1918 AMMONITES < I EVELANDICUS 109c 



The decay of rostration is presumably catagenetic, but in this case 

 occurs while ribs are strong. In other Ainalthei rostration is — t: ill 

 pronounced after ribs have given pla< « to smoothlK I I paration 



of lineages of AmaWuus on these lines may hereaitei be possible and 

 desirable. 



Geological position : Simpson (iNK-j, xvii) gives Mid. Lias i with 

 Am. niUscens, that is, algovianUm zone. 



Result 



AllALTHEUS CLEVE1 WDKis, Youkg & Bird ip., [822, Domerian, 

 algovianum /one, Hawsker, near Whitby, Yorkshire. 



Comparable Species 

 118 46 18 24 

 F. 72, 47, — , 21, Amaltheus margaritatus ; Wright, 1882, LVI. 15. 

 See also p. 25d and Appendix, p. C. 



