The group Spiralia includes species with one of the most significant cases of left–right asymmetries in animals: the coiling of the shell of gastropod molluscs (snails). In this animal group, an early ...
IN the issue of NATURE for Dec. 13, Mr. G. L. Purser gives us an analogy of the modern manufacture of motor cars as a contribution to the solution of the problem of embryonic evolution which is novel ...
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