216 ILLINOIS BIOLOGICAL MONOGRAPHS [504 



EXPLANATION OF PLATE 



Fig. 45. Bothrimonus itttermedius, scolex and anterior end, toto preparation, showing fore- 

 most sets of genitalia. 



Fig. 46. Marsipomeira kastata, plerocercoid, siirficial view. 



Fig. 47. Marsipometra hastata, older plerocercoid, surficial view. 



Fig. 48. Clestobotkriutn crassiceps, toto of scolex and anterior end. 



Fig. 49. Clestobothrium crassiceps, toto of young strobila, surficial vi ew. 



Fig. 50. Abothriutn crassum, plerocercoid from CrisHvomer natnaycush, surficial view. 



Fig. 51. Abothriutn crassum, same specimen, lateral view. 



Fig. 52. Abothriutn crassum, young strobila from same host. 



Fig. 53. A bothrium crassum, older strobila from same host. 



Fig. 54. Abothrium crassum, still older strobila, showing dropping off of segments posteriorly. 



