Pago. 

 Vlg. 1. TliACHYCERASJUDICAIilCUM 118 



1. A peripheral or ventral viow of an iniporfoct specimen. 

 1 a. A side view of same. 



Fig. 2. TitACHYCKRAS JUDICARICUM, VUr. SUBASPKRUM 118 



2. A side view of an imperfect specimen. 



'2 a. A peripheral or abdominal view of same. 

 2h. A view of the lobes and sinuses of the septa. 



Fip. X TRACnVCERAS WniTNEYI 116 



;?. A peripheral or abdominal view of an imperfect s;>ecimcn. 



3 a. Side view of same. 



Ki^. 1. Et'DiscocERAsGAisni 1:28 



4. Side view of an imperfect specimen. 



4 n. A peripheral or abdominal view of same. 



V'lji. 5. ACROCHORDISCERAS HYATTI l--! 



5. Side view of a broken and somewhat distorted specimen. 

 5(T. A side view of a larger imperfect specimen. 



Fig. (!. Gymnotoceras Br.AKEi 11^! 



(■). Side view of a nearly complete adult specimen apparently of this species. 

 60. A peripheral or abdominal viow of same, showing the remarkable flattening of 

 the i)eriphery. 



Fig. 7. AncKSTES f PEKPI^NUS lyo 



7. Side view of a east, showing no surface-markings. 



7 ri. A protilo view, showing the strongly-eunipressed form of the shell. 



