JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATES XV, XVL 



Illustrating Mr. E. T. Newton's paper on the Brain of 

 the Cockroach, Blatta orientalis. 



All the figures, except Nos. 3 and 4, drawn with camera lucida. 



Eeferences. 



hs. Hemisphere of brain. e. Facetted eye. ant. Antenna. an. 

 Antennary nerve. /. Labrum. ws. White spot. nws. Nerve to 

 white spot. op. Optic nerve or ganglion. aiil. Antennary lobe. 



anm. Nerve to antennary muscle. fg. Frontal ganglion. In. 



Nerve to labrum. oe. (Esophagus. mn. Nerves to mandible. 



«/.r. Nerves to maxillae. Im. Nerves to labium. itif. g. Infra-a3so- 

 phageal ganglion. o. com. (Esophageal commissure. b. corn. Com- 

 missure to body ganglion. nf. Nerve to muscles (?) near foramen 

 magnum. a. stg. Anterior stomato-gastric ganglion. p. stg. Posterior 

 stomato - gastric ganglion. fn. Median nerve from frontal ganglion. 

 a. com. Anteunary commissure. t. Trabecula. p. Peduncle. icx. 

 Inner calix of corpus fungiforme. ocx. Outer calix of corpus fungiforme. 

 cxc. Cells of calix. c. Corpus centrale. can. Cauliculus. gc. 

 Ganglionic cells. nfg. Nerve from oesophageal commissure to frontal 

 ganglion aud labrum. n. Nerve from back part of antennary lobe. 



PLATE XV. 



Fig. 1. —Front view of head, x 25 diameters. Chitin partly removed to 

 show position of brain and general relation of parts. 



Fig. 2. — Side view of brain, with infra-oesophageal ganglion, x 25 

 diam. 



Fig. 3. — Infra-oesopliageal ganglion, seen from behind, with nerves to the 

 mouth organs. X 25 diam. 



Fig. 4. — The brain and stomato-gastric ganglia seen from above. The 

 latter resting on oesophagus, x 25 diam. 



PLATE XVL 



Figs. 5 to 10. — Frontal sections of brain, selected from a series of 34 

 made from one specimen. x 60 diam. Fig. 13 represents the entire 

 section ; in the others only one half is drawn. 



Fig. 5. — Section No. 2 from front, showing the cauliculus covered by the 

 cells of the caiices. 



