394 



[May 1, 



11. 



Ammonites Inca. 



a. View of the side, showing the shell and the septa. 



b. View showing the lobes of the septa. 



face of the shell was finely, though irregularly, striated in an undulated 

 manner, indicating fine lines of growth. The sides of the umbilicus are 

 steep ; the mouth is lunate, and broader than long. 



The sutures of the chambers are well seen on a small specimen. The 

 lateral lobes, of which four appear on the lateral portion of the outer whorl, 

 are bilobate and pinnate, the pinna being denticulate. The dorsal lobe is 

 short, linguiform, and denticulate at the sides. 



Nearly allied to Ammonites latidorsatus Michelin, a gault species. Be- 

 longs to the section Ligati. 



Ammonites Buchiana. Nov. sp. 



a. Side view. 

 h. View of the back. 

 A. testa, subdepressd, suhumbilicatd,involutd, dorso rotundaio, costis transversis 

 numerosissimis subundulatis, ad lateras obsoletis j circa umbilicum Icevigatd. 



Aperturd lunata. Septis 



Med. semi-diam. Ifg unc. Crass. 1^ unc. 

 The Am.monites Buchiana is a very beautiful species. The outer whorl 

 almost completely envelopes the others, so as to leave only a small but deep 



