SOME NEW SPECIES OF AMMONITES. 



145 



The small specimen has the greater portion of the test preserved, 

 and also shews the mouth-border. 



Locality^ Ohorne, Dorset, where it is fairly common. 



Position, zone of Stephan. JItimphriesimmm. 



Nearest Allied Form. — Perisphindes Martinsii d'Orb. Our 

 species, however, differs from it in being far flatter, with 

 broader whorls and greater inclusion. 



[Dr. Wright, in the Journal of the Paleeontological Society 

 for 1880, figures on page 254 Periophinctes Martinsii with a 

 large amount of inclusion, but I cannot agree with it. If it is 

 compared with d'Orbigny's figure in Paleeont. Frangaise, plate 

 125, Cephalopodes, it will be seen to be very different.] 



Haepoceras Boweri fJ. B'uchmanj, woodcut figure in text. 

 Ammonites Boweei, J. Buckmau, M.S. 



1. — HAEPOCEEAS BOWEEI, natural size. 



Shell somewhat compressed ; whorls about one-half included ; 

 ornamentation, plain small slightly bent ribs, without bifurca- 

 tions ; mouth-border possesses two fine labial prolongations, and 

 is somewhat produced on the ventral area, in which respect it 

 differs from the mouth-borders of the genus StepJianoceras ; 

 ventral area ornamented with a very small keel which is not so 

 conspicuous on the body-chamber. 



