[187] Nothing appears to be known with reference to the manner in which it comes about that more than one appendage is borne on each of the segments from the eleventh to the twentieth. An investigation of this point would be of some interest with reference to the meaning of segmentation.
[188] The doubts which have been thrown upon Müller’s observations appear to be quite unfounded.
[189] From Claus’ observations (No. [448]) it would appear that the respiratory plate is only the exopodite and not, as is usually stated, the coalesced exopodite and epipodite. Huxley in his Comparative Anatomy reserves this point for embryological elucidation.
[190] Fritz Müller has recently (Zoologischer Anzeiger, No. [52]) described a still more abbreviated development of a Palæmon living in brooks near Blumenau.
[191] It has been clearly demonstrated that the majority of land crabs leave the egg in the Zoæa form.
[192] These five maxillipeds correspond with the three maxillipeds and two anterior ambulatory appendages of the Decapoda.
[193] The observations of Brooks (No. [493]) render it probable that the Alima larva leaves the egg in a form not very dissimilar to the youngest known larva.
[194] His paper is unfortunately in Russian.
[195] The Pontellidæ form an exception to this statement, in that they are provided with paired lateral eyes in addition to the median one.
[196] The term Nauplius was applied to the larva of Cyclops and allied organisms by O. F. Müller under the impression that they were adult forms.