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BRITISH FOSSIL CRUSTACEA. 



who ascertained the exact bed from which these remains were derived, and which proved to 

 be the " Ferny Metal," under the " Big Coal" or " Ram's Mine." 



Fig. 54. — (1-7). — Eurypterus {Arthropleura ?) mammatus, Salter. 



(8). — Arthropleura (Euphoberia ?) ferox, Salter. 

 (Woodcut from the ' Quart. Journ. Geol. Soc.,' 1863, vol. xix, p. 84.) 



The plants occurring in this bed, noticed by Mr. Salter, are — 



Lepidodendron obovatum, Stemb. 



,, Sternbergii, Brong. 



„ elegans, „ 



Neuropteris Loshii, Lindl. 



„ heterophylla, Sternb. 



Neuropteris gigantea, Sternb. 

 Cyclopteris flabellata, Brong. 

 Sphenopteris obfusiloba, ,, 

 „ laiifolia, „ 



and some others. 



The bed lies rather high in the " Middle Coal series." 



The specimen figured on PI. XXIV, fig. 2, is considered by Mr. Salter to be the 

 lateral portions of the head-shield, which he thinks must have been at least 8 or 9 inches 



