150 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



leaf-like valves. Eggs oval, 55/*, long by 45/x wide, with thick shells 

 of mosaic appearance. 



Life history. — Unknown. 



Distribution. — South America (British Guiana (Georgetown)). 



CONTRA CAECUM ENGONIUM Baylis and Daubney, 1922 



Host. — Ciconia. nigra. 



Location. — Not given. 



Morphology. — C ontracaecum (p. 146) : Head constricted from 

 body. Dorsal lip (fig. 219a) rounded anteriorly and with a pair 

 of double papillae situated near the anterior edge. Pulp follows 

 shape of lip but indented anteriorly; a pair of flattened processes 

 project anteriorly and laterally like 2 horns. 



Male 13 mm. long by 570/a wide. Muscular esophagus 2.75 mm. 

 long, ventriculus 140/x long; posteriorly directed appendix 700/t long 



0-//77/77 



^ o/mm 



Fig. 219. — Coxtracaecum engoxium. a, Head; b, male tail. After Basiis 

 and Daubney., 1922 



by 150/m wide. Intestinal cecum broad, reaching to within 690//. of 

 head end. Cloacal aperture 125/a from caudal extremity. Ten 

 pairs of postanal papillae (fig. 219&), 4 of them being latero-ventral 

 and the other 6 lateral and pedunculated. No preanal papillae de- 

 scribed. Spicules equal, 1.8 mm. long by 22/x, wide. 



Female unknown. 



Life h is'tory. — Unknown . 



Distribution. — Asia ( Indi a ) . 



CONTRACAECUM HALIAETI Baylis and Daubney, 1923 



Synonym. — Ascaris aquillae Smith, Fox, and White, 1908. not 

 Ascaris aquilae Gmelin, 1790. 



Hosts. — Haliaetus Uitcocephnlus and H. leucogaster. 



Location. — Intestine. 



Morphology. — C ontracaecum (p. 146) : Cuticle transversely 

 striated. No lateral alae. Three thick lips (figs. 220 and 221), 



