1900.] NEHERTEANS FROM TORRES STRAITS. 331 



EUPOLIA MELANOGRAMMA (p. 826). 



Length over 20 feet. Average breadth f inch. Ground-colour 

 white, with five dorsal and two median ventral black lines ; very- 

 sticky mucus. 



LlNEUS 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 head 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. 



hbv., buccal vessel. i ext., excretory tubules 



bbvc, commissure of buccal vessels, j fr., frontal organ 

 blc, blood-lacuna of cerebral organ. 

 ha., basement-membrane. 

 br., brain. 



cc, ciliated canal of cerebral organ. 

 cgl., cutis-glands. 

 corff., cerebral organ. 

 cu., connective-tissue layer of 

 cutis. 

 ddg., dorsal lobe of dorsal ganglion. 

 dv., median dorsal vessel. 

 ep., epithelium. 

 exd., excretory duct. 



gcorg., gland-cells of cerebral organ. 



hi., vascular head-loop. 



lis., head-slit. 



on., mouth. 

 nice, circular muscles of cutis. 

 mlc., longitudinal muscles of cutis. 

 mlo., outer longitudinal muscle- 

 layer. 



no., lateral nerve-cord. 



ps., proboscis-sheath. 



rh., rhabdites. 

 vdg., ventral lobe of dorsal ganglion. 



Plate LIV. 



Fig. 1 a-e. Cerebratulus torresianus, p. 826. Sections through the cerebral 



organ taken at intervals of 50 fi. X 36. 

 Fig. 2 a-e. G. quecnslandicus, p. 827. Sections through the cerebral organ 



taken at intervals of 50 fi. X 36. 

 Fig. 3. C. torresianus, p. 826. Section through skin of oesophageal region. 



X 128. 

 Fig. 4. C. quecnslandicus, 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 tbe body. 

 Fig. 5. C. quecnslandicus, 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 1*. 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. 



