CASTLE, — Ciona intestinalis, 
PLATE XIII. 
Magnification of all Figures, 560 diameters. 
Figs. 99-105. Seven sections from a series through an embryo with completely 
closed blastopore. Figs. 99-101, posterior to region of final elosure 
of blastopore; Figs. 103-105, anterior to region of closure of 
blastopore. 
Fig. 106. Cross section through an early larval stage (unhatched). The trunk 
region is shown in the left portion of the Figure, the tail region in 
the right portion. 
