. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. Les crustacés. Fig. 413. Fig. 414. Fig. 415 773. Fig. 412, de l'aspect ventrale thoracique céphalo-partie de l'Dichelestion. un tronc, ou ; b, maxillse sucker. Fig. 413, le coffre ou d'un meunier, grossie, thelabrum ; b, les mandibules. Fig. 414 Sf 415, l'maxilles. nultimate articulation (les pinces, tenailles, ou cheliferous extrémités). L'occasion d'extrémité se termine dans deux articulations ne présentant aucun genre de développement inhabituel, mais le dernier, termi- nées par une pointe et armés de dents ou seme, retourne

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. CRUSTACEA. Fig. 413. Fig. 414. Fig. 415 773. Fig. 412, Ventral aspect of the cephalo-thoracic portion of the Dichelestion. a, trunk or sucker ; b, maxillse. Fig. 413, The trunk or sucker magnified, a, thelabrum; b, the mandibles. Fig. 414 Sf 415, The maxillae. nultimate articulation (the claws, pincers, or cheliferous extremities). The extremity occasionally terminates in two articulations presenting no kind of unusual development, but the last of which, termi- nated by a sharp point and armed with teeth or seme, returns upon the preceding one, so as to form a kind of hook or pincer, opening in the opposite direction, (the sub-cheliform extremities of the Squilles and Crevettina;). Lastly, these extremities frequently terminate in a simple acute angle of which the animal can make no use save in locomotion. In the Sucking Crustacea, which live parasi- tically on other animals and feed by sucking their blood, the structure of the oral apparatus is extremely different.* Certain pieces which must be considered as analogous to the labium and languette, are elongated, so as to form a trunk or cylindrical tube, of variable length, adapted for sucking, and in the interior of which are lodged the mandibles, now pro- longed so much that they form two slender and pointed processes the extremities of which serve as a lancet. The appendages which in the masticating Crustacea constitute the jaws, here continue rudimentary, and the three pairs of limbs which in the Decapoda complete the oral apparatus, under the name of maxillary extremities, are here transformed into organs of prehension, of different forms, by means of which the parasite attaches itself to its victim. In the whole of the Crustacea the intestinal canal presents two openings, the mouth and * See our " Recherches sur 1'Organization de la Bouche des Crustaces Suceurs, " Ann. des Sc. Nat. t. 28; Burmeister's Beschreibung einiger neuen

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