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Considering this uniformity presented by the heart in the entire order of the Amphipoda, it cannot but seem very remarkable, that in the very next order of the Isopoda, we find it to be one of the most changeable organs. Heart of a young Cassidina. Heart of a young Anilocra. Abdomen of the male of Entoniscus Cancrorum. h. Heart. l. In all other Isopoda the heart is removed towards the abdomen.
The curvature of the embryo upwards instead of downwards was met with by me as well as by Rathke in Idothea, and likewise in Cassidina, Philoscia, Tanais, and the Bopyridae, indeed, I failed to find it in none of the Isopoda examined for this purpose.
In Cassidina also the first larval skin without appendages is easily detected; it is destitute of the long tail, but is strongly bent in the egg, as in Ligia, and consequently cannot be mistaken for an "inner egg-membrane." This interpretation is by no means a happy one.
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