FORBES ON BOGOTA FOSSILS. 



175 



a. Side view, the outline completed by a dotted line. 



b. View of the back, to show the form of the septa. 



2. ? Hamites Degenhardtii Von Buch. 1. c. f. 23, 24, 25. 



3. Hamites D* Orbignyana. Nov. sp. 



4. 



5. 

 6. 



7. 

 S. 



H. testa tereti, transversim sulcata ; sw/m numerosissimis, cequalibus, regit- 

 laribus • interstitiis elevatis, angustioribus, acutiusculis. 



Length of anterior portion • 

 posterior portion 

 Breadth of widest part 



1-^5 unc. 

 1 4 

 o 4 



Of this Hamite there is a single specimen which exhibits most of the 

 essential parts of the shell. It is cylindrical and tapering ; the oral extre- 

 mity appears to have been somewhat inflated. The surface is furrowed by 

 numerous transverse sulcations, which are continuous to the back, though 

 not in all cases equal ; they are separated from each other by somewhat 

 acute ribs. The shell bends with a sudden curve, and is then produced 

 into a rapidly diminishing posterior extremity, running nearly straight and 

 parallel with the oral portion. 



Ammonites Dumasianus D'Orbigny, 1. c. p. 69. t. ii. f. 1 — 2. 

 galeatus Von Buch. 1. c. pi. 2. f. 20. 



Alexandrinus ? D'Orbigny, p. 75. pi. xvii. f. 8 — II, 



... 



Vanuxemensis Lea ? pi. viii. f. 5. 



Rhotomagensis Sow. (Noticed also in the memoir by M. Von 



Buch.) 



