. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. DIGESTIVE ORGANS OF INSECTS. 187 principal varieties, selected from those in which the leading characters of structure are most strongly marked. I shall, with this view, exhibit, first one of the simplest forms of the alimentary organs, as they occur in the 3Iantis religiosa, (Linn.) which is a purely carnivorous insect, belonging to the order of Orthop- tera. Fig. 317 represents those of this insect, freed from their attachments, and separated from the body
. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. DIGESTIVE ORGANS OF INSECTS. 187 principal varieties, selected from those in which the leading characters of structure are most strongly marked. I shall, with this view, exhibit, first one of the simplest forms of the alimentary organs, as they occur in the 3Iantis religiosa, (Linn.) which is a purely carnivorous insect, belonging to the order of Orthop- tera. Fig. 317 represents those of this insect, freed from their attachments, and separated from the body. The whole canal, as is seen, is perfectly straight: it commences by an oesophagus (o), of great length, which is succeeded by a gizzard (g) ; at the lower extremity of this organ the upper hepatic vessels (b, b), eight in number, and of consi- derable diameter, are inserted : then follows a por- tion of the canal (d), which may be regarded either as a digesting stomach, or a chyliferous duodenum: farther downwards, the second set of hepatic vessels, (h h), which are very numerous, but as slender as hairs, are received; and after a small contraction (n) there is again a slight dilatation of the tube (c) before it terminates. The alimentary canal of the Cicindela campestris, (Linn.) which preys on other insects, is represented in Fig. 318; where we see that the lower part of the oesophagus (o), is dilated into a crop (p), suc- ceeded by a small gizzard (g), which is provided for the purpose of bruising the elytra, and other. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Roget, Peter Mark, 1779-1869. London : W. Pickering
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