The embryology and metamorphosis of The embryology and metamorphosis of the Macroura embryologymetamo00broo Year: 1891] MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 375 Habitat of Alpheua. Length of $ . Numlicr of 'Rgs. Diameter. Color. Color of adult. Indies. Inches. Brown sponge. . . i 19 A Yellow (variable). . . . Large chelre, red (blue or brown in others. ) Green sponge 1A 347 A- Usually green ; in Large chela?, orange- this case yellow. red. These two forms, although apparently distinct, are seen, however, by closer study to belong to the same species; but besides the more superficial v
The embryology and metamorphosis of The embryology and metamorphosis of the Macroura embryologymetamo00broo Year: 1891] MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 375 Habitat of Alpheua. Length of $ . Numlicr of 'Rgs. Diameter. Color. Color of adult. Indies. Inches. Brown sponge. . . i 19 A Yellow (variable). . . . Large chelre, red (blue or brown in others. ) Green sponge 1A 347 A- Usually green ; in Large chela?, orange- this case yellow. red. These two forms, although apparently distinct, are seen, however, by closer study to belong to the same species; but besides the more superficial variations just mentioned, there are others of a more remarkable character, the morphological significance of which is considered in sections IV and v. Of this species, Alpheus saulcyi, Guerin, it is necessary, for descriptive purposes, to distin- guish two varieties, viz: Alpheus saulcyi, variety longicarpus (from brown sponges), Alpheus saulcyi, variety brevicarpus (from green sponges). These two varieties shade completely into each other by numerous intermediate forms. The longicarpus varies greatly in size and in the color of the body and eggs (besides the other more profound variations mentioned in section v), while the brevicarpus type from the green sponges is more uniform in size and stable in color and other characters. The former variety is well pro- tected from outside enemies while in the tortuous mazes of its sponge, as its great numbers would show, if any evidence under this head were needed. The enemies which invade them successfully seem to be parasites.* Possibly the variety inhabiting the green sponge does require color-protection, especially since the females are very inert during the breeding season. They are, indeed, admirably protected when exposed on the green surface of sponges, alga;, etc. The bright color on the tips of the large claws, which only are protruded from the places of concealment, recall the similarly colored heads of boring annelids, which
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