UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 1 1, No. 2, pp. 21-28 December 6, 1912 



ON THE STRUCTURE AND RELATIONSHIPS 

 OF DINOSPHAERA PALUSTRIS (Lemm.) 



BY 



CHARLES ATWOOD KOFOID and JOSEPHINE RIGDEN MICHENER 



In 1907 Lemmermann described from the plankton in the 

 ponds on the moors of Brandenburg a small spheroidal dinoflagel- 

 late which he called Gonyaulax palustris. His figures give a clear 

 analysis of the skeletal structure of the species and enable one to 

 establish its relationships. Not having seen material of this species 

 I included it provisionally in the list of species assigned by me to 

 the genus Gonyaulax in my monograph (1911a) allocating it in 

 non-fusiform group designated as the subgenus Gonyaulax. By 

 the kindness of Dr. Lemmermann, who has courteously placed his 

 type collection at my disposal, a reexamination of his species has 

 been possible with the result that it now seems necessary to ex- 

 clude the species from Gonyaulax and place it in a new genus 

 Dinosphaera. 



The skeletal morphology of the genus Gonyaulax as defined 

 by me (1911a) and of G. palustris as described by Lemmermann, 

 as here analysed by us, is summarized in the following table : 



