The evolution theory . Fig. 109. D, M^sis-stage. Thirteen p;iirs of appendages are now formed :I and II, antennae ; III, mandibles ; IV and V, maxillae ; VI-XIII, swimmingappendages with one branch or with two. Ahd, abdomen. Sfl, , the fully-formed Shrimp, with thirteen pairs of appendages on thecephalothorax {Cpli); I and II, the two pairs of antennae ; then follow themaxillae and maxillipedes (III-VIII). the last of which is visible in the figure,and the five pairs of walking-legs {IX-XIII) of which the third bears a longchela. On the abdomen there are now six pairs of appendages (
The evolution theory . Fig. 109. D, M^sis-stage. Thirteen p;iirs of appendages are now formed :I and II, antennae ; III, mandibles ; IV and V, maxillae ; VI-XIII, swimmingappendages with one branch or with two. Ahd, abdomen. Sfl, , the fully-formed Shrimp, with thirteen pairs of appendages on thecephalothorax {Cpli); I and II, the two pairs of antennae ; then follow themaxillae and maxillipedes (III-VIII). the last of which is visible in the figure,and the five pairs of walking-legs {IX-XIII) of which the third bears a longchela. On the abdomen there are now six pairs of appendages (JTIF-JTIX). the conditions of larval life. The elimination of the larvae by enemies,for instance, will, other things being equal, be so much the moreincisive the longer the larval development is protracted, but in thatcase the general ratio of elimination of the species, and the degree offertility the species must possess in order to hold its own in thestruggle for existence, will also play a part in determining the mo
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Keywords: ., bookauthorthomsonj, bookcentury1900, bookdecade1900, bookyear1904
