APPENDAGESAND NERVOUS SYSTEM OFAPUS CANCRIFORMIS. 373 
investigators have traced the nerves of the ‘wo first append- 
ages of Limulus to the cerebral ganglion, and others have 
decided that only one (the first) pair derive their nerves from 
this ganglion—it appears from the admirable researches of 
M. Alphonse Milne-Edwards, that none of the appendages 
receive their nerves from the cerebral ganglion, but that it 
exists as a distinct emarginated mass of nervous matter, 
giving off nerves only to the simple and compound eyes and 
the frontal integument, as shown in the woodcut, fig. 3. 
Fic. 3.—Diagram of the anterior portion of the nervous system of Zimu- 
lus polyphemus, seen from below (schematized after Alphonse Milne- 
Edwards). 
@. Position of cesophagus. 
C. Archi-cerebrum. 
oc. Nerves to the compound eyes. 
tg. Frontal tegumentary nerves. 
st. Nerve to the stemmata. 
chi. Nerve to the chilaria (left side). 
Op. Nerve to the operculum (left side), 
I. Nerves of the chelicerze or first pair of appendages. 
II to VI. Nerves of the second, third, fourth, fifth, and sixth pairs of 
appendages. 
An attempt has already been made to investigate the 
development postoral and distinct from the archi-cerebrum. ‘This Journal, 
April, 1880. 
