File:Sphaerotherium obtusum EB1911.png

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Summary

Description
English: Diagram of the nervous and circulatory system of Sphaerotherium obtusum, a South African species of Oniscomorpha. After G. C. Bourne, J. Linn. Soc. xix., Pl. 29, 1886.

c, Head.

oc, Eye-cluster.

ant, Antenna.

md, Basal segment of mandible.

tg2 and tg13, Part of the terga of the second and thirteenth segments.

cb, Cerebral ganglia supplying tr, Tracheal tubes with spiral the eyes and antennae.

oes, Oesophagus, cut through.

sb.gl, Suboesophageal or First ganglion of ventral chain.

gl2 and gl22, Second and twenty second ganglia of chain, the posterior nerve of each ganglion, lg.n, supplies the leg, the anterior, tr.n, the tracheal sac and other organs;

n.gon, Nerve to gonopods.

tr.s, Tracheal sac.
Date
Source Encyclopædia Britannica (11th ed.), 1911, v. 18
Author Unknown authorUnknown author

Licensing

Public domain This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

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