144 
BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
ABBREVIATIONS. 
For explanation of the letters and exponents designating blastomeres, see 
explanation of the nomenclature of cleavage (pp. 74-76). 
ast’cel, 
app. 
at}. 
at 2, 
bl’po. 
b’drm. 
cav.sg. 
cl.pol 1, 
cl.pol 2, 
d. 
Astroceel. 
Appendage. 
First antenna. 
Second antenna. 
Blastopore. 
Blastoderm. 
Cleavage cavity. 
First polar cell. 
Second polar cell. 
Dorsal. 
ec’bl. 
en’ bl. 
lbr. 
mb.vt. 
md. 
ms’bl. 
ms’ bl!. 
pr’nl. & 
prnl. 2 
Ketoblast. 
Entoblast. 
Labrum. 
Vitelline membrane. 
Mandible. 
Mesoblast of double origin. 
* Secondary mesoblast ” (ecto- 
blastic mesoblast). 
Male pronucleus. 
Female pronucleus. 
The Roman numerals I. II. (Figs. 28, 30) indicate the position of the first and 
second cleavage planes, respectively ; the Arabic numerals 1-4 (Figs. 91, 93, 122- 
126), the sequence in which the transverse furrows marking off the Nauplius 
appendages make their appearance. 
Plate 
Plate 
Plate 
Plate 
Plate 
Plate 
OarPOANH 
Figs. 1-16. 
Figs. 17-22. 
Figs. 25-30. 
Figs. 31-88. 
Figs. 39-46. 
Figs. 47-55. 
Plate 7. 
Plate 8. 
Plate 9. 
Plate 10. 
Plate 11. 
Plate 12. 
Figs. 56-65. 
Figs. 66-73. 
Figs. 74-86. 
Figs. 87-94. 
Figs. 95-110. 
Figs. 111-126. 
