of the Fishery Board for Scotland. 203 



Fig. 24. Female (juv.), with vertex tooth, Forfar Loch . . x 53. 



Fig. 25. side view, with bulge at base of posterior spine, Forfar 



Loch . . . x 20. 



Fig. 26. ,, side view, also with bulge, but posterior spine very short, 



Forfar Loch . . . x 20. 



Fig. 27. Female, side view, with posterior spine obsolete, Forfar Loch . x 20. 



Fig. 28. Male ,, Forfar Loch . . . . x 40. 



Fig. 29. Female a common form, Loch Leven . . x 20. 



Fig. 30. ,, ,, posterior spine nearly obsolete, Loch Leven . x 20. 



Fig. 31. „ „ „ „ . x 20. 



Fig. 32. , (juv. ), with vertex tooth, Loch Leven . . x 40. 



Fig. 33. ,, ,, without vertex tooth, Loch Leven . . x 32. 



Fig. 34. side view, adult, with vertex tooth, Loch Lomond . x 26. 



Fig. 34a. Bidentate vertex tooth of another specimen, Loch Lomond . x 26. 



Fig. 35. Female, side view, a normal form, Loch Lomond . . x 26. 



Fig. 49. Post abdomen of female, Forfar Loch . . . . x 60. 



Fig. 51. , ,, „ Loch Lomond . . x 80. 



Daphnia longi.spina, var. nasuta, G. O. Sars. 

 Fig. 36. Female, side view, Loch Doon ..... 

 Fig. 37. ,, ,, (another form), Loch Doon 



Fig. 38. Male ,, Loch Doon ..... 



Fig. 39. ,, front view, Loch Doon, enlarged 

 Fig. 50. Post-abdomen of female, Loch Doon .... 



Daphnia (?) longispina, var. aquilina, G. O. Sars. 

 Fig. 40. Female, side view, Loch Arklet . . . . x 19. 



Fig. 45. Post-abdomen of female, Loch Arklet . . . x 60. 



Fig. 45a. Post abdominal processes of another specimen, Loch Arklet, enlarged. 



Daphnia (?) longispina, var. (?). 



Fig. 41. Female, side view of a common form, Duddingston Loch . x 20. 



Fig. 42. ,, without posterior spine, Duddingston Loch . x 20. 



Fig. 43. Male ,, Duddingston Loch . . . x 34. 



Fig. 44. Head of a scarcely mature female, Duddingston Loch . x 64. 



Daphnia lacustris, G. O. Sars. 



Fig. 23. Female, side view, a common form, Forfar Loch . . x 20. 



o 



x 26. 



x 26. 



x 26. 



x 60. 



