. The Crayfish : an introduction to the study of Zoology. DISTINCTIVE CHAHACTEUS UF THE (,'HAYFISH. 28o spine. The elevation itself may be distinguished as the j)ost-orhital ridge. The flattened surface of this ridge is mai'ked by a longitudinal depression or groove. Tlie A B C. 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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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondon, bookyear188