EXPLANATION OF PLATE XIX. 



Fig. 



47. Belemnites longisulcatus. (Copied from Voltz's figure, ' Obser. sur les Belemn.,' 



pi. vi, fig. 1.) 



/. Lateral view. 

 d. Dorsal view. 

 V. Ventral view, 



48. Belemnites in^quistriatus. (Erom the Upper Lias of Whitby.) 



/. Lateral view of a specimen in the Whitby Museum, " No. 454." 



d. Dorsal aspect of the same. 



V. Ventral aspect of the same. 



v . Enlarged view of the tripartite end. 



Shows the oval contour of the alveolar region, the ventral area being 

 broadest. 



49. Belemnites sulci-stylus, n s. (From Xailsworth [Sands].) 



