192. 



T yPE A MMOM TES—I \ ' 



CCCXXII A 



Fig. la 



Fi-. I 



\'i- lb 



" Ammonites pygm.^us " 



" Burton Bradstock, Dorset ; I.O." jst bed" 



S.B., ex Darell, Coll, 3324 ; S. 28-5, 29, 20, 47-5 



Isochronous homoeomorph of Lxt. tripartitiim ; Roman, 1921, \ti, i 



POLYSPHINXTITES POLYSPHINXTUS, nov. 

 Zigzagiceratan, zigzag; Genotype, Holotype. Cf. CCCXXI 



