504. PROF. OWEN ON THE ANATOMY 
Fig. 1. n *. Chilarian nerve. 
n vir. Opercular nerve. 
n 1x-x111. Nerves to branchiigerous limbs. 
n x1v. Nerve of anal segment. 
o. Ostia venosa. 
pl. Pleonic plexus. 
Muscular wall of heart. . 
Neural artery. 
Pleonic artery. 
Brain, or supercesophageal nervous centre. 
Neural ring. 
Neural cords. 
First ganglion. 
Second ganglion. 
Third ganglion. 
Fourth ganglion. 
Fifth or terminal ganglion. 
. Ganglionic loop. 
Pleonal nerve, or continuation of neural cord. 
. Principal nerve of 
pl. Pleonal plexus. 
a 1-4. Dorsal nerves of four anterior coalesced pleonal segments. 
Fig. 2. Vertical longitudinal section of fore part of cephaletron and alimentary canal, with the cephaletral 
limbs or appendages of the right side. (The Preparation is No. 477 a, in the Physio- 
logical Series of the Museum of the Royal College of Surgeons: ‘ Descriptive and 
Illustrated Catalogue,’ 2nd ed. 8vo, 1852, p. 132.) 
A, 11 to vit, and *, as in figure 1. 
b. Dorsal wall of cephaletron. 
c. Ventral wall of cephaletron. 
d. Digging-border. 
f. Chitine. 
9. Pigment-layer. 
e. Œsophagus. 
h. Entosternon. 
i. Intestine. 
l. Anterior hepatic duct. 
m. Posterior hepatic duct. 
p. p. Carding-plates, or palpi, of haunch-joints of 111-vir. 
*. Chilarion, a seemingly serial repetition of haunch-joints. 
g. Median lobe of ovary. 
r. Proventrieular or cardiac part of stomach. 
s. Gizzard. 
t. Pyloric prominence. 
Fig.3. Maxilla (5th cephaletral limb). 
1. Coxa. 
p. Its * palp,” or ing-plate. 
2. Basis. 
3. i 
Pt eG we A LAR NS 
