The digestive tube in the Polyplacophora, which are herbivorous, is longer than the body, and thrown into a few coils, the anus being median and posterior.
A crop-like dilatation of the gut and a recurved intestine, embedded in the compact yellowish-brown liver, the ducts of which open into it, form the rest of the digestive tract and occupy a large bulk of the visceral hump. The buccal region presents a pair of shelly jaws placed laterally upon the lips, and a wide range of variation in the form of the denticles of the lingual ribbon or radula.
Whether bacteria will be destroyed or not after they have been ingested by the leucocytes will depend upon the digestive powers of the latter, and these probably vary in different species of animals.
Food is imbibed through the skin from the digestive juices of the host in which the Acanthocephala live.
Some have such a vast appetite for the former commodity, that is, the news, and such sound digestive organs, that they can sit forever in public avenues without stirring, and let it simmer and whisper through them like the Etesian winds, or as if inhaling ether, it only producing numbness and insensibility to pain--otherwise it would often be painful to bear--without affecting the consciousness.
It has been proved that the secretion contains a digestive ferment capable of rendering proteid matter soluble.
Indeed he was so much prepossessed in favour of a classification based on the structure of the digestive organs that he could not bring himself to consider vocal muscles to be of much taxonomic use, and it was reserved to Johannes Muller to point out that the contrary was the fact.
The digestive tract of Patella offers some interesting features.
B, Digestive gland from interior A, B, and C magnified about of pitcher, in pocket-like deI oo diameters.
The liver is no longer a compact organ opening by a pair of ducts into the median digestive tract, but we find very numerous hepatic diverticula on a shortened axial tract (fig.