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The growth of the shell in the lamellibranch 

 Dosinia discus (Eeeve). 



By 



W. J. Crozier. 



(Contributions from the Zoological Laboratory of the Museum of 

 Comparative Zoology at Harvard College, No. 250.) 



With Plate 35 and 4 flgnres in the text. 



Contents. 



Pages 



Introduction 577 



Material 578 



Measurements 579 



Discussion 580 



Summary 583 



Introduction. 



Statistical studies of the relative growth of the several dimensions 

 of the animal body have been carried on chiefly with reference to 

 vertebrates, and more particularly in the case of mammals. The 

 results thus far obtained are of considerable significance for the 

 theoretical interpretation of growth phenomena (cf. Hatai, 1911, 1913). 

 The present note is an attempt to extend these methods to the in- 

 vestigation of the growth of certain shell characters in a lamellibranch. 



