. Elementary text-book of zoology. ASCAJCIS. IS3 the hind-end of the male is slightly coiled, and has a pair of External ™'"ute bristles or anal setce protruding from the Features. ^"^^ aperture. The body is of a whitish colour, and it has four lines (a dorsal and ventral and two lateral) along its surface. Fig. 87. Cuticle.^ Ectoderm,, Muscle Cell. -Diagrammatic Transverse Section of Ascaris Megalocephala. {Ad nat.) Dorsal Nerve Cord. Oviduct. Uterus, " Central Nerve The mouth is at the anterior end, surrounded by a dorsal and two lateral lips which bear sens
. Elementary text-book of zoology. ASCAJCIS. IS3 the hind-end of the male is slightly coiled, and has a pair of External ™'"ute bristles or anal setce protruding from the Features. ^"^^ aperture. The body is of a whitish colour, and it has four lines (a dorsal and ventral and two lateral) along its surface. Fig. 87. Cuticle.^ Ectoderm,, Muscle Cell. -Diagrammatic Transverse Section of Ascaris Megalocephala. {Ad nat.) Dorsal Nerve Cord. Oviduct. Uterus, " Central Nerve The mouth is at the anterior end, surrounded by a dorsal and two lateral lips which bear sense-papillae, probably tactile. The anus is a little distance from the posterior end on the ventral surface. Some little way behind the mouth is a minute median ventral pore, the excretory opening. On dissection we find a definite body-cavity* in which lie freely the alimentary and reproductive organs; The mouth leads into a pharynx with muscular walls lined by chitin. The suctorial pharynx opens into a long intestine terminating in the anus. The intestinal epithelium is said to secrete on both surfaces a delicate cuticle. This cavity may be a modified coelom or may be an archicoele : the structure of the excretory organs points to the 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 Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1902
