. Cassell's natural history. Animals; Animal behavior. of sight is peculiar to tlie wliole class. Even in those exceptional cases in which the eyes are aborted, we tind that in the earlier and larval stages of their existence the parasitic and sedentary forms possessed eye;., and it is only as the eflect of a kind of retrograde metamorphosis which the animal undergoes that the organs of vision disappear in the adult. '• The Brown Shrimp " {Vrangon vulgaris) seems peculiarly an estuarine form, being taken in large quantities in Morecambe Bay, Lancashire, the Lynn Wash on the Lincolnshire c
. Cassell's natural history. Animals; Animal behavior. of sight is peculiar to tlie wliole class. Even in those exceptional cases in which the eyes are aborted, we tind that in the earlier and larval stages of their existence the parasitic and sedentary forms possessed eye;., and it is only as the eflect of a kind of retrograde metamorphosis which the animal undergoes that the organs of vision disappear in the adult. '• The Brown Shrimp " {Vrangon vulgaris) seems peculiarly an estuarine form, being taken in large quantities in Morecambe Bay, Lancashire, the Lynn Wash on the Lincolnshire coast, the Thames from Gravesewl to the sea, and in the of the Seine, especially near Honfleur. It is of a drab colour, dotted over with brown spots, and it does not become red by boiling as most other Crustaceans do. Its greatest length is two inches and a half (Fig. 27). The absence of the prominent serrated beak or rostrum, so marked a character in all the Pakemoiiida; (Prawns and Shrimps proper), at once enables the collector to separate the Crangonida; tlierefrom. The chelse of the fore hand are present in Palwmou but absent in Crangou, in which the fixed thumb is rudimentary. An interesting little shrimp-like Crustacean, named Alpheus, which occurs only rarely off the English coast, but is abundant on the shores of Guernsey, Herm, and other of the Channel' Islands, and one species in particular of which, the Aljjhevs ruber, is of a bright pink or salmon colour, has one claw of the fii-st pair much more largely developed than the other, whilst the second pair are weak, slender, and many-jointed. This character in the second pair of legs is also observable in the genus Nika, closely allied to Alpheus. All the members of this family (A Ipheadne) are remarkable for the loud clicking noise which they habitually emit. It does not seem certain whether this sound, which is always accompanied by a sudden opening of the great claw to the fullest extent, is produced by imp
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