. An introduction to the study of zoology. Zoology. VERTEBRATA. 253 better-developed brains than any other fishes. Dog- fishes are common, and may easily be obtained for study. The cartilaginous skull is often found on the sea-shore at certain seasons—an oblong object which is very puzzling at first sight. The egg-shells also are often seen : those of the dog-fish are transparent. •Egg of a Dog-fish, Scj/IKum. and greenish, with four long tendril-like strings, by which they attach themselves to seaweeds: those of the skate have four short horns instead, and have a black shiny surface which is
. An introduction to the study of zoology. Zoology. VERTEBRATA. 253 better-developed brains than any other fishes. Dog- fishes are common, and may easily be obtained for study. The cartilaginous skull is often found on the sea-shore at certain seasons—an oblong object which is very puzzling at first sight. The egg-shells also are often seen : those of the dog-fish are transparent. •Egg of a Dog-fish, Scj/IKum. and greenish, with four long tendril-like strings, by which they attach themselves to seaweeds: those of the skate have four short horns instead, and have a black shiny surface which is suggestive of a beetle. The skin of the Dog-fish is rough with small bony granules, which are ossifications of the projections or papillae of the dermal layer of the skin. These were. 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 Lindsay, B. London, S. Sonnenschein
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
