26 



PROCEEDINGS OF TEE NATIONAL MUSEUM. 



VOL. 50. 



Localities. — Germany, France, Switzerland, Austria, Italy, United 

 States. 



The amount of variation in the i-eported spicule len^hs suggests 

 the possibility of error in measurement or confusion of species. 



Fig. 27.— Teichuris mueis. Anterior extremity of bodt, 



SHOWING CUTICULAK VESICLES. ENLARGED. AFTEE GOEZE, 

 1782. 



TRICHURIS MURIS (Schrank, 1788) Hall, 1916. 



Synonyms. — Tnchocephalus muris Schrank, 1788; M astir/ odes 

 muris (Schrank, 1788) Zeder, 1803; Trichocephcdus nodosus Eudol- 

 phi, 1809. 



Specific diagnosis. — Trichurls (p. 20) : Diameter of the bacillary 

 band equals three- fourths of the diameter of the body. Bacillary 

 band ends in front of the vulva. Band is bordered with large mar- 

 ginal rods which are larger than the others and are capable of swell- 

 ing by endosmosis. Simple weak lateral lines. Granular dorsal 



line disappearing near 

 vulva. Maximum head 

 diameter 18 [x. Trans- 

 verse striations of body 

 at 4 to 5 [JL intervals. 

 There are three nodules 

 on the head, according to 

 Goeze (1782) and Ru- 

 dolphi (1809). There are also seven or eight delicate cuticular 

 vesicles (fig. 27) along the (?ventral) side of the worms, according 

 to Goeze (1782) and Eberth (18G3). The esophageal tube extends a 

 third of the length of the anterior esophageal 

 portion of the body before being surrounded 

 by the esophageal cell chain. 



Male 14 to 20 mm. long with a maximum 

 thickness of 300 [jl. Anterior esophageal por- 

 tion of body 12.5 mm. long; posterior portion 

 of body 7.5 mm. long. Ratio of lengths of two 

 portions 5:3. Spicule 700 [x long and 15 [;. 

 wide, bent in a semicircle (fig. 28). The sheath 

 is 170 [jL long and presents various shapes, 

 vesicular, tubular, funnel-shaped or terminat- 

 ing in a large turbanlike swelling 100 \^ in 

 diameter. Except at its aperture, this sheath 

 is covered with pointed conical projections. A l)lunt papilliform pro- 

 jection on each side of the cloacal aperture. 



Female 23 to 31 mm., with a maximum thickness of 400 /x. Ante- 

 rior esophageal portion of body 14 to 20 mm. long; posterior portion 

 of body 8 to 11 mm. long. Ratio of lengths of two portions 7:4. 

 Tail obtuse, terminating in a rounded point. The vulva round, lo- 



FiG. 28.— Trichuris muris. 

 Posterior extremity of 



MALE, showing SPICULE AND 



SHEATH. Enlarged. Af- 

 ter VON LiNSTOW, 1909. 



