68 Carboniferous ammonoids of America. 



it in 111}^ cabinet under the latter nanae. A closer examination, however, shows 

 points of difierence which appear to me to he of specitie value. The stria? of our 

 shell arc finer and more crowded; the dorsum [abdomen] is more broadly rounded, 

 and tiie umbilicus is proportionally smaller. 



This description shows the species to belong to the group of G. striatus, 

 and the differences noted are precisely those characteristic of G. crenistria, 

 which has been found in both Arkansas and Texas, and of which Goniatites 

 choctmvensis may turn out to be a synonym. 



Occurrence. — Lower Carboniferous, St. Louis-Chester stage (?), Bend 

 formation, Choctaw Nation (?), Ind. T. 



Goniatites crenistria Phillips. 



PI. X, figs. 12-16; PI. XIV; PI. XV; PI. XVI, figs, la-j; PI. XXVI, figs. 1-5. 



1836. Goniatites crenistria, J. Phillips, Geol. Yorkshire, Pt. II, p. "iS-i, PI. XIX, 



tig.s. 7-9. 

 ISll. Goniatites crenistria, J. Phillips, Pal. Foss. Cornwall, Devon, and W. Somerset, 



p. 121, PI. L, tigs. 23-ia-g. 

 1813. Goniatitex crenistria, F. A. Roemer, Verstein. Harzgeb., p. 33, PI. IX. 



figs. lOa-b. 

 1850. Goniatites crenistria, F. A. Roemer, Palwontographica, Vol. Ill, p. 51, PI. VIII, 



figs. 13a-c. 

 1852. Goniatites crenistria, F. A. Roemer, Palseontographica, Vol. Ill, \). 93, PI. 



XIII, figs. 29a-c. 

 1852. Aganides sphsericusv&v^ crenistria, F. McCoy, Brit. Pal. Fossils, p. 567. 

 1870. Goniatites sjjh^ricus (not Martin), F. Roemer, (xeol. Oberschlesien, p. 55, 



PI. VI, figs. 2a-b. 



1880. Goniatites striat us {par^i), L. (>. dcKoninck, Faune calc. carbon, de la Belgique, 



Vol. I, p. 253. 

 1882. Goniatites crenistria, C. Barrois, Mem. Soc. Geol. du Nord, Vol. II, No. 1. p. 

 292, PI. XIV, fig. 1. 



1881. GJy2}hioceras crenistria, A. Hyatt, Proc. Boston Soc. Nat. Hist., Vol. XXII, 



p. 329. 

 1893. Glirphioceras incisum, A. Hyatt, Fourth Ann. Rept. Geol. Surv. Texas, p. 471. 



' PL XLVII, figs. 11-48. 

 1897. GJyphioceras crenistria, Foord and Crick, Catal. Foss. Ceph. Brit. Mus., 



Pt. Ill, p. 160, tig. 76. 



1897. GlypJdoceras incisum, J. P. Smith, Proc. Cal. Acad. Sci., 3d series. Geology, 



Vol. I, No. 3, p. Ill, Pis. XIII-XV. 



1898. Goniatites a'enistria, E. Haug, Etudes sur les Goniatites, p. 27. 



1898. GhjpMoceras crenistria, G. C. Crick, Trans. Linn. Soc. Zool., 2d series. Vol. 

 VII, Pt. IV, p. 106, PI. XX, figs. 15-lS. 



This species has been united by many paleontologists with Goniatites 

 sphcericiis and by still others with G. striatus, and in fact all thi-ee species 



