PLATE XXII 



STAGES OF GROWTH IN SILURIAN BRACHIOPODA 

 (Page :312) 



Series of the sliells of Dalmanella elegantula, Orthotheles mhplanus, Rhyn- 

 chotreta cuneata, and Homoeospira ecux, from the youngest form observed 

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

 from a jDhotograph, and serves to show, not the details of structui-e, but 

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

 basis of this work. 



