[Annals N. Y. Academy of Sciencks, Vol. XX, Xo. 1, Part I, pp. 1-92, 

 Pll. l-IX. 14 May, 1910] 



THE PHYLOGENY OF CERTAIN CERITHIID^ 

 By Elvira Wood 



(Presented in abstract before the Academy, February 1 , 1910) 



CONTENTS 



Page 



I. Introduction 2 



General principles 2 



Acknowledgments <> 



II. Selection of a genotype for Cerithium sensu stricto - 6 



III. Genus Cerithium Columnje 10 



IV. Ontogenetic description of species 1-4 



A. Recent species 14 



1. Cerithitiin tuberosum group 14 



a. European species 14 



h. American species 30 



2. Genera and species related to the Cerithium tuberosum 



group 33 



VulfjoceritJiium 33 



B. Pleistocenic species of Vuh/occrithiuiii 39 



C. Pliocenic species of Cerithium 39 



D. Miocenic species 43 



1. Cerithium 43 



2. Vulf/ocerithium 46 



E. Oligocenic and Eocenic species 47 



1. Cerithium 47 



2. Viciiwcerith ium 57 



3. Potamidcs 59 



4. Potamiflopsis 65 



5. Vulfiocerith ium 77 



F. Cretacic species of Cerithium 79 



G. Jurassic species of Cerithium 80 



V. Summary 81 



VI. Phylogenetic table of certain Cerithiidje 85 



Note. The author alone is responsible for the terminology used throughout this 

 article. Editor. 



