140 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



PORROCAECUM PRAELONGUM (Dujardin, 1845) Baylis, 1920b 



Synonym, — Ascaris praelonga Dujardin, 1845. 



Host. — Colymhus auritus. 



Location. — Intestine. 



Morphology. — Porrocaecum (p. 135) : Body white, filiform, very 

 elongate. Head proportionately large, 400/t wide. Esophagus 4.3 

 mm. long by 400/* wide, followed by a ventriculus 400/* long and 

 accompanied by a thick cecum 3 mm. long by 600/* wide, joining 

 with the intestine. Cuticle with very conspicuous transverse stria- 

 tions. 



Fig. 204. — Purrocaecum bnsicaddatum. c, Dorsal lip; b, male tail; c, egg. 

 After, Linstow., 1884 



Male 90 mm. long by 900/* wide. Tail suddenly narrowed and end- 

 ing in a short conical point ; cloacal aperture, with a large tubercule, 

 330/* from posterior end. Membranous caudal alae present, anterior 

 to cloacal aperture, supported by 5 pairs of papillae. Spicules equal, 

 900/* long by 58/* wide. 



Female 154 mm. long by 1.3 mm. wide. Tail straight, conical, 

 pointed ; anus 600/* from posterior end. Vulva just posterior to 

 anterior fourth of body, 44 mm. from the head. Ovejector (?) 

 sinuous, 45 mm. in length, divides into 2 uteri. Eggs globular, 

 measuring 110 to 112/*, with reticulated shell. 



L ife Ji istory. — Unknown. 



