PLATE XXII 



STAGES OF GROWTH IN SILURIAN BRACHIOPODA 



(PAGE 312) 



Series of the shells of Dalmanella elegantula, Orthothetes subplanus, Rhyn- 

 chotreta cuneata, and Homceospira evax, from the youngest form observed 

 up to the adult or senile condition. The plate was drawn on stone 

 from a photograph, and serves to show, not the details of structure, but 

 the character and completeness of the material which has served as the 

 basis of this work. 



V OF THE 



UNIVERSITY 



