No. 387.] DESMOGNATHUS FUSCA. 239 
development shown by e, I cannot tell, but suppose it to be 
24-48 hours. 
Stage f, June 1. (Fig. 17.) Embryos move in eggs when 
disturbed. 
Stage g, June 6. (Fig. 18.) For this stage I have the follow- 
ing memorandum: ‘“ When taken out of egg membranes, swim 
about in watch crystal very vigorously for a few seconds and 
Fic. 13. Fic. 17. Fic. 18. 
Fics. 5-19. — Developmental Stages of Spelerpes bilineatus. 
repeat this each time when touched. Dorsal surfaces show 
pigment, light grayish appearance. Under lens, minutely 
mottled with pale gray dots (pigment cells), 6-7 little squarish 
areas left unpigmented in double row along back. These are 
to be the characteristic light spots of the larvæ.” 5-7 days 
after reaching this stage the larvæ hatched. In the first case 
observed, June 11, the eggs broke when extracted from the 
water and liberated the larve. A note as follows: “It had to 
be caught with the little net; it swam about rapidly from one 
