276 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
PLATE XCVII. 
Figs. 71 (D),72 (D) (same series as Figs. 66-70). Series of transverse sections through embryo of 35 
hours. 
Figs. 73 (D), 74 (F), 75 (D), 76 (F), 77 (F), 78 (D), 70 (D). Series of transverse sections through em- 
bryo of 39 hours. 
Fig. 80. Transverse section through optic sac of embryo, 39 hours. D. 4. 
Fig. 81. Ectoderm of embryo, 39 hours. F. 4. 
PLATE XCVIIl. 
Transverse section through embryo, 41 hours, in region of Kupffer’s vesicle. D. 4. 
Median longitudinal section through head end of embryo, 45 hours. C. 4. 
Median longitudinal section through tail end of embryo, 45 hours. D. 4. 
Longitudinal section to one side of median line through embryo, 45 hours. C. 4. 
One of posterior somites of Fig. 85. F. 4. 
One of anterior somites of Fig. 85. F. 4. 
(D), 90 (D), 91 (F). Series of transverse sections through embryo of 45 hours. 
Transverse section through region of Kupffer’s vesicle of embryo slightly more advanced than 
Fig. 88. D. 4. 
PLATE XCIX. 
Figs. 92 (F), 93 (F), 94 (D), 95 (D), 96(D), 97 (D), from same series as Figs. 88-91. Transverse sec- 
tions through embryo, 45 hours. D. 4. 
Fig. 98. Surface view of tail end of embryo, from below, 49^ hours. — t. f. (tail fold), marks line along 
which the ectoderm covering the tail bends round over the yolk. D. 4, 
Figs. 99 (D), 100 (D). Transverse sections through embryo of 49^ hours. 
PLATE C. 
Figs. 101 (D), 102 (D), 103 (F), 104 (F), 105 (D), 106 (D), 107 (F), 108 (D), from same series as Figs. 99 
and 100. Series of transverse sections through embryo of 49^ hours. 
Fig. 109. Transverse section through tail end of embryo, 53 hours. D. 4. 
PLATE Cl. 
Fig. 110. Transverse section through trunk of embryo, 53 hours. F. 4. 
Fig. 111. Transverse section through tail of embryo, ,59 hours. D. 4. 
Fig. 112. Ventral portion of a section similar to Fig. 111. F. 4. 
Figs. 113 (D), 114 (D), 115 (D), 116 (F). Series of transverse sections through embryo of 59 hours. 
PLATE CII. 
Fig. 117 (D), belongs to same series as Figs. 113 — 118, through embryo of 59 hours. 
Fig. 118. Transverse section through eye of embryo, 59 hours. D. 4. 
Fig. 119. Transverse section through tail of embryo, 65 hours. D. 4. 
Fig. 120. Transverse section through 1st organ of lateral line, 65 hours. F. 4. 
Figs. 121, 122. Transverse sections through connecting strand of lateral line of 65- hour stage. F. 4. 
Fig. 123. Transverse section through cerebellar (?) folds and dorso-lateral sense tract of embryo, 65 
hours. D. 4. 
Fig. 124. Transverse section through eyes and infundibulum of 65-hour stage. D. 4. 
Fig. 126. Transverse section through posterior trunk of embryo, 75 hours. D. 4. 
Fig. 82. 
Fig. 83. 
Fig. 84. 
Fig. 85. 
Fig. 86. 
Fig. 87. 
Figs. 88 
Fig. 89. 
