REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



53 



and on September 26th, are here given in millimeters (1 mm. 

 — *V °f an inch). 



TABLE No. 4. 

 Dorso-ventral diameter (hinge to edge of shell). 

 Aus:. 20. 



Xo. 1 23.5 mm. 



" 2 17.5 " 



" 3 15.0 " 



" 4 19.0 " 



" 5 19.0 " 



" 6 21.5 " 



Antero-posterior diameter (length). 



No. 1 27.0 mm. 



" 2 18.5 



" 3 16.0 



" 4 20.5 



" 5 21.0 



" 23.0 



Lateral diameter in thickest part, 



Xo. 1 13.5 mm. 



" 2 9.0 " 



" 3 8.0 " 



" 4 10.0 " 



" 5 11.0 " 



" 6 11.5 " 



Analysis of these figures shows that the average growth per 

 animal in the dorso-ventral direction was 2.5 mm., and in length 

 3.75 mm., for the five weeks between August 20th and September 

 26th. This would permit an average weekly growth of 0.5 mm. in 

 breadth and 0.75 mm. in length. These particular quahaugs were 

 placed under favorable conditions. They were kept in a car in the 

 house-boat float, where they were covered with water continu- 

 ously, and thus assured a food supply as abundant as possible. 

 Unfortunately they were lost about the first of October, so that 

 no further data concerning- their growth is obtainable. 



