J. MURRAY ON WATER-BEARS, OR TARDIGRADA. 



191 



Order ARCTISCOIDA Schultze (51). 



Family Xenomorphidae Perty (26). 



1. Genus Echiniscus Schultze (50). 



A. Segments V. and VI. separate. 



1. E. suillus Ehr. (6). 



2. E. novaezeelayidiae Richters 



(39). 



3. E. imherhis Richters (42). 



4. E. hispinosus Murray (24). 



5. E, conifer Richters (33). 



6. E. pulcher Murray (25). 



7. E. victor Ehr. (6). 



8. E. islandicus Richters (36). 



9. E. borealis Murray (22). 

 10. E. cornutus Richters (37). 



B. Segments V, and YI. joined. 

 a. No processes except those on the head. 



11. ^. intermedius ^lurray [25). 



12. E. arctomys Ehr. (6). 



13. E. kerguelensis Richters 



(32). 



14. E. wendti Richters (31). 



15. E. sylvanus Murray (25). 



16. E. viridis Murray (25). 



17. E. elegans Richters (37). 



18. E. reticidatus Murray (14).. 



19. E. Tnacronyx Richters (42). 



20. E. higranidatus Richters- 



(42). 



21. E. spiculifer Schaudinn (47). 



22. ^. tessellatus Murray (25). 



b. Only dorsal processes on body. 

 23. E. gladiator Murray (14). | 24. E. canade7isis Murray (25). 



c. Lateral processes, spines or spicules only. 



25. E. calcaratus Richters (41). 29. E. spiniger Richters (35). 



26. E. spinulosus Doy^re (3). 30. E. duboisi Richters (30). 



27. ^. joerarmaiits Murray (24). 31. ^. a/ricnMs Murray (24) 



28. E. crassispinosus Murray 



(24). 



32. E. aculeatus Plate (27). 



d. Lateral setae and sublateral spicules. 



33. ^. 6e/^ermanmSchultze(50). 



34. E. spitsbergensis Scourfield 



(53). 



35. E. creplini Schultze (51). 



36. E. oihonnae Richters (31). 



