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Updated: June 17, 2025
The brains became larger and more powerful. In us you see the highest development; but there are those of us who believe that there is yet another step that some time in the far future our race shall develop into the super-thing just brain. The incubus of legs and chelae and vital organs will be removed. The future kaldane will be nothing but a great brain.
Bate, the chelae are sometimes of such length and size that they cannot possibly be used for carrying food to the mouth. See a paper by Mr. C. Spence Bate, with figures, in 'Proceedings, Zoological Society, 1868, p. 363; and on the nomenclature of the genus, ibid. p. 585. I am greatly indebted to Mr. 'Hist.
The simple median eye appears earlier, and would therefore be more important than the compound paired eyes; the scale of the antennae in the Prawns would be more important than the flagellum; the maxillipedes of the Decapoda would be more important than the chelae and ambulatory feet, and the anterior six pairs of feet in the Isopoda, than the precisely similarly formed seventh pair; in the Amphipoda the most important of all organs would be the "micropylar apparatus," which disappears without leaving a trace soon after hatching; in Cyclops the setae of the tail would be more important than all the natatory feet; in the Cirripedia the posterior antennae, as to which we do not know what becomes of them, would be more important than the cirri, and so forth.
Fritz Muller has described a remarkable dimorphic species of Tanais, in which the male is represented by two distinct forms, which never graduate into each other. In the one form the male is furnished with more numerous smelling-threads, and in the other form with more powerful and more elongated chelae or pincers, which serve to hold the female.
"Then there is a way sst!" he was suddenly silent and pointing toward the base of the wall at the end of the room. Turan looked in the direction the other's forefinger indicated, to see projecting from the mouth of an ulsio's burrow two large chelae and a pair of protruding eyes. "Ghek!" he cried and immediately the hideous kaldane crawled out upon the floor and approached the table.
The head climbed to the shoulders and settled itself inside the leather collar that now hid its chelae and legs. Almost immediately the body gave evidence of intelligent animation.
How earlier young states may gradually be completely lost, is shown by Mysis and the Isopoda. Like the spinous processes of the Zoeae, the chelae on the penultimate pair of feet of the young Brachyscelus are to be regarded as acquired by the larva itself.
In most of the orders, especially in the highest or the Brachyura, the male is larger than the female; the parasitic genera, however, in which the sexes follow different habits of life, and most of the Entomostraca must be excepted. The chelae of many crustaceans are weapons well adapted for fighting.
It will be easily understood how in this manner all the intermediate steps less favoured in the development of the olfactory filaments or of the chelae would disappear from the lists, and two sharply defined forms, the best smellers and the best claspers, would remain as the sole adversaries.
By an increase in the size of this projection, with its shape, as well as that of the terminal segment, slightly modified and improved, the pincers are rendered more and more perfect, until we have at last an instrument as efficient as the chelae of a lobster. And all these gradations can be actually traced. Besides the avicularia, the polyzoa possess curious organs called vibracula.
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