332 JouRNAL OF COMPARATIVE NEUROLOGY. 
Insecta and Myrio-|Arachnida and 
Crustacea poda Limulus 
ist somite Optic and psychic|Optie and psychic|Optic and psychic 
centers centers centers 
Protocerebrum /|Innervates the eyes|Innervates the eyes) Innervates the eyes 
2nd somite Olfactory center Olfactory center Tactile center 
Deutocerebrum /|Innervates the 1st|Innervates the ist|Innervates the che- 
antennae antennae  |liceres and rostrum 
Gives a root to the|Gives a root to the/Gives a root to the 
visceral system visceral system visceral system 
nters connected by the pre- 
oesophageal commissures 
3rd somite Antennary lobe 
Brain 
Tritocerebrum Tactile center 
Absent Absent 
Innervates the 2nd 
antennae 
Oesophageal gan-|Oesophageal gan- 
| Ce 
— DN ee ee ee eee eee 
3 
a 
80 
s 
E=| 
a 
} 
a 
o 
° 
23 
glia glia 5.5 
. ek 
Gustatory center a5 
; é Absent eae 
Innervates the lips/{nnervates the lips = 3 
—— oo 
Gives a root to the/Gives a root to the =| 
visceral ganglia visceral ganglia 8 J 
ES | PE || 
4th somite Innervates the |[nneryates the |Innervates the 8 
a mandibles mandibles mandibles and Ist} a 
ist _post-oesopha- pair of maxillae | 6 
geal ganglion 
C. H. Turner (’96) discusses the gross morphology of 
central and peripheral nervous system, but does not discuss the 
histology of the former. The following is a recapitulation of 
that paper. 
1. The nervous system of Cypris consists of a supra- 
oesophageal ganglion connected to a ventral chain by a pharyn- 
geal collar. 
2. The ventral chain consists of a sub-oesophageal gan- 
glion, which has probably been compounded out of at least 
three ganglia, and two subsequent ganglia. 
3. From the supra-oesophageal ganglion arise a median 
unpaired optic nerve and paired antennulary and antennary 
nerves. The antennary nerve, which arises from the place of 
union of supra-oesophageal ganglion and collar, receives a por- 
tion of its fibers from the collar. 
4. From the sub-oesophageal ganglion arise the following 
