FOSSIL FAUNA. 155 



PLATE LXVIII. 



Fossil Crustacea. 



Figs. 1, & 3. " Fossil Crabs, from Sheppey." — 3Ir. Parkinson. The Loudon clay of this 

 celebrated locality contains an abundance of the fossil remains of Crustacea ; and the 

 visitor may purchase of the local collectors fossil crabs and lobsters, as readily as the 

 recent species from the neighbouring sea. Good specimens are however rare, and 

 command high prices. The specimens figured are two common species. 



Fig. 1. Cancer Leachii, of MM. Desmarest and Brongniart. 



Fig. 3. Inachus LamarcML 



These fossils show the usual mode in which the crustaceas occur in the hardened clay of 

 Sheppey. The thorax is bent over the abdomen, and the pair of large chelate claws drawn 

 towards each other. 



Fig. 2. Fossil Insects from tbe lithographic stone of Pappenheim. "a, an insect with a 

 bifurcated caudal extremity ; h, the sting which has passed out of its sheath; c, the 

 termination in a single point." — Mr. Parkinson. 



Fig. 4. "A fossil Shrimp, from Anspach." — Mr. Parkinson. 



Fig. 5. " Impression of an unknown fossil." — Mr. Parkinson. 



Fig. 6. " The claw of a Crab, from Maestricht, &c." — Mr. Parkinson. Claws of this kind are 

 frequent in the soft sandy limestone of St. Peter's Mountain, but no other vestiges 

 of the Crabs to which they belonged have been met with. The cause of this has 

 been ascertained : the claws belong to a species of Hermit Crab {Pagttrus Fatijasii, 

 of Desmarest), which like the living species had the body covered by a delicate 

 membrane, the claws only possessing a durable crustaceous shell.' 



Fig. 7. "An extended trilobite, from Dudley." — Mr. Parkinson. Among the organic remains of 

 the inhabitants of the seas, in whose abysses were formed the Silurian, Devonian, and 

 other ancient sedimentary strata, an extinct family of crustaceans, comprising 

 numerous genera, are among the most characteristic and remarkable. The name 

 " Trilobite," first given by Mr. Parkinson, expresses the most obvious character of 

 the longitudinally trilobed, convex, segmented, carapace of the body, of the most 

 common forms ; but so great is the number of species, and so dissimilar the groups, 

 now known, that the nomenclature of this class of fossils is greatly extended. In 

 Sir K. I. Murchison's splendid work on the Silurian System, the genera and species 

 of the formations therein comprised are beautifully illustrated. The specimen 



' Wonders of Geology, p. 338. 



