. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE Tit ACHE AT A. 493 light equal in iuteusity to that of the Firefly with the espenili- tare of as little euerg3% The digestive tract is as a rule much more complicated than ill other classes of Tracheates aud is generally more or less twisted or contorted in the abdominal region, so that usually it is longer than the body. The mouth is bounded in front by a usually large upper lip or labrum, generally described with the mouth-parts, but distinguished from them in
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). TYPE Tit ACHE AT A. 493 light equal in iuteusity to that of the Firefly with the espenili- tare of as little euerg3% The digestive tract is as a rule much more complicated than ill other classes of Tracheates aud is generally more or less twisted or contorted in the abdominal region, so that usually it is longer than the body. The mouth is bounded in front by a usually large upper lip or labrum, generally described with the mouth-parts, but distinguished from them in not representing a pair of appendages. The anterior portion of the intestine, the fore-gut, is ectodermal in origin ah as. Fig. 227.âStructure op Butterfly, Danais archippus (after Buroess). a â -= ttiiteuim ag = accessory gland. ah = accessory heart. an = abdominal ganglion. be = bursa copulalrix. e â crop. cc = canal uniting be aud oviduct. ce = cerebral ganglion. h = heart. I = thoracic limbs. mv = Malpighian tubules. t)cl = oviduct. ov = ovary. ph =z pharynx. pi = palp. s = stomach. sg = salivary gland. tg = thoracic ganglion. I-TIT = thoracic segments. 1-9 = abdominal segments. as in other Tracheates and consists of a mouth-cavity into which, or in its neighborhood, the ducts of one or more generally well-developed salivary glands (Fig. 227, .vr/) open. The secretion of these glands varies considerably in different forms, one of the pairs present in the larva) of "the Biitterflies and certain Moths being transformed into silk- spinning glands, the silk of the Silkworm being a product of their activity. When digestive the secretion seems to have a peptonizing effect as well as the power of transforming starch into suLmr, jiiid is consequently of fongidorable diges- tive importance. The mouth-cavity opens behind into an. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appe
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
