PLATE XXXIII. 



page 



Fig. 37. Arcella vulgaris, oral view 204 



Fig. 38. Arcella vulgaris, side view 204 



Pig. 39. Arcella vulgaris, dorsal view •.04 



Fig. 40. Arcella vulgaris, tipped 204 



Fig. 41. Arcella vulgaris, oral view 204 



Fig. 42. Arcella discoides, oral view 204 



Fig. 43. Arcella discoides, side view 204 



Fig. 44. Arcella vulgaris, side view 204 



Fig. 45. Arcella vulgaris, oral view 204 



Fig. 46. Arcella vulgaris, side view 204 



Fig. 47. Arcella vulgaris, top view 204 



