104 THÉEL, NORTHERN AND ARCTIC INVERTEBRATES. I. SIPUNOULIDS. 
Plate II. 
Fig. 14. Phascolosoma vulgare (BLAINVILLE) = Ph. papillosum (THOMSON), KOREN and DANLIELSSEN. 
Fig. 14. Three isolated hooks from the type of KorREN and DANIELSSEN. 240. Bergen Fjord. 
Figs. 15—18. Phascolosoma Trybomi n. sp.(!). The Sound. 
Fig. 15. The animal opened along the dorsal surface. Natural size. 
a. anus. — de. downwards running intestinal twists. — dr. dorsal retractors. — g. genital 
festoons. — i. intestinal spiral. — m,. muscles fixing the intestine. —- n. nerve-cord. — 0e. 
oesophagus with its vessel. — sm. spindle-muscle. — p. proboscis withdrawn. — s. segmental 
organs. — vr. ventral retractors. — uc. intestinal twists running upwards. 
? 
» 16. A piece of the skin from the anterior part of the trunk. 56. 
» 17. A piece of the skin from the middle of the trunk. 36. 
» 18. A piece of the skin from the posterior end of the trunk. 56. 
Figs. 19—26. Phascolosoma procerum MösBivs. Gullmar Fjord. 
Fig. 19. The animal. + 
» 20. The posterior extremity of another specimen. + 
» 21. The foremost part of the proboscis with the tentacles extended and with the sensory 
pillow visible. Dorsal view. 30. 
» 22. The foremost part of the proboscis. Side view. 30. 
f. annular fold limiting the anterior smooth space. — m,. mouth. — so. sensory organ on the 
dorsal surface. 
Fig. 23. The skin of the trunk. 35. 
» 24. A papilla of the body-wall. HSide-view. 350, 
» 25. The same, seen from above. 350. 
» 26. The body cut open along the dorsal surface, though slightly off its middle line. + 
a. anus with its fixing muscles. — de. intestinal twists running downwards. — g. genital festoons. 
— on. nerve-cord. — oe. oesophagus. — s. segmental organs turned forwards. — v. vessel with 
side-branches. -— vr. ventral retractors. — uc. intestinal twists running upwards, 
