AGANlDErt, MUENSTEKOCEKAS. 117 



]iin-tVctly presci-v('(l. it would show oightof theses nidiiitinji- fuii-ows. Surface between 

 the furrows showiny' traces of liner similarly sinuous liii(>s. Rody eiiaiiiber and 

 a])ertiire unknown. 



The sinuosities of thi^ septa, as near as they ean he deterniincd from our speci- 

 men, may be described as follows: Doi-sal [ventral] lobe lanceolate and pointed, supe- 

 rior lateral lobes lonji'er than the dorsal, and pointed at the extremities; doi'sal [ventral] 

 saddle sublinguiform, gradually nari'owinj^- and rounded at the extremity, lateral 

 saddles similar in outline, tiie three inferior lobes short, witiicorresponding saddles. 



Occurrence. — Lower Carboniferous, Osage stage, Upper Waverly, 

 Sciotoville, Oliio. 



Aganides ? SHUMARDIANUS Wincliell. 



1862. Goniatltes shumardian un, A. Winehell, Am. Jour. Sci. , 2d series. Vol. XXXIII, 



p. 364. 

 1870. Goniatltes shumardianun, A. Winehell, Proe. Am. Philos. Soc., Vol. XI, 



p. 258. 



Shell discoidal, involute, laterally compressed. Whorl liighly arched, 

 narrow, deeply embracing, lint showing a portion at" the inner whorls. 

 Umbilicus open, width nearly one-fourth of the total diameter. Height 

 of whorl nearly one-half of the total diameter and once and a half times 

 the height. 



Septa of the usual Aganides type. Ventral lobe simple, tongue-shaped, 

 pointed; lateral lobe wider and longer, also pointed; internal septa con- 

 sisting of a long, slender antisiphonal lobe, witli a pair of shorter laterals. 



Occurrence. — Lower Carboniferous, Kinderhook stage, Lo\\'er Waverly 

 group, Newark, Ohio. 



Genus Muenstekoceeas Hyatt. 



The genus Muensteroceras was established by Hyatt," with Goniatites 

 parallehts Hall as the type, to include evolute, compressed, discoidal forms, 

 with liiglih' arched whorls and moderately wide umbilicus. Tlie septa are 

 glyphioceran, and the most distinctive feature is the presence of an acute 

 second lateral lobe outside of the iimbilicus. 



The genus has usually been abandoned by later writers, being consid- 

 ered as a synonym of Goniatites de Haan or Glyphioccras Hyatt; indeed, it 

 is impossible to draw any line between these three groups, but the extremes 

 may be differentiated. 



"Proc. Boston Soc. Nat. Hist., Vol. XXII, p. 326. 



