SUPPLEMENT.— DUMORTIERIA. 



clxxiii 



2. Dumortieria novata, 8. Buchman. Suppl., Fig. 163 in text. 



1885. Ammonites falcofila. spaesicosta, Querist., Aram. Schwab. Jura, PI. liv. 



fig. 29 (not 35). 

 1895. Dumortieria prisca, Brazil, Opli. iiouv., Bull. Soc. Geol. Normandie, 



vol. xvi, PI. ii, fig. 3. 



Distinction. — From D. prisca, the costae in the early whorls arc less coarse and 

 less distant, the umbilicus is smaller, degenerative changes begin earlier. 



MJ^*' 



'4 





'NSt 



Description. — (Young) Subplatysubpachygyral, latumbilicate, paucicostate to 

 costate; (adult) subplatyleptogyral, perlatumbilicate, costate to laevigate ; sub- 

 pauciseptate, sublongi-subangustilobate ; periphery penetabulate, parvicarinate, 

 degenerating to convex, obsoleticarinatc. 



This seems to be one of the forms which Quenstedt called . [.falcofila sparsicosta ; 

 but Haug, considering that form as identical with a species he figured, used the 

 name sparsicosta for that species — his Dumortieria sparsicosta (</. v., p. 239). But 

 this form, Quenstedt' s fig. 29 of Plato LIV, has thicker whorls and a broader, more 

 convex, periphery than Hang's species. 



Localities and Simla. — Gloucestershire : rem) Wood, Qephalopod Bed, middle 

 ("Dumortieria Beds"), several young specimens; Wotton-under-Edge, similar 



