226 J. MURRAY ON PHILODINA MACROSTYLA, EHR. 



to draw from nature are all drawn to one scale, so that relative 

 sizes may be compared. The two species, macrostyla and aculeata, 

 do, however, vary greatly in size. The figures copied from Gosse, 

 Pritchard, and Janson, and the details of parts, are not drawn to 

 scale, but are made of any convenient size. 



Plate 15. 



1. P. aculeata, commonest Scottish form. 



2. P. f macrostyla, type, feeding. 



3. P. tuberculata (Gosse) feeding. 



4. ,, ,, section of trunk, with plates. 



5. P. spinosa (Bryce) dorsal view, feeding. 



6. ,, „ ventral view, partly contracted. 



7. P. macrostyla, lateral view of antenna. 



Plate 16. 



8. P. aculeata, var. crystallina, var. nov. 



9. The same, ventral view, contracted. 



10. P. macrostyla, jaws. 



11. P. aculeata, with eight hemispherical knobs. 



12. „ „ with eight spines and two knobs. 



13. ,, „ with eight short, thick spines. 



14. ,, ,, lateral view of the same form. 



Plate 17. 



15. P. macrostyla, type, creeping. 



16. P. aculeata, var. medio- aculeata, lateral view. 



17. „ „ „ „ dorsal view. 



18. P. tuberculata, section of neck. 



19. P. onacrostyla, rostrum with its various processes. 



20. ,, ,, lateral view of rostrum. 



21. P. aculeata, after Gosse. 



22. ,, „ after Pritchard and Ehrenberg. 



23. „ ,, with ten spines, no lateral. 



24. P. macrostyla, lateral view of foot. 



25. „ ,, ventral view of foot. 



26. P. aculeata, var. medio-aculeata, after Janson. 



Journ. Quekett Microscopical Club, Ser. 2, Vol. X., No. 62, April 1908. 



