88 
PACIFIC SCIENCE, Vol. XX, January 1966 
Figs. 17-23. Keralina opisthopterus n. gen., n. sp. 17, Complete worm, ventral view; 18, anterior region, 
dorsal view; 19, clamp, ventral view; 20, another clamp, ventral view; 21, male genital pore showing the 
armature of recurved spines; 22, ovarian region, ventral view; 23, egg. 
muscle fibers extending from it to the postero- 
lateral region of the pharynx. Pharynx large, 
thick, muscular, oval, 63 X 42 g-12 6 X 63 p 
with a longitudinal row of semicuticularized 
teethlike structures on each side projecting into 
the axial lumen; in one of the specimens the 
pharynx is divided into an anterior muscular 
and a posterior glandular portion. The pharynx 
and oral pouches occupy the greater portion of 
the neck region (Fig. 18). Oesophagus short 
and unbranched, bifurcating into the crura in 
front of the vagina; lumen of the crura at the 
bifurcation region comparatively large; each 
crus with very long horizontally parallel outer 
branches with short secondary branches which 
do not anastomose; intercrural branches short 
and directed obliquely backward but not con- 
fluent with those of the opposite side; posteri- 
orly the two crura unite in front of the haptor 
and the united distal end expands into a vesicu- 
lar structure from the periphery of which short 
branches lead to the base of each clamp. 
Haptor closely resembling that of Cyclo- 
bothrium Cerf., but with a complete circlet of 
clamps; connected in the center to the narrow 
posterior extremity of the body. Clamps eight in 
number, squarish or polygonal, 126 X' 147 p- 
210 X 210 p, and arranged radially along the 
periphery of the circular haptor; clamp pedun- 
cles very short with axial muscles extending 
