FORBES ON BOGOTA FOSSILS. 



177 



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 pinnse 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. 



b. View of the back. 



A. testa subdepressd, subumbilicatd, involutd, dorso rotundato, costis transversis 

 nnmerosissimis subundulatis, ad lateras obsoletis ; circa umbilicum laevigata. 



Aperturd lunata. Septis 



Med. semi-diam. 1 T 6 5 unc. Crass. l T 3 g unc. 

 The Ammonites Buchiana is a very beautiful species. The outer whorl 

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

 VOL. I. N 



