Figs. 
Fig. 
Figs. 
Fig. 
Fig. 
Figs. 
1, 3. 
4-6. 
PLATE III. 
Transverse sections of Calymene senaria enrolled. Enlarged to three 
diameters. 
s. Dorsal shell. 
v. Visceral cavity. 
b, b. Branchiæ. 
4, 4. Cephalic legs. 
Transverse section of Ceraurus pleurexanthemus. Enlarged to three 
diameters. 
s. Dorsal shell. 
v. Visceral cavity. 
c. Cephalie cavity. 
e, Eye cut across. 
b, b. Branchie. 
Longitudinal sections of the same species. Enlarged to five diameters: 
s. Dorsal shell. 
c. Frontal lobe of the dorsal shell of the head. 
s. Sections of the spinous extension of the pleure. See Fig. 5, 
Plate IV. 
p. Posterior extremity of the pygidium. 
b, b. Branchiæ. 
. Transverse section of the same species. Enlarged to two diameters. 
s. Dorsal shell, 
b. Branchiæ. 
4. Position of the intestinal canal. 
a, a”. Distorted basal portion of thoracic legs. 
Transverse section of a portion of an enrolled Calymene senaria. En- 
larged to five diameters. 
s. Dorsal shell. 
v. Visceral cavity. 
b. Branchiæ. 
Transverse sections of the thorax of tho same species. Enlarged to 
three diameters. 
8, v, b, b. As in preceding figures. 
4, 4. Basal joints of thoracic legs. 
e. Epipodite or branchial arm. 
n, Fig. 10. Detached segment, supposed to be, from the posterior 
cephalic leg. 
