230 ILWINIS BIOLOGICAL MONOGRAPHS (518 



EXPLANATION OF PLATE 



Fig. 87. Bothriocephaliis manuMformis , transection thru anterior region. 



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



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



0.1mm. long. 



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



Fig. 91. Ahothrium rtigosum, transection thru the ovar>'. 



Fig. 92. Abothrium crassum, transection thru the ovary of a specimen from Salmo salar. 



