NO. 4 NERVOUS SYSTEM OF A CENTIPEDE — LORENZO 37 



emerges from a stomatogastric bridge which is poorly developed and 

 incorporated in the ventral portion of the brain. Other nerves emerg- 

 ing from the supraesophageal and subesophageal ganglia are de- 

 scribed. 



4. The neurohistology of bipuncticeps was studied. The cellular 

 cortex of the ganglia contains cells whose processes turn inward to 

 form part of the fibrous medullary neuropile. The neurilemma! ele- 

 ments consist of an outer homogeneous "neural lamella" and a cellular 

 "perilemma" containing at least three types of cells. Motor neurons, 

 associational neurons, and neuroglial cells may be differentiated on the 

 basis of staining qualities. Four "giant" cells, possibly of a neuro- 

 glandular nature, are present in the antero ventral portion of the sub- 

 esophageal ganglion. 



5. Fibrous entities in the neuropile were examined and homolo- 

 gized. "Antennal glomeruli," the "corpus lamellosum," and "olfac- 

 torio-globularis tract" are identified. Connections between the an- 

 tennal lobes and subesophageal ganglion are observed. The "corpora 

 pedunculata" and "central complex" do not appear in bipuncticeps, 

 and it is highly improbable that there exist vestiges or Anlagen of 

 these complex elements in the geophilomorph brain. The commissures 

 located in the median plane are homologized with the named commis- 

 sures of higher chilopods. 



6. The cephalic nervous system of bipuncticeps is simply organized 

 and less complex than those in the other orders of the Chilopoda. 



ABBREVIATIONS USED ON THE FIGURES 



a,b,c, three types of perilemmal D, deutocerebrum. 



nuclei. DC, deutocerebral commissure. 

 ADC, anterior commissure of D. Dl, Dm, lateral, medial lobe of deuto- 



AL, antennal lobe. cerebrum. 



ANT, antenna. exo, exoskeleton. 



ax, axon of giant cell in SBG. ffi, fibers of nerve to intrinsic an- 



bv, haemolymph vessel associated tennary musculature emerg- 



with the cerebral gland. ing from the neuropile. 



bn, black-staining neuroglial nu- ff2, fibers from nucleus of origin 



cleus. of N9. 



CBV, cerebral haemolymph vessel. flfs, fibers from the pars inter- 



CC, central complex. cerebralis. 



CGL, cerebral gland. flfi, fibers from frontal lobe in 



elm, corpus lamellosum. the large protocerebral 



CLYP, clypeus. commissure. 



COES, commissure of circimieso- FG, frontal ganglion, 



phageal connectives. FL, frontal lobe. 



CPL, cephalic plate. gen, giant cell nucleus. 



