clxxvi 



INFERIOR OOLITE AMMONITES. 



Note. — The example which I have figured has great resemblance to Haug's 

 type, both in general proportion and in manner of costation. It only differs in 

 degree of costation, being more strongly ribbed, especially in the umbilical whorls. 



9. Dumoetieria sp. Plate XLV, figs. 15, K>. 



1891. Dumortieea Levesquei, This Monogr., p. 241, 1892, PI. xlv, figs. 15, 16. 



Renin vis. — Not much can be said about this fragment. The umbilicus is not 

 large enough for A. Levesquei (d'Orbigny). It seems to have some likeness to 

 IK Munieri. 



I'nvcicostate to Costate. 

 The inner whorls show more or less of the paucicostate or IK prisca stage, but 

 the costate stage and decline of that stage are the chief characters in this series of 

 species. 



10. Dumortiekia MULTicosTATA, 8. Buckman. Suppl., Fig. 108 ill text. 



\ 



Fig. 168. — Dumortieria muUicostata. 



Description. — Subplatyleptogyral, hit-, almost perlatumbilicate, densiseptate ; 

 subbrevi-subangustilobate ; subpaucicostate to costate ; periphery subtabulate, 

 parvicarinate. 



Remarks. — The D. prisca stage is evident in the inner whorls. The later 

 development is much more definitely costate than in I), novata. Quenstedt figured 



