Archive image from page 790 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 CRUSTACEA, 775 The biliary apparatus of the Crustacea is of very large size in the Decapocla. The liver is symmetrical (fig. 417), and consists of two halves generally separate one from another, and the whole organ is made up of an agglo- meration of ccecums, which by one of their extremities empty themselves into excretory ducts. These by their union form larger and larger trunks, and the secreted fluid or bile is finally poured by a double channel into the p
Archive image from page 790 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 CRUSTACEA, 775 The biliary apparatus of the Crustacea is of very large size in the Decapocla. The liver is symmetrical (fig. 417), and consists of two halves generally separate one from another, and the whole organ is made up of an agglo- meration of ccecums, which by one of their extremities empty themselves into excretory ducts. These by their union form larger and larger trunks, and the secreted fluid or bile is finally poured by a double channel into the pyloric portion of the stomach. The liver is found to undergo extensive modifications as it is examined in individuals lower and lower in the series; in the Edriophthalmians, finally, we discover nothing except three pairs of bili- ary vessels analogous to those of insects. The liver is not the only secerning organ whose product is poured into the intestine. On each side of the pyloric portion of the stomach, we observe two blind tubular cavi- ties narrow and much elongated in their form, which pour out a whitish fluid (,f,f); and at the point of conjunction of the two por- tions of which the intestine frequently consists, as has been said, there is a third tubular cavity or vessel in all respects similar to these two (fig. 416, g). These tubuli are all wanting in the Astacus fluviatilis, and in the Astacus ma- rinus the single posterior tubulus is the only one found. Nothing positive is known with regard to the uses of the fluid secreted in these tubuli. To conclude, there are two organs of a green colour situated on either side of the oesopha- gus, the structure of which is glandular, and which appear to bear some analogy to the sali- vary glands. B. Of the blood and circulation.—We are altogether without positive information as to the mode in which the nutritious fluid, elabo- rated by the process of digestion, passes from the intestinal canal into the torrent of th
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