Archive image from page 787 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 Limulus polypheaua, (ventral aspect.) a, carapace; b, frontal portion of the carapace; c, thorax ; d, chelifera; e,f, y, h, i,.j, legs, the basilar portions of which surround the mouth and act as mandibles ; /, under-lip ; m, branchial or lamellii'orm appendages ; n, mouth. itself under the shape of two thin and much expand- ed laminae which serve as a kind of broad operculum to cover the whole of the oral apparatus. Starting from this complication of structur
Archive image from page 787 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 Limulus polypheaua, (ventral aspect.) a, carapace; b, frontal portion of the carapace; c, thorax ; d, chelifera; e,f, y, h, i,.j, legs, the basilar portions of which surround the mouth and act as mandibles ; /, under-lip ; m, branchial or lamellii'orm appendages ; n, mouth. itself under the shape of two thin and much expand- ed laminae which serve as a kind of broad operculum to cover the whole of the oral apparatus. Starting from this complication of structure, the greatest in the series, we shall see the ap- paratus degenerating by successive degrees, at the same time that in any given group its com- position presents much less of constancy or regularity. The Sergestes among the Decapods have one pair of maxillary feet fewer than the highest number; the Edriophthalmians have no more than a single pair, whilst in the Thysanopoda and the generality of the Sto- mapoda the number of oral appendages they are terminated. The most favourable disposition to these ends is observed in the lobsters, crabs, &c.; in a word in a very great number both of the short and long-tailed De- capods, in which the anterior thoracic extre- mities terminate in pincers of greater or less strength, armed with teeth and sharp hooks which give them increased powers of pre- hension. This form results mainly from the state of extreme development in which the pe- nultimate articulation frequently occurs, and its assumption of the shape of a finger, by the prolongation of one of its inferior angles. Against the finger-like process thus produced, which is of great strength and quite immove- able, the last articulation can be brought to bear with immense force, as it is put into mo- tion by a muscular mass of great size, and in relation with the extraordinary size of the pe-
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