GONIOLOHOCEHAS. 1'2'6 



.smaller .specimen would dinihtle.ss show the Afjmiides stage of development 

 with undivided veutrnl lobe, Imt tlie writer did not .succeed in breaking- out 

 iuiy smaller sliell than diameter of 10 mm. 



Occurrence. — Lower (Carboniferous, Kinderhook .stage, goniatite beds of 

 liockford, Indiana. Wincliell has also cited this species from the Kinder- 

 hook, Marshall gToup, of Jlichigan. 



The septa sliown on I'l. XVI, fig-. 3, are drawn from a specimen in tlie 

 writer's collection. The illustration on 1*1. XIX, fig-s. 1 and 2, are copied 

 from Hall's Pala-untology of New York, Vol. V, Pt. 11, PI. LXXIIl, figs. 

 1 and 2. 



Genus GoNioLOHOCERAS Hyatt. 



G0NlOL0H0CER.\S ? ALLEI Wiucliell. 



1862. Go?iiatlte« a//ri,A. Wiiichell. Am. Jour. Sci.. 2d series, Vol. XXXIII. p. 363. 

 1870. Gonkd'deit aJlvi , A. Wiiu-hell, Proc. Am. Philos. Soc, Vol. XI. p. 258. 

 1870. Goniatitei( allei, A. Winchell, Sketches of Creation, p. 116, fig. 50. 



Shell discoidal, laterally compressed, involute. Abdomen highly 

 arched and narrowly rounded, sides flattened. Umbilicus closed, not show- 

 ing any of the inner whorls. Whorl increasing rapidly in height and 

 indented to one-half of its height by the preceding volution. Surface orna- 

 mented with fine spiral lines, and with four constrictions to a revolution. 

 Septa consisting of a shallow, broad, pointed external lobe, divided by a 

 broad ventral saddle, which is probably notched: a broader and pointed 

 lateral lobe. The first and second lateral saddles are somewhat similar to 

 the lateral lobe, but rather rounded; internal septa consisting of a pointed 

 dorsal, and pair of similar laterals. This form is doubtfully referred to 

 GonioJoboceras, but Winchell's description is inadequate, and his figure in 

 Sketches of Creation is hardly more than a sketch. 



Occurrence. — Lower Carboniferous, Kinderhook stage, Marshall group, 

 Marshall, Mich. 



GONIOLOBOCERAS GONIOLOBUiM Meek. 



PI. IV, figs. 1-3. 



1877. Goniatifef qonfolohn^, F. B. Meek, U. S. Geol. E.\])l. Fortif^th PiU-allei. Vol. 

 IV, Pt.' I, p. 98, PI. IX, tigs. 5, 5a, 5b. 

 Meek's Goniatites goniolobiis was taken by Hyatt " as the type of the 

 new genus Gonioloboceras, of the family Magnosellarida-, characterized by 



" Cephalopoda, 1900, p. 551. 



