80 CARBONIFEROUS AMMONOIDS OF AMERICA. 



GoNiATiTES sTRiATus Sowerby. 



PL X, figs. 1-11; PL XXVI, figs. G-13. 



1814. Aiiiiiionites sfriatjiis. J. Sowerby. Miii. Conchol., Vol. I, p. 115, PL LIII. fig. 1. 

 1825. Gojiiatites striatm, G. df Ilaaii, Mon. Amnion. etGon., p. 15'J. 

 1836. GonuAtitesstriatus, J. Phillips, Ceol. Yorkshire, Pt. II, p. 233, PI. XIX, figs. 1-3. 

 181:2-181:-1. Ammonites strtatas (pars). L. G. de Konint'k, Descr. anini. foss., p. 568, 



PL XLIX. figs. T, a, b, c, d; PL L. figs. 7, a, b. <■. 

 1841:. Gonlatites strixttus, F. McCo)-, Synop. (^arli. Foss. Ireland, p. 16. 

 1852-1854. Gomatiten sphxTlexm (pars), F. Roemer, in Lethjea Geognostica, 3d ed.. 



Vol. I, Pt. II. p. 517, PL I, fi^-s. 17, a. b, c. 

 1855. Agujiidcs sphiericm, var. ;' .^f/'/atus, F. McCoy, Brit. Pal. Fossils, p. 567. 

 1876. Goniati.tes spkiericun, F. Roemer, Letha^a Geognostica, Pt. II. Lethsea Pahvo- 



zoica, PL XLVI, figs. 11, a, b, c. 

 18S(>. (rdniiUitcs stj'kitn.-i (pars), L. G. de Koninck, Faune calc. carbon, de la Belgique, 



Vol. I, p. 253, PL XLVI, figs. 1, la, 2, 2a; PL XLVII, figs. 1, la. 2, 2a. 

 18S4. Ghjpliiocemx sfriatimt, A. Hyatt, Proc. Boston Soc. Nat. Hist., Vol. XXII, 



p. 320. 

 1893. Glyphlocerm cu iinii 1 11^1 ^ A. Hyatt, Fourth Ann. Rept. CJeol. Surv. Texas, p. 467. 



PL XLVII, figs. 33-43. " 

 I8',t7. Gh/phioci'vasiitriutuiii^ Foord and Crick, Catal. Foss. Ceph. P)rit. Mus., Pt. Ill, 



p. 166, fig. 78. 



1898. Giiui(it!f('i< iftriatHs, E. Hang, Etudes sur les (roniatites, p. 28. 



1899. Ghjphioceras sfrlnfiiiii, F. Freeh, Die Steinkohlenforniation, PL XLM.^1 



figs. 1-2. 



Shell globose, involute, with slightly flattened sides, and broadly 

 rounded abdomen. Height of whorl about the same as the breadth, and a 

 little more than one-half of the diameter. Whorl indented more than half 

 its height by the preceding whorl. Umbilicus narrow, about one-eighth ol 

 the diameter, broader than in (}. cremstria, and narrower than in <i. splucr- 

 icus. Three to four distinct constrictions to a revolution; these form a 

 broad, shallow saddle on the abdomen, showing on both shell and cast. 



Surface ornamented with fine, sharp, spiral strise, with slighth* broader 

 interspaces, and fine cross stria?, giving a reticulated aspect to the shell. 

 The cross striae are finely crenulated, as in G. crenistria, but the spiral 

 ridges much stronger. G. striatus is most nearly allied to G. crenistria, 

 from which it differs in being shghtly more compressed, in its coarser spiral 

 stria? and less distinct cross striae, and somewhat wide umbilicus. From 

 G. sphcericus this species differs in its more distinct spiral and cross striae, 

 the slight reticulation of the shell, the somewhat narrower umbilicus, and 

 the greater lateral compression. 



