Evolution By Atrophy in Biology And Sociology

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, Zool. Harvard College, vol. Xviii. , 1895. ) habitant of the Atlantic at a depth of about 3500 yards, is com- pletely devoid of eyes in the adult condition, although it possesses them in the larval stage.
Scolophthalmus (fig. 65), which lives down to 4000 yards, is quite devoid of eyes, but possesses eye-stalks which terminate in spines.
It seems, then, that different species of deep-sea Crustacea may present different degrees of degenera- tion of the eye. One species in itself exhibits all F
...IG. M. WHlemcesia. (After Pelseneer. ) 190 THE PATH OF DEGENEEATIVE EVOLUTION grades of degradation according to the depth at which it lives. This creature Cymonomus which, when near the surface, has fully formed eyes upon movable stalks, at a depth of a few hundred yards exhibits movable stalks without eyes; and at 1500 yards the stalks are fixed and end in spines.
Isopod Crustacea, which live in the deep sea, present similarly degenerate eyes. Many are blind FIG. 65. Scolophlhalmus lucifugus, FAX.


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