No. 436.] REPRODUCTION OF REPTILES. 265 



it. The embryos show the characteristic dark cross bars across 

 the back, when only about half hatched. The number of eggs 

 laid in one lot is from ten to fifteen. One rather curious fact in 

 connection with this species and the next is that the eggs 



tively long and slender, but as the embryo develops the eggs 



very slim and narrow eggs of this species were brought to me ; I 

 preserved one and kept the other three in dry earth in a corked 

 bottle ; on July 23, the eggs had materially increased in size and 

 a second egg was preserved, on Aug. 1 1 a third egg was put up ; 

 on Aug. 23, the remaining egg was still unhatched, but the skin 

 had become loose and flabby, on Sept. 3, the next time I looked, 

 a young lizard had hatched out, 67 days after the eggs were 

 brought to me (the egg, however, probably hatched a day or two 

 after Aug. 23). 



The eggs of ( 'ucmidophorits scxlincatns are similar in general 

 appearance to those of .V. nndulatus, but somewhat larger (about 



to which dirt does^not adhere so readily as to the rough skin of 

 the Sceloporus eggs, and hence they usually look much whiter. 



before hatching. On July 8, 1901, three small white eggs 

 which from their size (9A mm. long) could only belong to the 

 Ground Lizard {Lciohpis ma latcralc ) and which contained lacer- 

 tilian embryos were brought to me. anil another lot of three sim- 

 ilar eggs on July 2, 1902, which were said to have been found in 



Of the Tesfudinata, the eggs most frequently brought in are 

 those of the little Mud Turtle {Kinosternon pennsylvanicum) ; 

 these are hard shelled usually rather blunt at the ends and vary- 

 ing from a rather short to a rather long oblong in shape, varying 



of Walnut Creek. Some of the larger eggs attributed to this 

 species may be those of Aromochclys odoratus the Musk Turtle. 



In preparing the shell of an adult Aromochclys tristycha (a 

 smaller species than A. odoratus or K. pcnsylvamcum) from 



