Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . n off laterally from the upper part of eachhemisphere ; lower down, and on the front of thebrain are the two gently rounded antennary lobes,from each of which proceeds an antennary nerve ;while from the front and upper part of each hemi-sphere a small nerve passes to the so-called ocellus, * For the Natural History, Outer Skeleton, AlimentaryCanal, and Organs of Respiration and Circulation of the Cock-roach, see this Journal, March, May, July, and September,1884. f Mons. Yung ( .Sys
Hardwicke's science-gossip : an illustrated medium of interchange and gossip for students and lovers of nature . n off laterally from the upper part of eachhemisphere ; lower down, and on the front of thebrain are the two gently rounded antennary lobes,from each of which proceeds an antennary nerve ;while from the front and upper part of each hemi-sphere a small nerve passes to the so-called ocellus, * For the Natural History, Outer Skeleton, AlimentaryCanal, and Organs of Respiration and Circulation of the Cock-roach, see this Journal, March, May, July, and September,1884. f Mons. Yung ( .Syst. nerveux des Crustacees , de Zool. exp. ct gen., toui. vii. 1878) proposes to name(-oniiectivLS the longitudinal bundles of nervc-iibres which unitethe ganglia, and to reserve the term cominissurcs for thetransverse brrnches. a transparent spot lying internal to the antennarysocket on each side in the suture between the clypeusand the epicranium. The sub-oesophageal gangliongives off branches to the mandibles, maxillae andlabruni. While, therefore, the supra-cesophageal is xo/. Fig. 144.—Nervous system of female Cockroach, X 6. a, opticnerve; b, antennary nerve; c, d, e, nerves to lirst, second,and third legs ; /, to wing-case ; g^, to second thoracic spi-racle ; h, to wing; i, abdominal nerve ; j, to cerci. largely sensory, the sub-cesophageal ganglion is themasticatory centre. The oesophageal ring is double below, being com-pleted by the connectives and the sub-oesophagealganglion; also by a smaller transverse commis- HA RD WICKES S CIENCE- G OS SI P. 245 sure, which unites the connectives, and applies itselfclosely to the under surface of the oesophagus.* Two long connectives issue from the top of the sub-cesophageal ganglion, and pass between the tentoriumand the submentum on their way to the neck andthorax. The three thoracic ganglia are large, incorrespondence with the important appendages ofthis part of the body, and united by double conn
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