. The Crayfish : an introduction to the study of Zoology. 342 DISTRIBUTION AND ETIOLOGY OF THE CRAYFISHES. and left their remains in the mnd of the ancient sea bottom. Eryma is the onlj^ crustacean, which can be certainly ascribed to the Astacomorpha, that lias hitherto been found in the strata from the JNIiddle I^ias to the litho- graphic slates; which last lie in the upper part of the Jurassic series. In the freshwater beds of the Wealden, no Astacomorpha are known, and although no very great. Fig. 81. — Hoplojxirin lonffimana (f nat. size).— rj>. carapace; r, rostrum, T, telson ; xv., xv
. The Crayfish : an introduction to the study of Zoology. 342 DISTRIBUTION AND ETIOLOGY OF THE CRAYFISHES. and left their remains in the mnd of the ancient sea bottom. Eryma is the onlj^ crustacean, which can be certainly ascribed to the Astacomorpha, that lias hitherto been found in the strata from the JNIiddle I^ias to the litho- graphic slates; which last lie in the upper part of the Jurassic series. In the freshwater beds of the Wealden, no Astacomorpha are known, and although no very great. Fig. 81. — Hoplojxirin lonffimana (f nat. size).— rj>. 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 negative 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 foi'ms, 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. London
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