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DR. E. B. WILSON ON THE DEVELOPMENT OF RENILLA. 811 
94. Blastula, with distinct segmentation cavity. One of the spheres, a, is 
apparently undergoing a delamination cleavage. X 85. 
95. Egg in resting stage with unsegmented central mass. x 190. 
PLATE 55. 
96. In this embryo the inner ends of the spheres are separating or have just 
separated from the outer portion. 190. 
97. Delamination completed. x 145. 
98. Unsegmented egg or one in the act of division. To show vertical 
amphiasters. X85. 
99. Section through an egg in which the delamination is partially accomplished 
but is in progress in the cells a and b. The section is incomplete below 
but complete above. X85. 
100. Later stage; the last to show delamination still in progress. The section is 
complete above and below but incomplete on the sides. 85. 
100%, 100°, 100% Three larvze of about twelve hours to show irregularity in 
form. X65. 
101, Free-swimming larva of about twenty-four hours. 45. 
102. A slightly older larva under compression, showing septa. The ventro- 
lateral septa could not be followed up to the peduncular septum as it 
ordinarily can. X45. 
108. Larva of about three and a-half days’ showing septa and buds, Dorsal 
view. X45. 
104. The same larva, from left side. x 45. 
105. Same specimen shown in figs. 103 and 104 in a state of strong contraction. 
x 45. 
106. Leptogorgia. Same embryo shown in figs. 77 to 85, ten minutes later than 
fig, 85. X70. 
107. Another specimen two hours later in the irregular stage. X 70. 
108, The same specimen twenty hours later, X70, 
109, Leptogorgia two days old. X70. 
PLATE 56. 
110. The same, three days. 110. 
111. The same as last under compression showing ectoderm and stomodeum, st. 
<eLELOS 
112. The same, four days old. 110. 
113. The same, eight days; recently attached to bottom, 50. 
114. Two larve united together. x 50. 
