POLYODON SPAT HULA 

 Table I. 



filum Weight rosmraijeSg^h 



.7.87 .258 



.7.00 43 lbs. .253 



5.75 41 " .238 



Lake-fish. 

 Lake-fish. 

 Lake-fish. 



By means of the above proportion one may calculate approxi- 

 mately the size of a fish from a small drawing. To test this I 

 measured and calculated the proportion of length of rostrum to 

 length of body in the Polyodon figured in Jordan and Evermann's 

 PI. XX, figs. 43 and 43a; the proportion found was .327 which 

 according to the table would indicate that the specimen was about 

 twenty-five or twenty-six inches long. Calculating from the inch 

 line which accompanied the figure I found that the specimen was 

 27.2 inches in length, a very close agreement with my expectation. 



From a few comparisons made between fishes li\ing in the lakes 

 and those in the river, it appears that the river fish have shorter 

 and broader snouts in proportion to their entire IxmIv length than 

 those living in Lake ^^■ashington. 



the old -cut oil" lak.- .>f tli.- Mi^H.^ippi ]V^^rv. 'Hicx- cve.scent 

 nected only by a loii.^ cluiiu of bavons and lagoon.s. oftentimes. 



