GONIATITES. 77 



GONIATITES KENTUCKIENSIS ]\Iiller. 

 PI. XVII, fig. 1. 



1S89. GontiititeK ki'ntucl'IcniiiK, S. A. Miller, Is'orth Aiiioriciiii (rcol. and Pul., p. 44U, 



lig. 740. 

 1896. Gonliititcf! keiifdcly'emt'i^, Miller and Gurley, Bull. Illinois State Mus. Nat. 



Hist. No. 11. p. 40, PI. V, fig. 1. 



This species is probably identical with G. striutus .Sowerb}-, and thus 

 with Ghiphioceras cumminsi Hyatt, for the globose rather flattened form, the 

 size of the unibilicns, the septa iuul the spiral ridges all agree with that 

 species. But jMiller does not describe nor figure an}- constrictions on the 

 shell, although it probably has them in the earlier stages. 



Occurrence. — Lower Carboniferous, St. Louis stage, Crab Orchard, Ky. 

 The type is deposited in the paleontologic collection, Walker Museum, 

 University of Chicago. 



G0NI.A.TITES LUNATUS Miller and Gurley. 



PL VI, figs. 2-5. 



1896. Goniatites lunatw, ISIiller and Gurley. Bull. Illinois State Mus. Nat. Hist. 

 No. 11, p. 41. ri. V, fio-s. 2-.5. 



Shell globose, volutions enlarging rapidly, and becoming more broadly 

 rounded with increasing size. Cross section, of the whorl semilunular. 

 Greatest breadth of whorl about one-fourth larger than the height, and 

 situated at a point about one-fifth of the height of the whoi'l above the 

 umbilicus. Whorls deeply embracing, the last whorl being indented to 

 one-half of its height by the preceding one. Umbilicus very narrow, being 

 not more than one-eighth of the total diameter. Surface of the shell 

 smooth, except for fine cross imbricating strife of growth. No constrictions 

 have been observed. 



Septa consisting of a narrow divided ventral lobe and broad, shallow, 

 bluntly pointed laterals. External saddles rather narrow, lateral saddles 

 broad and shallow. Dorsal septa unknown. 



In this species is seen the survival of a type that j)revailed in the St. 

 Louis-Chester stage of the Lower Carboniferous, but it has apparently 

 lost the constrictions and tendency to surface ornamentation characteristic 

 of the group at that time. 



Occurrence. — Coal Measures (Middle?), Elkhorn Creek, Kentucky. 



