. An introduction to the study of zoology : by T. H. Huxley, F. R. S. ; with eighty-two illustrations. Crayfish; Zoology. 342 DISTRIBUTION AND ETIOLOGY OF THE CRAYFISHES. and left their remains in the mud of the ancient sea bottom. Eryma is the onlj' crustacean, which can be certainly ascribed to the Astacomorpha, that has hitherto been found in the strata from the Middle Lias to the litho- graphic slates; -which last lie in the upper part of the Jurassic series. In the freshwater beds of the Wealden, Astacomorpha are known, and although no very great. Pig. 81. — IToploparia longimana (f n
. An introduction to the study of zoology : by T. H. Huxley, F. R. S. ; with eighty-two illustrations. Crayfish; Zoology. 342 DISTRIBUTION AND ETIOLOGY OF THE CRAYFISHES. and left their remains in the mud of the ancient sea bottom. Eryma is the onlj' crustacean, which can be certainly ascribed to the Astacomorpha, that has hitherto been found in the strata from the Middle Lias to the litho- graphic slates; -which last lie in the upper part of the Jurassic series. In the freshwater beds of the Wealden, Astacomorpha are known, and although no very great. Pig. 81. — IToploparia longimana (f nat. size). — cp, carapace; r, rostrum, T, telson ; xv., xvi., first and second abdominal somites •. 10, forceps ; 20, last abdominal appendage. weight is to be attached to a negfttive fact of this kind, it is, so far, evidence that the Astacomorpha had not yet taken to freshwater life. In the marine deposits of the Cretaceous epoch, however, astacomorphous forms, which. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Huxley, Thomas Henry, 1825-1895; Huxley, Thomas Henry, 1825-1895. Crayfish. New York : D. Appleton
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