PARASITIC ROUNDWORMS 



520 



44 (45) With anterior end bent ventrad. 



Camallaniis ancylodirus W ar.l and Maguih. 



Mature female 25 mm. lonp, 0.56 mm. broad: male iq mm l.mir o ..s 

 mm broad. Oral armature in female 0..42 to o.hH mm. Iohk by o"ih to 

 0.187 mm. broad; in male 0.126 mm. lonK by 0.12 mm. bn.a.i. Trident 

 with 3 or 4 roots, in female 0.21 and in maleo.iSmm I..11L' si.i. nl.-, „.- .rl. 

 equal. Vulva three-fifths of length from anterior end 



In intestine of German carp. Fairport, Iowa. 



Fig. 822. Camallanus ancylodirus. Head of male. 

 Magath.) 



X 70. (.After W ar.l and 



45 (44) With anterior end attenuated, not bent ^6 



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

 tip Camallanus oxycephalus Ward and Magalh. 



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 lip of 

 female Camallanus trispi)wsus (Xa:'\(\\) 185 i. 



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

 16 rays on each valve. Male 6 mm. long, 0.12 to 0.16 mm. broad. .\nus o.oS mm. from laudal 

 tip. Two spicules, 0.12 and 0.43 mm. long. Fem.ale 12 mm. long, 0.24 to 0.27 mm. liroad 

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

 which bears three minute points. Vulva with prominent lips. 



In small intestine of Emys guttata, E. reticulata, E. scrpala, Chclydra .urpcutitta. Thiladcl- 

 phia (Leidy). 



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

 sharply separated. Male with preanal sucker. 



Family Cucullaxid.ae Slossich iSgS 



Mouth eUiptical, 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 descrihcd 

 adequately. In the past these forms have often been recorded as Dacnilis Dujardin 1S45 

 and assigned to the Heterakidae. 



