230 ILLOINIS BIOLOGICAL MONOGRAPHS [SIS 



EXPLANATION OF PLATE 



Fig. 87. Bothriocephalus manubriformif , transection thru anterior region. 



Fig. 88. Bothriocephalus manubrifortnis , cirrus-sac and vaginal bulb from a transection. 



Fig. 89. Bothriocephalus occidentalis, cirrus-sac from a transection. The reference line is 



0.1mm. long. 



Fig. 90. Clestobothrium crassiceps, transection thru the ovary. 



Fig. 91. Abotkrium rugosum, transection thru the ovary. 



Fig. 92. Abotkrium crassum, transection thru the ovary of a specimen from Sdmo solar. 



