. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. Fig. 50.âMorphology of Turbellaria. I. Platiaria torva (Muller); m Mouth; g Nerve-ganglion; tf Eyes; iWOvary; ^Testis; ^« Genital opening, a. Planaria â lactea, showing the branched (dendrocoil) intestine. 3. Microscopic larva of Alaur- ilia, a marine Turbellarian. 4. Pilidium, the "pseudembryo" of a Nemertid; a The alimentary canal; b Rudiment of the Nemertid. The Plflnarians have been divided into two sections, as follows:â Section A. âIntestine straight
. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. Fig. 50.âMorphology of Turbellaria. I. Platiaria torva (Muller); m Mouth; g Nerve-ganglion; tf Eyes; iWOvary; ^Testis; ^« Genital opening, a. Planaria â lactea, showing the branched (dendrocoil) intestine. 3. Microscopic larva of Alaur- ilia, a marine Turbellarian. 4. Pilidium, the "pseudembryo" of a Nemertid; a The alimentary canal; b Rudiment of the Nemertid. The Plflnarians have been divided into two sections, as follows:â Section A. âIntestine straight, not branched. Body elongated, rounded, or oval. Section B. Dendroccela.âIntestine branched or arborescent. Body flat and broad. Sub-order II. Nemertida.âThe Nemertida, or " Ribbon- worms," agree in most essential respects with the Planarida. They are distinguished,' however, by their elongated, vermi- form shape, by the presence of a distinct anus, by the posses- sion of a distinct perivisceral cavity, by the absence of an external aperture to the water-vascular system of the adult, and by the fact that the sexes, with one or two exceptions, are distirict. The Nemertida further differ from the other Platyel- tnia in possessing a pseudohsemal system in addition to, and distinct from, the water-vascular system. Reproduction takes place by the formation of true ova, by internal gemmation, or by transverse fission. In Nemertes, however, the egg gives rise to a larva, from which the adult is. 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 Nicholson, Henry Alleyne, 1844-1899. New York : D. Appleton
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