Albert C. Eycleshymer and James Meredith Wilson 159 
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ABBREVIATIONS. 
a. g., appendicular gut. a. O., adhesive organ. 
a. v., auditory vesicle. bl., blastopore. 
b. c., brain cavity. c.. coelom. 
ch., chorda. d. ec., deep ectoblast. 
d. 1., dorsal lip of blastopore. env., envelope. 
f. b., fore-brain. f. g., fore-gut. 
@9., ut. _ g. c., gastral cavity. 
g. d., gut diverticulum. g. hy., gut hypoblast. 
h., anlage of head. h. b., hind-brain. 
hceh., hypochorda. ht., heart. 
m. b., mid-brain. m. en., mes-entoblast. 
mes., mesoblast. n., Nasal pit. 
n. C., neural canal. n. t., neural trench. 
op. t., optic thickenings. oO. v., optic vesicle. 
p. cb., pre-cerebral mass. p. d., pronephric duct. 
Ss. c., segmentation cavity. Ss. ec., Superficial ectoblast. 
v. a., visceral arch. v. C., visceral cleft. 
v. l., ventral lip of blastopore. y. m., yolk mass. 
EXPLANATION OF PLATES. 
PLATE I. 
Fic. 1. Profile view of egg about nine hours after fertilization. 
Fic. 2. Profile view of egg about twelve hours after fertilization. 
Fic. 3. Profile view of egg about twenty hours after fertilization. 
Fic. 4. Profile view of egg about forty hours after fertilization. 
Fic. 5. Profile view of egg about fifty-three hours after fertilization, anlage 
of embryo faintly outlined. 
Fic. 6. Profile view of egg about fifty-five hours after fertilization, outline 
of embryo discernible. 
Fic. 7. Same egg viewed from the lower pole, showing infolded blastodisc. 
Fic. 8. Embryo about sixty hours after fertilization, viewed from above, 
embryo well defined posteriorly, neural (?) trench visible. 
Fic. 9. Embryo about sixty-five hours after fertilization, viewed from above, 
embryo narrower, better defined outline, blastopore nearly closed. 
