174 



CESOPHAGOSTOMA COLUMBIANUM, Curtice. 

 Plate XXIV. 



Fig. 1. Adult male, X9, Fig. la, uaturul .size. 



Fig. 2. Adult female, xO, Fig. 2a, natural size. 



Fig. 3. Cephalic eud of adult, ventral view: a, head; h, cesophagus ; c, lateral 



canals opening on head; d, unicellular glands and ducts uniting and 



emptying at e, the ventral oriHce; /, a fold of the skin which forms a hall' 



» ring on the ventral side of the neck ; the orifice e opens uucer it ; «/, g, two 



pointed neck papilhe ; /(, /(, narrow membranous wings; i, intestine. 



Fig. 4. Caudal end of adult female lateral view, x45 (about) : a, anus; b, vulva; c, 

 vagina; d, d, uteri ; e, e, oviducts; f,f,f, loops of the ovaries ; i, intestine. 



Fig. 5. Head : a, mouth ; b, b, papilhe of the two lateral ducts ; c, c, two of the four 

 acnte, pointed papilhe opening on the head ; d, d, cross-section of cavity of 

 the head ; e, e, cross-section of a circular canal, which runs around the base 

 of the head ; /, chitinons .armature of the head ; (/, tcsophagus ; h, its three 

 chitinous supports. 



Fig. C. Chitinous armature, top view : a, chitinous ring ; b, outer teeth ; c, inner 

 teeth; d, triradiate pharyngeal oritice; e, c, e, the ends of the (esophageal 

 rods. Four of the outer teeth have been removed to better show the inner 

 row. A side view of this apparatus is presented in Fig. 5, 



Fig. 6rt. Top view of teeth. 



Fig. Go. Side view of teeth and basal support. 



Fig. 7. The bursa spread out : «, ventral rib ; b, ventrolateral; c, lateral; d, dorso- 

 lateral ; e, dorsal ; /, 'the eloacal orifice with two papilhe behind. 



Fig. 8. Spicula of male, composed of a chitinous tube surrounded by a membrane 

 with a narrow wing. 



Fig. 8a. Portion of spiculum. 



Fig. I). Eggs: a, a, as they appear when deposited ; b, eggs in nterus. 



Fig. 10. Bursa of male, side view: a, a, a, ribs ; />, 8i)icuhi ; c, c, anal papilla?. 



Fig. 11. Head, top view : a, mouth ; b, b, lateral papilhe ; c, one of the four acute 

 papillae. 



