PLATE XIII. 
Fig. 1. Section through the hrain of Caloptcmts bitrittatut in the third larval stage, 
showing the two hemispheres or sides of the brain and the ocelli and ocellar 
nerves, which are seen to arise from the top of the hemispheres directly over 
the calicos (compare Plate ix, fig. — ) ; o. cat., outer calyx of left mushroom 
body. The lighter portions represent the granulo-fihrous central part of the 
hrain, and the dark the cortical ganglionic cells ; X i A. 
Fig. 2. The right hemisphere of fig. 1 magnified 225 diameters, showing the mush- 
room hody, its peduncle (p.), cauliculus (com.), and outer (o. cal.) and inner 
(t. cal.) calices, and the bundles of libers variously distributed to the optic 
and commissural lobes. 
Fig. 3. Section passing immediately in front of that represented in fig. 1, and show- 
ing the calices without the stalk, and the oesophageal commissural lobe and 
its commissure (com.); the two hemispheres are united below; separate in 
fig. 1. 
Fig. 4. Enlarged view ( x 400 diameters) of the central body and contiguous parts 
from section 11 of the older embryo of C. sprctus, represented in Plate xii, 
fig. 8, cent. b. and low. I. The central body is seen to be separated from 
the other parts by a partition of ganglion cells. Arc the four ganglion cells 
in the upper part the rudimentary cellular bodies? Only the right half of 
the central body is drawn. The right half of t he upper cerebral lobe is rep- 
resented (up. I.), and below the entire trabecula, as it appears to be. 
Fig. 5. Section No. 8 of the first thoracic ganglion of the youngest embryo (see, also, 
Plate xii, figs. 1, la, and fig. 10). The hour-glass-shaped ganglion consists of 
inner granular nervous matter (gran.), with no fibers present, and of a layer 
of cortical ganglionic cells (gang, c), the layer being thickest on the under 
side of the ganglion and wanting at and near the middle of the upper side. 
Magnified 225 diameters. 
Fig. G. Section No. 15 of older embryo, represented also by figs. 2-9 of Plate xii. show- 
ing the nervous cord (n. c), surrounded by connective-tissue cells ; X $ A. 
Fig. 7. Section No. 16 through the same embryo, posterior to section 15, the cord 
being smaller than in section 15. These sections were cut just in front of 
the stomach and cceca. 
