Fish trematodes of the Northumberland coast / by Marie V. Lebour.
- Lebour, Marie Victoria, 1876-1971.
- Date:
- 1908
Licence: In copyright
Credit: Fish trematodes of the Northumberland coast / by Marie V. Lebour. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![that the species is probably the hitherto little known Distornum bacillare (Molin). I have not given it a new generic name as the details were not sufficiently made out. It seems to me that it should be placed somewhere between the Allocreadiituc and the Lepocreadiina as it agrees in many ways with both these sub- families as given by Odhner, who suggests that D. bacillare may belong to the latter sub-family. The worms measured 1-86 mm. and 3-2 mm. respectively, the smaller specimen containing no eggs. The following measurements are from the larger specimen, which agree with Stossieh’s * in size. Width between one-fourtli and one-fifth of the length when contracted, much narrower when stretched out. Body covered with spines (D. bacillare is described as unarmed by previous authors). Oral sucker (002 mm. across) with very thick walls like a pharynx, closely resembling the Trematode which I have called Pharymjora retract ilia (see below). Prepharynx usually hardly seen, but can be a good deal longer than the pharynx, which is conspicuous. (Esophagus a little longer than the pharynx when not much extended, branching just in front of the ventral sucker into two long intestinal lobes reaching nearly to the posterior end of the body. Ventral sucker, 0-015 mm. across, at the first quarter of the body. Excretory vesicle, a simple narrow sac reaching to the hind testis. Testes globular, placed one behind the other, with a small space between. Hind testis about 0-06 mm. from the posterior end. Vesicula seininalis completely within the cirrus sac, divided into two portions, the posterior oval and the anterior at first somewhat triangular, and then narrowing into a winding portion which leads to a straight ductus ejaculatorius. The cirrus sac containing this is 0-04 mm. long, and rather broadly club- shaped. The genital opening is on the left, on the level of the anterior end of the ventral sucker. Ovary, heart-shaped, placed in front of the foremost testis, with a small space between. Recepta- culum seminis and Laurer’s canal present, but their exact relations were not made out. Uterus with few loops; it appeared inflated behind, and by the side of the cirrus sac. Eggs not numerous, measuring 0-08 mm. by 0-04 mm.; pale yellow. Vitellaria well developed, not reaching forward beyond the level of the vesicula seminalis. They cover the intestinal lobes ventrally, and fill up the space behind the testes. Life history unknown. * Stossich, M., “ Biani di Elmintologia Tergestir.a. Bo]]. Foe. di Sci. Nat. Triesle, IX., 1887, page 3.](https://iiif.wellcomecollection.org/image/b2245956x_0024.jp2/full/800%2C/0/default.jpg)
