PLATE 19. 



Fig. 1. 95. 4. Endoceras gemelliparttm. (P^g- 60.) 



1 a. External view of the fragment. 



1 b. Transverse section of the smaller extremity, showing llie siphuncle tube wliich joins the external margin ; 



within which are shown sections of the two embryo tubes. 

 1 c. Longitudinal section of the specimen, d and c being the two enclosed t\ibes, one of them iiartially covered 



with stony matter. 



