78 CARBONIFEROUS AMMONOIDS OF AMERICA. 



Deposited in the paleontologic collection in Walker Museum, University 

 of Chicago. The writer's thanks are due Dr. Stuart Weller for the use of 

 the drawings of this species, from Bull. No. 11, Illinois State Mus. Nat. 

 Hist, PI. V, tigs. 2-5. 



GONIATITKS NEWSOMI Smith, Sp. UOV. 



PI. XVII, figs. 2-5. 



"Whorl depressed, with broadly rounded abdomen, and angular umbili- 

 cal shoulders. Whorl a little wider than high, greatest breadth a little 

 above the middle, indented to half its height by the preceding whorl. 

 Involute, umbilicus rather wide, about one-fourth of diameter of sliell; 

 narrower in young. Several sharply incised constrictions to a revolution 

 showing on both shell and cast. These bend sharply forward on the 

 abdomen, makiiig a broad saddle, with a narrower lobe. Shell ornamented 

 with strong spiral striae or ridges, witli broader interspaces coarser than on 

 G. striatus. There are also fine cross strije of growth, giving a slightly 

 reticulated aspect to the shell and the cast. These show on both sliell and 

 cast. The ornamentation resembles G. striatus, but is coarser, and the fiirm 

 is somewhat more strongly compressed than that species, from which it 

 also difiers in the form of the constrictions and in its wider umbilicus. 

 Tlie nearest relative of this-species is G. suhcircularis Miller, but G. newsomi 

 is much broader than G. subcircularis, has coarser spiral ridges, and wider 

 umbilicus. The septa are more larval in character than those of G. striatus. 

 Named in honor of the collector, J. F. Newsom. Deposited in the geologic 

 collection of Leland Stanford Junior University, California. 



Occurrence. — Lower Carboniferous, St. Louis stage, so-called Fayette- 

 ville shale, Batesville, Indei)endence County, Ark. 



GoNiATiTES sPH.ERicus Martin. 



1S09. ConehyUollthm N'Mtlliten uplixrlcm^ W. Martin, Petrif. Derb., p. 15, PL VII, 



%s. 3, 4, 5. 

 1814. Ammonites sphmrlcus, J. Sowerby, Mhi. Conchol., Vol. I, p. 116, PI. LIII, fig. 2. 

 1825. Goviatites sphmricus, G. do Haan, Mon. Ammon. et Gon., p. 159. 

 1828. Orlidlta sphserica, J. Fleming, Hist. Brit. Anini.,p. 248. 

 1832. Aiiunonltt's carhonariuii (pars), L. von Buch., Phys. Abhandl. Berlin Akad. der 



Wissenschaften for 1830, p. 176, PI. II, figs. 9, 9i, 9n, 9iu(not fig. 9iv). 

 1836. Gonmtitev .•^phxricm, J. Phillips, Geol. Yorkshire, Pt. II, p. 234, PI. XIX, 



tigs. 4-6. 



