. MUENSTEKOCEKAS. 121 



lateral saddle, and a sliort, pointed aiixiliai-\' loljc on tlie nmhilical shoulder; 

 the superior lateral saddle is deep, and tlie second is hrond and shallow. 

 The internal septa consist of a short, pointed antisiplional lobe and a ]>air 

 of similar laterals; the antisiplional saddle is narrow, nnd the interior lateral 

 is broadly rounded. 



This species is most nearly related to ^fneiisteroceras {(Hjiphioceras) 

 barroisi Holzapfel," of the Lower Carboniferous of Germany, but ditfers in 

 the backward-pointing curve of the constrictions, greater width of the 

 umbilicus, more depressed whorls, and greater approximation of the septa. 



The species is exceedingly variable in width of umbilicus, breadth of 

 whorls, and involution, so that it is possible that there are several distinct 

 but neai'ly related species included in this one. Prof A. Hyatt' proposed 

 the name Muensteroceras tvhitei for a specimen figured by Dr. C. A. White '' 

 luider the name of Goniafites oweni Hall. But since White's figure seems 

 to be mex'ely a copy of Hall's illustration of the type specimen, this name 

 becomes merely a synonym. In a large number of specimens examined 

 by the writer there was no constancy of characters that might justify a 

 separation into species or even varieties. 



Occurrence. — Muensteroceras oiveni is common in the Lower Carbonifer- 

 ous, Kinderhook stage, goniatite limestone of Rockford, Lid., associated 

 with JI. parallelum Hall, Prolecanites lyoni Meek and Worthen, Aganides 

 rotatorius de Koninck, Frodromites f/orbi/i Miller, P. pramaturus Smith and 

 Weller. All these are of distinctly European type, except Frodromites, 

 which is of unknown antecedents. M. oiveni has also been cited by Win- 

 cliell from the Kinderhook stage, Marshall group, of Michigan, and in 

 somewhat the same association as at Rockford, Ind. The illustrations on 

 PI. XIX, figs. 3-8, are copied from Hall's Paleontology of New York, 

 Vol. V, Pt. II, PI. LXXIII, figs. 3-8. 



Muensteroceras p.\kallelum Hall. 



PI. XVI, fig. 3; PL XIX, figs. 1, 2. 



1S60. Gnnkititea owenl var. pimdh-la^ J. Hall, Thirteenth Rept. New York State 

 Cab. Nat. Hist., p. KlO, tigs. 1?>. 14. 



"Pal. Abhandl., Vol. V, p. 30, pi. 1, figs. 10, lOa-b. 



fiProc. Baston Soc. Xat. Hist, Vol. XXII, p. 326. 



'■Second .Vnn. Rept. Ueol. Surv. Indiana, PI. VII, fig.s. .'i and 4. 



