. Elementary text-book of zoology [electronic resource]. Zoology. ANNO LATA. 179 CHAPTER XVI. PHYLUM ANNULATA. POLYCxORDIUS. ARENICOLA. HIRUDO. LUMBRICUS. I.—POLYGORDIUS. g. 104.—POLYGORDIUS Neapolitan US. Prostomlal Tentacles. W. Anus. ntire annual seen from dor- sal aspect X 5. (After Fkaipont.) Phylum Sub-Phylum Class - Annulata. Annelida. Archiannelida. Polygordilis neapolilaniis is a small delicate marine inch) worm, of elon- gated body, found in the sand at moderate depths. It is of a pale pink hue. At the anterior end are a pair of small tentacles, the prostomial tentacles, covered with
. Elementary text-book of zoology [electronic resource]. Zoology. ANNO LATA. 179 CHAPTER XVI. PHYLUM ANNULATA. POLYCxORDIUS. ARENICOLA. HIRUDO. LUMBRICUS. I.—POLYGORDIUS. g. 104.—POLYGORDIUS Neapolitan US. Prostomlal Tentacles. W. Anus. ntire annual seen from dor- sal aspect X 5. (After Fkaipont.) Phylum Sub-Phylum Class - Annulata. Annelida. Archiannelida. Polygordilis neapolilaniis is a small delicate marine inch) worm, of elon- gated body, found in the sand at moderate depths. It is of a pale pink hue. At the anterior end are a pair of small tentacles, the prostomial tentacles, covered with fine setce. They are parts of the prostoniiii/ii, a lobular process lying anterior and dorsal to the mouth. Immediately behind the mouth is the peristoniiitin., a laige and well-defined segment. The rest of the body is divided externally and internally into a series of segments. 'J he terminal or anal segment is swollen and bears the anus. On its broadest part this segment bears a ring of papillce. The mouth leads into an oesophagus which continues as a simple intestine terminating in the anus. The ectoderm is .a simple epithelium with unicellular glands ; it secretes a thin cuticle. Below it the mesoderm forms a well- developed system of longitudinal muscles. Inside them is the delicate coelomic epithelium, lining a spacious ccelom. This is divided by dorsal and ventral mesen- teries, in which are simple blood-vessels, and by transverse septa between each segment. Each segmental part of the coelom opens by simple paired tubes (or iiephridia) to the exterior. The nervous system is still part of the ectoderm. It consists of a brain in the prostomium,. 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; Parsons, John Herbert, Sir, 1868-1957, donor; S. H. Lazarus (Firm); University Co
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