517 



36. M. M. KOWALEWSKL Studya helmintologiczne, cze.sc VII. CHelnthi- 

 thological studies. Part VII, with S plates). (Etudes helmintoloyi- 

 ques, Vll-me partie). Mémoire présenté par M. Lad. Kolczynski m. c. 

 (Planche^XI -^XIII). 



The author deseribes in tins paper a new species of Metorchis 

 Looss, two new ones of Triehosoma Rud. and a curious species of 

 Diplopostbe Jacobi; he also gives a new description of Triehosoma 

 resectum Duj. and mentions an interesting case in the anatomy of 

 Bilharziella polonica M. Kow. 



1. Metorchis teuer sp. n. (fig 1.). Found in the liver of 

 Mergus merganser R. Very similar to M. xanthosomus (Crépi.) Braun 

 (1902). differing by a more délicate and slender body, by the po- 

 sition of the posterior sucker almost in the middle of its length, 

 and much (twice to three timesj smaller testes and ovary. 



2. In one (amongst 58) maie spécimen of Bilharziella po- 

 lunica M. Kow. (1895) from an Anas querquedula L. the author 

 encotmtered the two intestinal branches quite separated up to the 

 posterior end of the body. as shewn by fig. 2. 



3. Triehosoma resectum Duj. (1843) (fig. 3, 4, 5. 6). — 

 Althougb the desriptions of this worm. given by Dujardin ."> . 

 E b e r t h (4) and v. L i n s t o w (8), are sufficient to recognize the 

 species. they contain however some incorrections. It may be men- 

 tioned bere that the lateral bands in the female are 20 — 24 // 

 broad. i. e. about ! 4 of the breadth of the body. the ventral band — 

 10 — 12 /< broad. i. e. l / s of the same breadth; in maie, the former 

 bands are 12 — 14 fi broad i. e. l / s of the breadth of the body 

 and ventral band — 6 — 1 fi broad. i. e. Vio — V12 of the same 

 breadth. Eggs- 60 fi long by 28 fi broad, with little longitudinal ribs 

 upon tbe ends. Spiculum 126 mm. long. The form of the bursa ean 

 be understood onlv by means of the adjoined drawings (fig. 3.4). 



4. Triehosoma parile sp. n. (fig. 7, 8, 9). Found in the intes- 

 tine of Bubo maximus Siebb. Female: length 20 mm.; length of neck 

 7 - 8 mm. Lateral and ventral bands equal. 20 fi broad, i. e. 1 / i of 

 the breadth of the body. Genital opening about 0"1 mm. distant 

 from the posterior end of the Oesophagus. Eggs 64 fi long and 32 fi 

 broad, with a superficial net of very délicate, chiefly longitudi- 

 nal ribs. Male: Body 161 mm. long; neck 7-5 mm. long. Lateral 

 and ventral bands are equal, 10 fi broad, i. e. 1 / 6 of the breadth 



