METORCHIS TRUNCATUS 



I6 7 



posterior extremity. Between them, and in front of their blind 



ends, lie the two elliptical testes, one generally a little in 



front of the other. In front of them, 



either in the median line or somewhat 



laterally, the spheroid ovary is situ- 



ated ; in front, again, is the uterus, the 



coils of which usually extend beyond 



the median field. The vitellaria are 



at the sides of the central third of the 



body, thus commencing in front of the 



ventral sucker ; the cirrus pouch is lack- 



ing ; the genital pore is close in front 



of the acetabulum. The excretory pore 



is situated at the posterior extremity. 



Eggs, 0^029 : O'on mm. 



This species is known to occur in 

 the seal, in the domestic cat and dog, 

 in the fox and in Gulo borealis, but it 

 easily escapes observation in conse- 

 quence of its small size. Some circum- 

 stances point to the likelihood that 



both this Species and OpisthorchlS feli- 



neus. may invade their hosts by means 



Of infected fish, but hitherto the experi- 

 , , j. ,. , , . , . , . 



mental feedings conducted in this direc- 



tion by Askanazy have not yielded 



positive results ; in any case it is a 



remarkable circumstance that, in ttye five cases from East Prussia, 



specimens of Dibothriocephalm latus were also present, and these 



undoubtedly originate from fish. 1 



7. 



FIG. gg.Metorchis truncatus, 



Ventral sucker ; /., intestinal 

 fork; V.sc., vitelline sacs; T., 



testes ; o., ovary ; R.S., recep- 

 taeulum seminis ; ut., uterus. 



1 Rivolta, " Sopra una spec, di Distoma nel gatto e nel cane " (Giorn. anat., fisiol. 

 e pat. d. anim., 1884, xvi., p. 20) ; Zwaardemaker, H., " Cirrhos. paras." (Arch. /. 

 path. An., 1890, cxx., p. 197) ; Winogradoff, K., " Ein neues Dist. a. d. menschl. Leber 

 (Nachr. v. d. K. Tomsk'schen Univ. [1891] 1892, iv., p. 116) ; "Ein zweit. Fall v. D. 

 sib." (ibid., p. 131); " Ueb. Wurmer, welche i. menschl. Korp. paras." (ibid., [1892] 

 1893, v.); Braun, M., " Ueb. ein f. d. Mensch neues Dist." (C. /. B. u. P., 1894, xv., 

 p. 602); Ward, H. B., "On Dist. fel. in the Un. St." (Veterin. Magazine^ 1895); 

 Kholodkovsky, N., " Sur quelq. rar. par. de I'homme en Russie " (Arch, paras., 1898, 

 i-, P- 354^ I Cholodkovsky, N., Icones helm. horn. II., St. Petersb., 1898, plate xi., 

 fi. 115 ; Askanazy, M., " Ueb. Inf. d. Mensch. mit Dist. felin. in Ostpreussen u. ihren 

 Zusammenhang mit Leberkrebs " (C. /. B., P. u. L, 1900 [i], xxviii., p. 491); "Dist. 

 fel. beim Mensch. i. Ostpr" (Verh. d. D. pathol. Ges., 1900, iii., p. 72) ; Kamensky, G., 

 " Not. helm., i., Charkow, 1900; Braun, M., " Z. Kenntn. d. Trem. d. Sdugeth." (Zool. 

 Jahrb. Syst., 1901, part xiv., p. 314). 



