PARASITIC ROUNDWORMS 



529 



44 (45) With anterior end bent ventrad. 



Camallanus ancylodirus Ward and Magath. 



Mature female 25 mm. long, 0.56 mm. broad; male 15 mm. long, 0.38 

 mm. broad. Oral armature in female 0.142 to 0.168 mm. long by 0.18 to 

 0.187 mm. broad; in male 0.126 mm. long by 0.12 mm. broad. Trident 

 with 3 or 4 roots, in female 0.21 and in male 0.18 mm. long. Spicules nearly 

 equal. Vulva three-fifths of length from anterior end. 



In intestine of German carp. Fairport, Iowa. 



FIG. 822. Camallanus ancylodirus. Head of male. X 70. (After Ward and 

 Magath.) 



45 (44) With anterior end attenuated, not bent 46 



46 (47) Vulva one-third total length from anterior tip. No spines on caudal 



tip Camallanus oxycephalus Ward and Magath. 



Female slenderer than preceding species, 25 mm. long, 0.27 mm. broad, straight through 

 entire length. Oral armature smaller. First esophagus 0.47 by 0.085 mm.; second 0.57 mm. 

 wide. Male unknown. In intestine of white bass and black crappie. 



FIG. 823. Camallanus oxycephalus. Anterior part of female. X 70. (After Ward and Magath.) 



47 (46) Vulva behind center of body. Three small spines on caudal tip of 

 female Camallanus trispinosus (Leidy) 1851. 



Mouth large, valves with 8 radiating lines on each side of unstriated median band, making 

 16 rays on each valve. Male 6 mm. long, 0.12 to 0.16 mm. broad. Anus 0.08 mm. from caudal 

 tip. Two spicules, 0.12 and 0.43 mm. long. Female 12 mm. long, 0.24 to 0.27 mm. broad. 

 First esophagus 0.38 by 0.12 mm; second 0.46 mm. long. Anus 0.022 mm. from caudal tip 

 which bears three minute points. Vulva with prominent lips. 



In small intestine of Emys guttata, E. reticulata, E. serpata, Chelydra serpenlina. Philadel- 

 phia (Leidy). 



48 (43) Lips not conspicuous; esophageal regions similar in structure, not 

 sharply separated. Male with preanal sucker. 



Family CUCULLANIDAE Stossich 1898 . . 49 



Mouth elliptical, with long axis dorso-ventral, bounded by two lateral valves recalling those 

 of Camallanus. Esophagus pestle-shaped but without bulb, two regions appear alike in 

 structure, short, separated only by transverse partition. Male without caudal alae; two 

 equal spicules; preanal sucker without horny ring. Female with vulva not far from center 

 of body. 



In intestine of fishes. 



There are in North America numerous species of this genus. Only a few have been described 

 adequately. In the past these forms have often been recorded as Dacnitis Dujardin 1845 

 and assigned to the Heterakidae. 



