64 



Report of the State Geologist. 



The suture is not clearly displayed in the specimens examined, but enough 

 is shown to indicate that on the fourth whorl a distinctly manticoceran char- 

 acter has been assumed. Entire immature shells similar to that shown in our 

 figures have been seen in several instances, retaining the aperture unbroken 

 and showing the stomal callous and resorption of varices. 



The species occurs in the lower Portage shales of the Briggs gully, 

 Honeoye lake. 



Manticoceras simulator, Hall (sp). 



Plate I, fig. 14. 



1875 Goniatites simulator, Hall. Twenty-seventh Ann. Rept. N. Y. State 



Mus. Nat. Hist., p. 133 (also published separately in advance, 1874). 



1876 Gonmtites simulator, Hall. Illustr. Devon. Fossils, pi. lxix, figs. 1, 2. 

 1879 Goniatites simulator, Hall. Palaeontology of N. Y., vol. v, pt. 2, 



p. 453, pi. lxix, figs. 1.2; pi. Ixxiv, fig. 8. 

 Reference has already been made to the fact that this form, known only 

 from a single specimen, stands in a definite relation to the normal of Patter soni. 

 Its size indicates maturity, while its suture shows, in its rounded lateral lobe, 

 positive evidence of immaturity. This character is supplemented by the 

 whorl-section which is somewhat broader than in the normal ephebic type. 



It is from beds containing IAorhyinchu^ at or 

 near Ithaca, N. Y. 



This species is one which may be directly com- 

 pared with such European Intumescens-zone forms 

 as Gon. carinatus (Sandberger, not Beyrich), as 

 identified by Tschernyschew and by HoLZAPFEL.f 

 The typical carinatus, however, has actually cari- 

 nated whorls, but Holzapfel states that the shells 

 Fi R ure29. Manticoceras simulator . from Martenberrr (Westi >halia ) referred by him to 



Adult suture. . 



this species show evidence of the feature with ex- 

 treme rarity, and never clearly. This author lays principal emphasis on 

 the course of the suture as a distinguishing mark from Marttic. i/rti/t/us- 

 cens. If, however, we go back to Beyrich's original we find that the keel 

 is a well developed feature on the entire final whorl, or at least on what is 

 represented as such. The figured specimen is, also, quite small and closely 

 umbilicated. If the entire shell is not represented in this figure we should be 



• Fauna des mittl. und ober. Devon am West Abhange des Urals, pi. 2, figs, la-c, 1877. 

 t l'alicontographica, loc. cit., p. 242(18). 



