22 



PROCEEDINQS OF THE NATIONAL MUSEUM. 



VOL. 50. 



portion. Mouth simple. Diameter of bacillaiy Ifand in anterior 

 esophageal region about one-third that of esophageal portion. The 

 esophageal cell chain consists of elongate cells with prominent 

 nuclei. A few of the more anterior cells are of simple outline, but 

 the others have numerous constrictions along their length, giving the 

 appearance of numerous small discoidal cells with occasional nuclei. 

 These nuclei are actually near the middle of the cells. The piriform 

 glands at the posterior end of the esophagus are small. 



Male 17.5 to 20 mm. long, with a maximum thickness of .510 fi. 

 Anterior esophageal portion of body 10.8 to 10.9 mm. long ; posterior 



portion of body 

 6.6 to 9.2 mm. 

 long. The an- 

 terior portion of 

 the esophageal 

 tube from the 

 /ir?,juu\. bJ / ij % V\ \'\ \ \ mouth to the be- 



ginning of the 

 esophageal cell 

 chain is 400 to 670 

 [JL long. The body 

 ends posteriorly 

 in a bifurcation 

 formed by two 

 rounded lobes 

 (fig. 20), with the 

 cloacal aper t u r e 

 on the posterior 

 ventral surface 

 between them. 

 Spicule 1.7 mm. 

 long with a diameter of 26 ]}. at the distal end, gradually thick- 

 ening to a diameter of 52 fx at the proximal end. The campanulate 

 sheath evaginates to a distance of at least 300 /x and is studded with 

 small conical projections. 



Female 24 mm. long, with a maximum diameter of 380 fi. (Probably 

 becomes larger, judging from male diameter.) Anterior esophageal 

 portion of body 12.4 mm. long; posterior portion of body 11.6 mm. 

 long. The anterior portion of the esophageal tube from the mouth to 

 the beginning of the esophageal cell chain is 500 ]i. The anus is 

 subterminal on the ventral surface. The vulva is situated just back 

 of the posterior end of the esophagus. Eggs not observed. Two 

 specimens, apparently innnature females of this species, were col- 

 lected from the same host. On first sight they appear to be species 

 of Cajnllarla, but the ratios of the anterior and posterior body parts 



Fig. 20.— TRICHURI3 FOSSOR. J'OsTI RIOR i \TRr.MITY OF MALE. EN- 

 LARGED. m<.,lNTESTINL; Sp., oPIv^IjLL; l/OS., VESICULA SEMINALIS. 



