Archive image from page 770 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 CRUSTACEA. 755 X Talitra, Saltator magnified. a, head; b, thorax composed of seven distinct rings ; c, abdomen composed also of seven dis- tinct rings. equal series of seven, each of which may be held as corresponding with one of the three regions. This law of composition is observed to obtain not only among the more simple species, where the rings generally resem- ble each other most closely, but its influence may be remarked among the most complicated als
Archive image from page 770 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 CRUSTACEA. 755 X Talitra, Saltator magnified. a, head; b, thorax composed of seven distinct rings ; c, abdomen composed also of seven dis- tinct rings. equal series of seven, each of which may be held as corresponding with one of the three regions. This law of composition is observed to obtain not only among the more simple species, where the rings generally resem- ble each other most closely, but its influence may be remarked among the most complicated also, and amidst exceptions and contradictions in appearance the most obvious. The head or cephalic region includes the principal organs of sense as among the Vertebrata, the com- mencement of the apparatus subservient to digestion, and the appendages destined to seize and masticate the food. The thorax, strictly speaking, forms no cavity distinct from the pre- ceding, but is its continuation; the part espe- cially designated thorax, however, is that which is included from front to back between the head and the beginning of the abdomen, and is formed by the rings to which the extremities serving for locomotion are attached. This mid- dle portion of the general cavity of the body contains almost the whole of the viscera. As to the abdomen, it succeeds the last of the thoracic rings, distinguishable by the presence in it of the orifices of the male organs of gene- ration ; the appendices attached to it do not commonly attain any considerable size, and do not serve in a general way as organs of locomo- tion ; to conclude, nothing is found in its inte- rior save muscles and the terminal portion of the intestinal canal, the anal orifice of which exists in the last of the abdominal series of rings. These three portions of the tegumentary ske- leton are not always equally distinct, and their respective limits may even vary, for we occa- sionally observe two or three of the foremost tho
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