3 
I'liDliigiupheil liy (iixlt'ivy Biiigk'y, Hfiulingk-y, Lt-uds. 
Figs. 1, la. Olcostephaaus {Pohiptychites) hidkhotomua Leyin. D.; base. 17821. ■ 
„ 2, 2a. ( ) pobjptiichus Keys. D2 base. 17822. 
„ 3, 3a. ( ) cf. KentierUwji Neum. & Uhl. D2 base. 17823. 
Scale ^..t 
*Tlio numbers refer to tlio nuuiburs of these specimens in tlie Citt;ilogue of tlie (leological Museum, .lermyii Street, 
t Owing to a sliglit reduction in the making of the blocks in this and tlie following plates the figures represent- 
ing the size of the specimens shouM b.' sdiaewliat reduced. 
Proc. York-s. G'eoL Sor., IV. A' 1 7., /'/ate X. 
