172 GUIDE TO THE FOSSIL INVERTEBEATE 
ANIMALS. 
!7 
Fia. 9G. — Uncoiled and Asymmetric Cretaceous Ammonoidea. a, Crioceras Evwrici, 
Neocomian. b, Heteroceras Emcriciamim, Neocomian. c, Tmrilites catenatus, 
Albian. d, Mdcroxcaphites Ivanii, Neocomian. c, llamites clcgans, Albian. 
/, Scaphites Hugardiann.s, Albian. g, liaciilites anccjts, Dauian. All less than 
natural size. 
