SEPTA OF AMMONITES BARNSTOTnI. 



313 



The superior lateral lobe is longer than the dorsal lobe, 

 but very irregularly branched, and, like it, provided with 



Front view of the same specimen. 



numerous sharp digitations on all its divisions ; at the 

 extremity it has three very unequal branches, the middle 

 one of which is much longer than the others, and very 

 slender ; the other two are small, unequal, opposite, and 

 diverging ;— that on the right being subdivided nearly to 

 its base : above these there are several other unequal 

 alternating lateral branches, one of which on the right 

 side is much larger than the others. The lateral saddle 

 is rather smaller than the dorsal, and divided at the ex- 

 tremity into two very unequal branches, of which the 



