File:The physiology of the Invertebrata (1892) (14785076745).jpg

A Larva. a = pharynx. b = oesophagus. c = stomach. d = salivary gland. e = malphigian tubules. f = rectum.
B Imago. a = pharynx. b = oesophagus. c = salivary gland. d = crop. e = stomach. f = malphigian tubules. g = intestine. h = rectum i = caecum

Identifier: cu31924003398538 (find matches)
Title: The physiology of the Invertebrata
Year: 1892 (1890s)
Authors: Griffiths, A. B. (Arthur Bower), 1859-
Subjects: Invertebrates
Publisher: New York, D. Appleton and Company
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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ly acts as a receptacle to store upthe rapidly swallowed food until time is afforded for the foodto be passed on to the true stomach. The gizzard or proventriculus has been described in thelast chapter. It is considered by some to be an internalmasticatory apparatus, but M. Plateau,* considers that theproventriculus of Blatta acts simply as a strainer. The chylific ventriculus may be termed the true stomachof Blatta, for it is probable that digestion is more active inthis than in any other part of the alimentary canal. It islined with epithelium, and often contains peptones. The pyloric caeca, situated in front of the chylific ventri- * See his papers on the digestion in the Myriapoda, Inseota, andArachnida, published in the BuMetin de IAcadSmie Moyale des Scences deBegique, 1874-78. 94 PHYSIOLOGY OF THE INVERTEBRATA. cuius, have been directly proved by the author* to bepancreatic in function. The secretion from these caeca flowsinto the chylific ventriculus, where digestion proceeds.
Text Appearing After Image:
Z o 0. cm tad < ;= II uO K IIII s a •as- II 55 u t; Ou In the carnivorous Lihellula (the dragon-fly) there is nocrop or gizzard, only the chylific ventriculus is present; the* Griffiths, in Proc. Boy. Soc. Edinb., toI. 14, p, 237. PHYSIOLOGY OF THE INVERTEBRATA. 95, fluids within this organ are always slightly alkaline, and aninfusion of about twenty of these organs readily convertedstarch into glucose, and digested fibrin. (&) The Lepidoptera.—Asj an example of this importantorder we describe the physiology of the alimentary canal ofthe larva and imago of Pontia hrassicce (the large whitecabbage butterfly). The alimentary canal of the larva (Fig. 26, a) agreesclosely with the general Lepidopterous type. The mouthopens into a pharynx lined by a dark, firm cuticula, and intothe latter open two ducts from a pair of well-developedsalivary glands. These glands form elongated tubes, gra-dually diminishing in diameter towards the posterior ends.The oesophagus is very narrow and s

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