XIII 



EXTENSIONS OF DARWINISM 269 



105), while others, as Professor Judd remarks (in a letter), 

 " before finally disappearing, twisted and. untwisted them- 

 selves, and as it were wriggled themselves into extraordinary 



Fig. 103. — Macroscaphites ivanii. Cretaceous. 



Fig. 104. — Hamites rotundus. Cretaceous. 



Fig. 105. — Ptychoceras emericianum. Cretaceous. 



Fig. 106. — Ancyloceras matheronianum. Gault. 

 Late Ammonites. (From Nicholson's Palaeontology.) 



shapes, in the last throes of dissolution." These strange 

 forms (Figs. 96-106) are reproduced from Nicholson's 

 Palaeontology, and there are many others. 



