File:1911 Britannica-Arachnida-Limulus polyphemus3.png

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Description
English: Diagram of the dorsal surface of Limulus polyphemus.
oc, Lateral compound eyes.
oc′, Central monomeniscous eyes.
PA, Post-anal spine.
I to VI, The six appendage-bearing somites of the prosoma.
VII, Usually considered to be the tergum of the genital somite, but suggested by Pocock to be that of the otherwise suppressed praegenital somite.
VIII to XIII, The six somites of the mesosoma, each with a movable pleural spine and a pair of dorsal entopophysis or muscle-attaching ingrowths.
XIV to XVIII, The confluent or unexpressed six somites of the metasoma.
(From Ray Lankester, Quart. Journ. Micr. Sci., vol. xxi., 1881.)
Date
Source Encyclopædia Britannica Eleventh Edition, Vol. 2, Page 289
Author Encyclopædia Britannica, 1911

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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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