118 E. C. PUNNETT. 



Fig. ] 5. Cephalothrix aliena. Section through body wall in hinder part of oesophageal region. 

 The greater portion of the section is somewhat dorsal to the level of the nervous stem. 

 X 80. 



Fig. 16. Cephalothrix aliena. Section through anterior part of oesophageal region, x 45. 



PLATE V. 



Fig. 1. Cerebratulus mactdalns. Section through skin of oesophageal region, x 160. 

 Fig. 2. Gerehratidus gardineri. Section through skin in oesophageal region, x 110. 

 Fig. 3. Cerebratulus maldivensis. Section through skin of oesophageal region, x 110. 



Figs. 4 — 7. Sections taken at intervals through the hind brain and cerebral organ of the following 

 species : 



Fig. 4 (o — c). C. gardineri. At intervals of 80 /t. 



Fig. 5 (a — c). C. maculatus. At intervals of 100 /i. 



Fig. 6 (a — c). G. maldivensis. At intervals of 80 /j,. 



Fig. 7 {a — c). C. ischurus. 50 ju. between a and b ; 150 /x, between b and c. 



Figs. 8 — 10. Schematic reconstructions through the anterior end of several Lineidae. The buccal 

 vascular vessels, the oesophageal nerves, the proboscis and its sheath, have, for the sake 

 of simplicity, been omitted. The oesophageal vascular lacunae have also been represented 

 as simple vessels. 



Fig. 8. C. gardineri. x 10. 



Fig. 9. C. maldivensis. x 10. 



Fig. 10. C. maculattis. x 10. 



