PLATE XLIX. 



Zone of Aegoceras angulatum. 



Fig. 1. Aegoceras laqueolus, Schloenbach. Side view, natural size. Obtained by the 



late Mr. Lamley from the Lower Lias at 

 Halford, between Stratford-on-Avon and 

 Shipston-on-Stour, and presented by him 

 to the Warwick Museum. Kindly com- 

 municated by Robert Tomes, Esq., E.G.S. 



Zone of Amaltheus margaritatus. 



4. Harpoceras nitescens, Young and Bird. Side view, magnified two diameters. 



Marlstone. My collection. 



5. — — — View of siphonal area, showing the 



siphuncle below the keel of the 

 shell. My collection. 

 3. — — — Lobe-line of the same shell, magni- 



fied. 



6. — Another specimen, natural size. 



7. — — — Siphonal area. My collection. 



o 



Lobe-line of the same, magnified. 





