148 



A. S. PEARSE. 



TABLE II. 



GROWTH OF TURTLES OF DIFFERENT LENGTHS. 



Table II. shows that a turtle nearly doubles its length and 

 weight during the second year of its life. After twelve years it 

 would be about 135 mm. long and the growth rate would have 

 decreased to about one thirtieth of that during the first two years. 

 An ordinary adult turtle measuring 150 mm. in length is, using 

 the data here presented as a basis for computation, about twenty- 

 five years of age (since the eggs from which it hatched were laid). 

 The largest turtle measured from Lake Mendota was 170 mm. 

 in length. It was perhaps fifty years of age. 



BIBLIOGRAPHY. 

 Agassiz, L. 



'57 North American Testudinata. Contr. Nat. Hist, of U. S., i : 233-452. The 



embryology- of the turtle. Ibid., 2: 451-643. 

 Barney, R. L. 



'22 Further Notes on the Natural History and Artificial Propagation of the 



Diamond-back Terrapin. Bull. U. S. Bu. Fisheries, 38: 91-111. 

 Coker, R. E. 



'20 The Diamond-back Terrapin: Past, Present, and Future. Sci. Mo., 



8: 171-186. 

 Ditmars, R. L. 



'07 The Reptile Book. N. Y., xxxii-472. 

 Lucas, F. A. 



'22 Historic Tortoises and Other Aged Animals. Nat. Hist., 22: 301-305. 

 Neuman, H. H. 



'06 The Habits of Certain Tortoises. J. Comp. Neurol. and Psychol., 16: 126- 



152. 

 Ruthven, A. G. 



'12 The Reptiles of Michigan. Mich. Geol. and Biol. Surv. Publ. 10, Biol. 

 Ser., 3: 63-166. 



