PLATE VI. 



Ascaris ardea; (camera lucida drawings; scale of enlargement is indicated by a line from each drawing). 



FIG. 1. Lateral view of anterior end, showing two of the lips (partly 

 in profile) and two of the interlabia. 



FIG. 2. Frontal view of the head, showing the dorsal lip below and 

 to the left. 



FIG. 3. Internal aspect of dorsal lip and two interlabia, showing 

 details of pulpa of lip. 



FIG. 4. Tail of female. 



FIG. 5. Ovum, above showing the pitted external surface of the 

 shell, and below showing the segmented interior. 



FIG. 6. Ventral surface of male tail. (Note the second pair of 

 papillae from tip of tail as uncertain.) 



FIG. 7. Lateral view of tail of male. 



PLATE VII. 



Oxyuris microtyphlon and Oxyuris megatyphlon: (camera lucida drawings; scale of enlargement is indicated for each by a line). 



FIG. 1. Ovum of 0. microtyphlon. 



FIG. 2. Ovum of 0. megatyphlon (same scale, drawn in outline for 

 comparison). 



FIG. 3. Frontal view of head of 0. microtyphlon, showing the three 

 lips and their papilla-. 



FIG. 4. Ventral view of tail of male of 0. microtyphlon (to the left 

 at the tip of the tail is a lateral view of the same for comparison; 

 dotted lines connect identical structures) : a, cuticle, showing the 

 transverse striations; 6, intestine; c, anterior lip of cloaca; d, posterior 

 lip of same ; e, postcloacal papilla? ; /, postcloacal spinous support of 

 tip of tail, bidigitate at its free end ; g, larger intracuticular spine in 

 tip of tail; h, spicule; i, body cavity. 



FIG. 5. Female example of O. microtyphlon: a, anus; v, vulva; o, 

 ova in uterine canal; 6, esophageal bulb; e, esophagus. The length of 

 the specimen has been indicated by lines drawn into the body of the 

 worm at intervals of 1 mm. from the head posteriorly. 



FIG. 6. Tail of a non-gravid female, showing the closer relation 

 between the anus (a) and vulva (v) than in the preceding. 



FIG. 7. Male specimen of O. microtyphlon (same enlargement as 

 Fig. 5, for comparison of size of male and female): e, esophagus; 6, 

 bulb of esophagus; i, intestine; s, spicule. (Length marked at milli- 

 meter intervals from head posteriorly.) 



FIG. 8. Tail of male 0. microtyphlon with spicule partly protruded: 

 i, intestine; s, spicule. 



FIG. 9. Tracing of tail of male O. megatyphlon from Schneider. 



FIG. 10. Tail of male 0. megatyphlon from author's material. 



FIG. 11. Tail of female 0. megatyphlon (author's material), showing 

 relative position of anus (a) and vulva (v). 



FIG. 12. Head end of O. megatyphlon (author's material). 



PLATE VIII. 



Globocephalus ardece: (camera lucida drawings; scale of enlargement indicated for each drawing by a line). 



FIG. 1. Frontal view of head showing mosaic appearance, the mouth 

 and its chitinous ring and intra-oral spines (!), and showing faintly the 

 armature at the base of the mouth cavity. 



FIG. 2. Armature of three curved chitinous plates (a) set in the 

 floor of the mouth about the esophageal opening (c), and the three- 

 sided chitinous ring (b) about the esophageal orifice. 



FIG. 3. Head end, showing (a), mouth; (b), mouth cavity; and (c), 

 armature; (d), esophagus and cervical papillae (c); and the cuticular 

 collar (/) about the head and first part of neck. 



FIG. 4. Tail of female, showing (a) anus and (6) vulva. 



FIG. 5. Ova. 



PLATE IX. 



Spiroptera incerta: (camera lucida drawings; the scale of enlargement is indicated for each drawing by a line). 



FIG. 1. Low amplification of a female worm, showing position of 

 vulva (F), the divisions of the esophagus (0), position of anus (A), 

 and the intestine (/). 



FIG. 2. Head end, showing cuticular expansions. 



FIG. 3. Transverse section of anterior end, showing cuticular ex- 

 pansions. 



FIG. 4. Frontal view of head, showing (o), lateral toothed lips; 

 (b), dorsolateral, and (c), ventrolateral (submedian) lips; (e and /), 

 dorsal and ventral tooth-like structure; and (g), outline of oral 

 orifice. 



FIG. 5. Longitudinal view of head end, showing (), lateral lip; (6 

 and c), submedian lips; (e), median dorsal or ventral tooth-like struc- 

 ture; (/), mouth cavity; (g), first part of esophagus; (h), body wall; 

 and (i), lateral cuticular expansions. 



FIG. 6. Outline of tail of female to show position of anus. 



FIG. 7. Ova, showing enclosed larvae. 



FIG. 8. Ventral view of tail of male, showing (o), cuticular striations 

 of the general body; (6), the quadrilateral cuticular plates within 

 bursa; (c), cuticular expansions forming the bursa; (d), cloaca; (e), 

 spicules, and the papillie of the tail. 



FIG. 9. Specially enlarged view of the ventral side of tip of tail to 

 show the small papillae of this portion. 





PLATE X. 



Spiroptera (?) iguana and Dispharagus ardeae: (camera lucida drawings; scale of enlargement indicated by line drawn from each figure). 



FIG. 1. Spiroptera (?) iguance: ventral surface of tail of male, show- 

 ing tip of tail and arrangement of papillae about the cloaca. 



FIG. 2. Spiroptera (?) iguana?: lateral view of tail of male, show- 

 ing (a and a,), the principal and accessory spicules and (6) the 

 cloaca. 



FIG. 3. Spiroptera (?) iguana;: head end, showing (a), mouth and 

 (6), esophagus (structure of lips uncertain). 



FIG. 4. Dispharagus ardea;: anterior end viewed laterally, showing 

 (o), one of the lateral lips; (6), the "cordons; " (c), the anterior narrow, 

 and (d), posterior wider portions of the esophagus. 



FIG. 5. Dispharagus ardea;: frontal view of head (lips bent to one 

 side by pressure of coverglass), showing (a), the two lateral lips and 

 (6) the beginnings of the lateral cords at bases of lips. (Scale of en- 

 largement below, same as for Figs. 4 and 6. ) 



FIG. 6. Dispharagus ardea;: tail of female, showing position of anus 

 (a), and the mammillary eminences (6) alongside of anus. 



