Sesarma chiragra, A FRESHWATER CRAB OF FAMILY GRAPSIDÆ. FROM BRAZIL. (SLIGHTLY REDUCED)
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The groups which have been mentioned are all characteristic inhabitants of the fresh waters over considerable areas of the surface of the globe. There are, however, in addition to these, certain Crustacea which occur in isolated localities, and have no close allies in fresh waters elsewhere. In the streams of Southern Brazil and Chili there is found a small Crustacean (Æglea lævis—[Plate XXIV].), not unlike the Galatheas of our own coasts, which is interesting as being the only species of the Anomura found in fresh water. Still more remarkable are the Syncarida, which are represented by two species of "Mountain Shrimps" (see [Fig. 84], p. 264) in Tasmania, and by a third species found near Melbourne. These forms have no near allies among living Crustacea, but appear to be related, as will be shown in a later chapter, to certain fossil Crustacea found in Palæozoic rocks.
PLATE XXIV
Æglea lævis. SOUTH AMERICA. (NATURAL SIZE)
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