. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . ishes inthe caves are adapted to theircondition, the eyes being obso-lete, while the skin is coveredwith rows of sensitive similar circumstances sala-manders, crayfishes, and insectsare also blind. There are alsoblind gobies which live in thecrevices of rocks and still otherblind fishes in the great depthsof the sea. Some fishes, as the lancelet, lie buried in the sand all theirlives. Others, as the sand darter (Ammocrypta pelliicidd) andthe h
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . ishes inthe caves are adapted to theircondition, the eyes being obso-lete, while the skin is coveredwith rows of sensitive similar circumstances sala-manders, crayfishes, and insectsare also blind. There are alsoblind gobies which live in thecrevices of rocks and still otherblind fishes in the great depthsof the sea. Some fishes, as the lancelet, lie buried in the sand all theirlives. Others, as the sand darter (Ammocrypta pelliicidd) andthe hinalea (Julis gaimardi), bury themselves in the sand atintervals to escape from their enemies. Some live in thecavities of tunicates or sponges or holothurians or corals oroysters, often passing their whole lives inside the cavity of oneanimal. Many others hide themselves in the interstices ofkelp or seaweeds. Some eels coil themselves in the crevicesof rocks or coral masses, striking at their prey like sea-horses cling by their tails to gulf weed or little fishes (Gobiomorus, Carangus, Psenes) cluster under. FIG. 195.—Torpedo or electric ray,Narcine brasiliensis, showing elec-tric cells. ADAPTATIONS 335 the stinging tentacles of the Portuguese man-of-war or underordinary jellyfishes. Some fishes called the flying fishes sail through the air witha grasshopperlike motion that closely imitates true long pectoral fins, wingiike in form, cannot, however, beflapped by the fish, the muscles serving only to expand or foldthem. These fishes live in the open sea or open channels,swimming in large schools. The small species fly for a few
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