1922 



TYPE AMMOMTES—IV 



CCCXXXII 



Fis. I 



Fig. 2 



" Ammonites (Perisphinttes) pseudomutabilis "' 



" Fleet Bridge, Weymouth, Dorset ; Oxford Clav " 



Geol. Surv. Engl. 6509 ; S. 55, ^^, 31, 37 ; max. c. 105 



Central whorls smooth ; outer, ribs triplicate, broken on venter 



TRIXISPHIXCTES TRIXUS, nov. 

 Kosmoceratan, atJiUia ; Genot\-pe, Holotype. Cf. CCLXI 



