MUENSTP:K0CEK AS. 1 1 9 



MUENSTEROCERAS? MORGANENSE SwillloW. 



1S(>0. OoniatiU'K iii(ir</(()u>)iKlx^ Ci. V. S\v;illo\v, Trans. .St. Louis Af-ad. Sci., Vol. I, 

 p. ()5!l. 



Shell siihg-l()l)o.se, whorl deeply embvaciug, with abdomen and sides 

 regularly rounded. Height of the whorl is one-half of the width and a 

 little over one-fourth of the total diameter. Umbilicus narrow and deej), 

 funnel-shaped. Surface ornamented with three or four deep and broad 

 constrictions to a revolution. 



Ornirreiicc. — Lower Carboniferous, Kinderhook stage, Chout(\ui lime- 

 stone, Misst)uri. 



MuENSTEROCERAS OSAGENSE Swallow. 



PI. XXIV, figs. 8-12. 

 IStiO. Goniatiti's oxaijcmi--^. (x. C. SwalloM', Trans. St. Louis Acad. Sci.. Vol. I. p. 659. 



Shell discoidal, moderately convex, with broadly- rounded abdomen 

 and somewhat flattened sides. Whorls deeply embracing and deeply 

 indented by the inner volutions. The umbilicus is narrow and funnel- 

 shaped, exposing only the umbilical shoulders of the inner whorls. The 

 height of the wliorl is one-half of the total diameter of the shell, and the 

 width is equal to the height. The last whorl is indented to one-half its 

 height by the preceding volution. The umbilicus is one-sixth of the total 

 diameter. 



The surface of the cast is marked, on the last revolution, with six 

 deeply incised, sinuous constrictions, showing a narrow backward-pointing 

 sinus. 



The septa have a divided ventral lobe and a moderately deep lateral. 

 The lobes are all pointed, and the saddles are rounded. Swallow compared 

 this species with Glypkioceras micronotum Phillips, but the relationship is 

 not close. 



Occurrence. — Lower Carboniferous, Kinderhook stage, Cooper, Moni- 

 teau, and Pettis counties. Mo. The specimen figured in this paper is 

 deposited in the paleontologic collection of the Walker Museum, Uni- 

 versity of Chicago (No. 8602); it was found in the Chouteau limestone 

 of Pettis County, Mo., the more exact locality being unknown. The 

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



