ASCARIS TYPICA. 



137 



striae seen in some other species. The posterior edge of each cuticnlar band projects 

 prominently beyond the anterior edge of the one next sncceeding, so that the edge of 

 the worm appears distinctly serrate. Tlie oesophagus (tig. 44) is divided into two 

 portions; an anterior portion about 4""" long by 0.4""" in diameter at its distal end. 

 This part, which is extremely muscular, is followed by a second i^ortiou of different 

 histological appearance and wider lumen, measuring about 1.25"'"' long by 0.25'"'" in 

 diameter, and in all cases examined it was sigmoid. Tlie distal end of this body 

 leads directly into the anterior end of the intestine; both oesojihageal and intestinal 

 caeca are absent. 



Fig. 49. 



The adult males (fig. 37) vary from 31 to 38"™ long and 1 to 1.5™" in diameter; 

 the proximal extremity is more attenuate than the distal end (figs. 45-47), which is 

 curled, flattened dorso-ventrally, and provided with lateral alae; the postanal portion 

 is conical and bent vertically. Nine to ten, or iiossibly eleven, pairs of postanal papillae 

 are present; of these, three occasionally two or two and a half pairs of conical papillae 

 are nearer the tip, while six to seven, possibly eight, ])airs of shorter papillae are 

 nearer the cloaca. The arrangement of the praeanal i^apillae varies greatly in different 

 specimens; there may be over seventy-five on each side, arranged in three irregular 

 rows. The cloaca is 0.27'""^ from the tip of the tail, and extruding from it may 

 frequently be seen the spicules. The latter are of very unequal size, the left spicule 

 (3'""") about three times as long as the right (0.96'""' long). 



