Volume 2

A monograph of the British fossil crustacea, belonging to the order merostomata / by Henry Woodward.

  • Woodward, Henry, 1832-1921.
Date:
[between 1860 and 1869]
Catalogue details

Licence: Public Domain Mark

Credit: A monograph of the British fossil crustacea, belonging to the order merostomata / by Henry Woodward. Source: Wellcome Collection.

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    UPPER SILURIAN CRUSTACEA. Order—Me rosto m ata . Sub- Order—Eurypterida. Fig. 1. Fterygotus bilobus, var. /3, crassus. 0, 0. The compound eyes. s. The serrated mandibular border of one of the ectognaths. ec, ec. The ectognaths, preserved in. situ, e. One of the endognaths, displaced. a. A chelate antenna ; the claw or pincer hidden beneath the telson. .2 a. Seven of the anterior segments of Ft. bilobus var. y, perornatus (= var. plieatissimus, Salter). op. The opercular plate, squeezed forward and much distorted. c. The central appendage of same. hr. The branchim exposed to view, protruding from beneath the upper and originally attached border of the operculum. 2 b. The above described portion of 2 a, magnified twice (the letters are the same as in fig. 2 a, above). [The direction of the plicie upon the operculum indicates that the loioer edge in our Plate was that by which it was originally attached to the pos- terior border of the under side of the head. The head, and probably the first two body-segments, are wanting.] 3. Detached antennae of a very large Fterygotus (probably Ft. bilobus, var. y). ch. The moveable chela, with its large teeth, resembling those of Ft. anylicus (see Part I, PI. VII, figs. 1—3). The surface at b is covered with the valves of Beyrichia Klcedeni or yibba (a small bivalved Entomostracan), a pair of which are enlarged and figured at b 1. Pigs. \, 2 a, and 3, are drawn of the natural size; fig. 2 b magnified twice; fig. b 1 magnified six times. From Uppermost Silurian of Lesmahago, Lanarkshire. Figs. 1 and 3 are in the British Museum. Fig. 2 is in the Museum of Practical Geology, Jennyn Street.