1928 



TYPE AMMONITES— VII 



DCCLXX1 h 



Fig. 2x3 



Fig. 1x0-9 



Ammonites ziphus 

 (Cf. Reynes, Mon. Amm., 1879, xxxvn, 17, 18) ; Lyme Regis 



Dorset ; Lower Lias, [planicosta bed] ; S.B. Coll. 4454, purch. 

 Stages, 1 to c. 4, 4 to c. 8, 5 to c. 58 mm. ; then decline 'reverse) 

 Ribs of ultimate whorl very feebly bullate 



XIPHEROCERAS REVERTENS, n 

 Asteroceratan, planicosta ; Holotype. See DO \ 1 



