• .< 



PLATE 87. 



Fig. 1. 376. 1. Theca? TRiANOULAEis. (Pag. 313.) 



1 a. A portion of a Urge specimen, with the smaller extremity broken off. 1 c. Section of the same. 



1 4. A smaller specimen, very perfectly terminated at both extremities. 



1 d. A minute specimen of the same species. 



Fig. 2. 375. 2. Oemoceras csebriseptttm. (Pt^g* 313.) 



2 a. A part of the outer chamber of this species. 



2 A. A fragment still preserving a portion of the shell, showing some strong longitudinal stris, and the dorsal 



line or ridge. 



3 e. A fragment showing the position of the siphuncle on the highly arched septum at the upper extremity of 



the figure. 

 2 d. A fragment of stone, with numerous small specimens of this species, associated with crinoidal joints. 

 2 «. A longitudinal section of a fragment, showing the deeply arched septa, and the alternate enlargement and 

 contraction of the siphuncle. 

 ,*, These figures are all erroneously marked 4 on the plate. 



