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Show 1900.] NEMERTEANS FROM TORRES STRAITS. 831 EUPOLIA MELANOGRAMMA (P. 826). Length over 20 feet. Average breadth | inch. Ground-colour white, with five dorsal and two median ventral black lines ; very sticky mucus. LINEUS ALBOVITTATUS (p. 826). From the channel between Mer and Danar, Murray Is. Depth 15-20 fathoms. Colour dark green, with a bluish sheen. There is a chevron-pattern on the bead consisting of a white line bordered with pale green. Tail pointed. Length about 158 mm. and breadth about 2*75 mm. EXPLANATION OF THE PLATES. bbv., buccal vessel. ext., excretory tubules. bhvc, commissure of buccal vessels. blc, blood-lacuna of cerebral organ. bm., basement-membrane. Irr., brain. cc, ciliated canal of cerebral organ. cgl., cutis-glands. corg., cerebral organ. cu., connective-tissue layer of cutis. ddg., dorsal lobe of dorsal gaDglion. dv., median dorsal vessel. ep., epithelium. exd., excretory duct. fr., frontal organ. gcorg., gland-cells of cerebral organ. kl., vascular head-loop. lis., head-slit. m., mouth. mcc, circular muscles of cutis. mlc, longitudinal muscles of cutis. mlo., outer longitudinal muscle-layer. nc, lateral nerve-cord. ps., proboscis-sheath. rh., rhabdites. vclg., ventral lobe of dorsal ganglion. P L A T E LIV. Fig. 1 a-e. Cerebratulus torresianus, p. 826. Seotions through the cerebral organ taken at intervals of 50 u. X 36. Fig. 2 a-e. C. queenslandicus, p. 827. Sections through the cerebral organ taken at intervals of 50 u. X 36. Fig. 3. C. torresianus, p. 826. Section through skin of oesophageal region. X 128. Fig. 4. C. queenslandicus, p. 827. Section through skin of oesophageal region showing rhabdites (rh). X 300. Figs. 5, 6. Diagrammatic reconstructions of the various systems in the anterior portion of the body. Fig. 5. C. queenslandicus, p. 827- X 8. Fig. 6. C. torresianus, p. 826. X 8. # marks the spot where the median dorsal vessel leaves the proboscis-sheath. PLATE LV. Fig. 7 a-e. C. haddoni, p. 829. Sections through the cerebral organ taken at intervals of 100/u. X 36. Fig. 8. C. haddoni. Section through skin of oesophageal region. X 88. Fig. 9. Diagrammatic reconstruction of anterior portion of C. haddoni. X 4. |