddles. 

 Middle Coal Measures of Illinois. 



XCIV. Pronorites Mojsisovics. 



Discoidal, with high, narrow whorls, nearly parallel sides, very 

 involute, and with narrow umbilicus; siphonal lobe three-pointed; 

 first lateral lobe divided into two or three parts by secondary 



Fig. 1399. b-d, Pronorites cyclolobus var. arkansasensis, X K » '^j suture of same 

 enlarged. (After J. P. Smith.) 



sinuses; three to six auxiliary lateral lobes, all slightly pointed; 

 saddles all rounded. Mississippic-Carbonic. 



235. P. cyclolobus Phillips, variety arkansasensis Smith. (Fig. 



1399.) Mississippic. 



With narrower umbilicus than the species, and a greater number 

 of lateral lobes ; saddles constricted. 



Chester of Arkansas. The' species is widely distributed in 

 equivalent beds of Europe. 



