PORIFERA. III. 



"3 



10. Surface with low warts or long papillae n. 



— Surface simple 12. 



n. Surface with low warts, dermal strongyla long and straight verrucosa 



— Surface with long papillae, dermal strongyla robust with a double curvature. . . filifcra Schmidt. 



12. The acanthostyli only spined on the head norvcgica Thiele. 



— The acanthostyli spined in the lower half part mollis 



13. The chelae strongly, nearly semicircularly curved curvichela 



— The chelae less strongly curved 14. 



14. The dermal spicules polytylote, chelae large, 0-052— 0-064 mm , the end-parts some- 

 what recurved ritgosa 



— The dermal spicules not polytylote, chelae smaller 15. 



15. The acanthostyli strongly spined in the whole length splenium 



— ■ The acanthostyli not entirely spined 16. 



16. The large acanthostyli spined towards the apex, chelae 0-032— 0-037 ram , the free 



part of the shaft about one third of the length tenuicula 



— The large acanthostyli at most spined in the lower half part 17. 



17. The small acanthostyli distinctly curved 18. 



— The small acanthostyli straight 19. 



18. The acanthostyli reaching to o-65 mm , chelae somewhat strongly curved, 0-035— o-044 mm similis 



— The acanthostyli reaching to 0-42 mm , chelae less curved, 0-037""" paupertas Bow. 



19. The acanthostyli long, reaching to 0-95 mm , the dermal spicules slightly tending 



towards tornota nummulus 



— The acanthostyli shorter, the dermal spicules pure strongyla 20. 



20. The acanthostyli reaching to 0-63 mm , the dermal strongyla 0-35— 0-52 mra , surface 



with papillae sty lata 



— The acanthostyli reaching to 0-38 mm , the dermal strongyla 0-26 — 0-32 mm , surface 

 simple dubia 



21. The dermal spicules diactinal (at all events not distinctly monactinal) 22. 



— The dermal spicules monactinal 42. 



22. The dermal spicules tornota 23. 



— The dermal spicules oxea or tylota 32. 



23. The dermal spicules centrotylote tornota lanci/era Tops. 



— The dermal spicules not centrotylote 24. 



24. The tornota with unequal ends 25. 



— The tornote with equal ends 26. 



25. The large acanthostyli only spined at the base, o-24 mm , chelae o-oi8 mm prostrata Thiele. 



— The large acanthostyli a little more spined, 0-45 mm , chelae 0-03 mm Peachii Bow. 



26. The large acanthostyli spined in about the whole length 27. 



— The large acanthostyli spined only near the base 31. 



27. The chelae of ordinary shape 28. 



— The chelae extraordinarily flat platy chela 



28. Surface with papillae, tornota o-36 mm , chelae 0-024™"' mamviillar/sFTstdt. 



— Surface simple 29. 



29. The acanthostyli reaching to 0-53 mm , the tornota 0-17— 0-22 mm , chelae with slightly 

 recurved end-parts 0-021 — 0-054 mm perforata 



— The acanthostyli not reaching over o - 35 mm 30. 



The Ingolf-Expedition. VI. 3 15 



