OPISTHORCHIS FKLINEUS 163 



That the eggs which reach the open with the sputum before 

 segmentation develop in the water into a miracidium ciliated all 

 over, which hatches and swims about freely. Recently Stiles has 

 identified with the lung fluke a Distomum first found by Duncker 

 encysted in the muscular system of pigs. 



LITERATURE. 



KERBERT, C. Z. Trem.-Kenntn. (Zool. Anzgr., 1878, i., p. 271.) 



Beitr. z. Kenntn. d. Trem. (Arch. mikr. Anat., 1881, xix., p. 519.) 

 BAELZ, E. Ueb. paras. Hsemopt. (Ctrbl. f. med., Wiss., 1880, p. 721.) 

 MANSON, P. Dist. ringeri. (Med. Tim. and Gaz., 1881, ii., p. 8 ; and 1882, ii., p. 42.) 

 BAELZ, E. Ueb. einig. n. Par. d. Mensch. (Berl. klin. Wchschr., 1883, p. 234.) 

 YAMAGIVA, K. Lungendistomenkrkht. i. Japan. (Arch. f. path. An., 1892, cxxvii.) 



Z. Aet. d. Jackson' schen Epilepsie. (Ibid., 1890, cxix.) 

 MIURA, M. Fibr. Tuberkel verurs. d. Paras.-Eier. (Ibid., 1889, cxvi.) 

 WARD, H. B. Dist. west. i. d. verein. Staaten. (C. f. B. u. P. 1894, xiv., p. 362, 



and 1895, xvii., p. 304.) 



RAILLIET, A. Par d. anim. dom. du Japon. (Le natural, 1891, xii., p. 143.) 

 JANSON. Mitth. d. Ges. f. Natur- u. Vlkrkde. Ostas., 1897, Nos - 59 60. 

 KATSURUDA, F. Beitr. z. Kenntn. d. Dist. west. (Ziegler's Beitr. z. path. Anat. 

 u. z. allg. Path., 1900, xxviii., p. 506.) 



Gen. 4. Opisthorchis, R. Blanch., 1845. 



Fasciolidae of medium size, with long flattened bodies, usually attenu- 

 ated anteriorly. The cuticle usually has no spines. The suckers are small 

 and fairly close together. Intestine with pharynx, short resophagus and 

 long unramified intestinal ca?ca. The genital pore is close in front of the 

 ventral sucker ; there is no cirrus pouch. The testes in the posterior end, 

 situated obliquely one behind the other, are lobulated or ramified ; the 

 ovary in front of them lobulated or unlobulated ; and behind it there 

 is a large receptaculum seminis. Laurer's canal present ; vitellaria at the 

 sides not extending beyond the ventral sucker towards the front. The 

 uterus, with oblique coils, occupies the central field in front of the ovary. 

 The excretory bladder is Y-shaped, the long united part running in the 

 shape of an S between the testes. The parasite lives in the bile ducts 

 of mammals and birds. 



i. Opisthorchis felineus, Riv., 1885. 



Syn. ; Distoma conus, Gurlt, 1831 (nee Creplin, 1825); Dist. lanceolatum, 

 v. Sicb., 1836, v. Tright, 1889 (nee Mehlis, 1825 = Fasciola lanceolata, Rud., 

 1803); Dist. sibiricum, Winogr., 1892; Dist. tenuicolle, Muhl.,. 1896. 



This parasite is yellowish-red in the fresh condition, and almost 

 transparent. The body is flat, with a conical neck at the level 

 of the ventral sucker marked by a shallow constriction : this, 

 however, is only noticeable in fresh and somewhat contracted 

 specimens. Posteriorly to the ventral sucker the lateral borders 

 run fairly parallel ; the posterior end is either pointed o> rounded 

 off. The length and breadth vary according to the contraction, being 



