. A catalogue of the British non-parasitical worms in the collection of the British Museum. Worms. antennae. In the suhcephalous and acephalous tribes eyes are gene- rally absent. They are always sessile, simple, and immoveable. AntenncB (figs. 8 « & 11 «j exist only in cephalous genera. They are soft, setaceous filaments, varying in number from one to five, and distinguished from the other appendages by arising directly from the head. They are usually jointed at the base, and are not retractile. Palpi (fig. 8 pi) are seldom found. They are also soft filaments, en- tire or jointed, and ori
. A catalogue of the British non-parasitical worms in the collection of the British Museum. Worms. antennae. In the suhcephalous and acephalous tribes eyes are gene- rally absent. They are always sessile, simple, and immoveable. AntenncB (figs. 8 « & 11 «j exist only in cephalous genera. They are soft, setaceous filaments, varying in number from one to five, and distinguished from the other appendages by arising directly from the head. They are usually jointed at the base, and are not retractile. Palpi (fig. 8 pi) are seldom found. They are also soft filaments, en- tire or jointed, and originate externally from the sides of the oral orifice. Tentacula (figs. 8 ^ & 9 i^) are the soft setaceous or filiform non- retractile processes which arise from each side of the cephalic segments in pairs, and spread laterally. They are sometimes jointed; often very long, and remarkably contractile in the acephalous genera. The Month (fig. 11 m) is underneath the head, and is a round or transverse entrance to the oesophagus and intestinal canal. It has usually a plain margin. In the acephalous genera it is terminal and emaxillary, but occasionally furnished with external tentacles. In the suhcephalous it is subterminal or ventral; and in the cephalous nearly terminal, looking forwards horizontally. The Mouth in the cephalous tribe is almost always furnished with. 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 British Museum (Natural History). Dept. of Zoology; Johnston, George, 1797-1855. London : Printed by order of the Trustees
Size: 1716px × 1457px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, booksubjectworms, bookyear1865
