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Updated: May 6, 2025
Once, however, as I sat alone in the middle of the floor, classifying my isopods, I was not only astonished but totally unprepared to find myself repeating aloud a verse that I myself had unconsciously fashioned: "An isopod Is a work of God." Never before in all my life had I made a rhyme; and it worried me for weeks, ringing in my brain day and night, confusing me, interfering with my thoughts.
In the adult animals the number of limbs is the same; at the first sight of a Cyrtophium or a Dulichia, and even after the careful examination of a Tanais, we may be in doubt whether we have an Isopod or an Amphipod before us; in the newly-hatched young the number of limbs is different, and if we go back to their existence in the egg, the most passing glance to see whether the curvature is upwards or downwards suffices to distinguish even the youngest embryos of the two orders.
The latter, as is well known, is the only Isopod which possesses a secondary flagellum on the anterior antennae. Mr. With regard to the Crabs, and also to the Isopoda and Amphipoda, we were led to the assumption that, about the period when these groups started from the common stem, a simplification of their process of development took place. This also seems to be intelligible from Darwin's theory.
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