EHYLUS ROTUNDUS. 



307 



tion of smooth discs with more or less continuous margin (Phate 7, fio-s. 22 23) 

 On the whole of the surface, the margin as well as the faces, of the disc small 

 excrescences then make their appearance, and these grow out to form the pro- 

 tuberances above described. 



LOCALITIES AND NATURE OF ENVIRONMENT. 



VAR. MEG.\RHABDA LENDKNFELD. 



VAR. TTPICA LENDBNFELD. 



VAR. CIDARI9 LICNDENFELD. 



