Trematodes of the Northumberland coast. No. II / by Marie V. Lebour.

  • Lebour, Marie Victoria, 1876-1971.
Date:
[1907?]
Catalogue details

Licence: In copyright

Credit: Trematodes of the Northumberland coast. No. II / 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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    suckers are much the same, but the intestine of the present worm is larger and extends further down the body. It differs from the ‘Pearl Trematode ’ described by Jameson and Nicoll* in its smaller size, conspicuous head glands, larger intestine, greater size of the oral sucker in relation to the ventral, and in the shape of the excretory vesicle. The cercaria found by Levinsenf in Saxicava rtigosa, as well as Jameson’s ‘Pearl Trematode’, is referred by OdhnerJ to Gymiiophalbts bursicola, Odh., which also occurs in the Eider Duck, and agrees with these cercarias far more closely than does G. somateria, to which species Jameson originally referred his worm. Nicoll§ however considers that his new species G. dapsilis from Oidemia fusca and O. nigra (Velvet Scoter and Common Scoter) has equally strong claims to be re- garded as the adult of the ‘ Pearl Trematode.’ Cercaria glandosa occurs in about ten per cent, of the Pahidestrina stagnalis from Fenham Flats near Holy Island : it is usually found singly, but as many as six specimens have been counted in one animal. Cercaria MACOMi®, nov. (Plate I. fig. 2.) This cercaria occurred in several specimens of Macoma balthica from Fenham Flats, between the mantle and shell. Two or three specimens were sometimes found in one mollusk. It is oval and measures 070 mm. in length when at rest. The body is covered with spines and is very transparent. The oral sucker measures 0-22-0-26 mm. in diameter and the ventral o’oS-o.o'j mm. The latter is situated well behind the centre of the body and its inner margin is crenulated. The oral sucker leads to a small pharynx, and this to-a short oesophagus branching into two broad intestinal lobes without much food inside, and in * NicoU, IK, “ Notes on Trematode Parasites of the Cockle (Cardium edule) and Mussel (Mytilus euulis),” Ann. and Mag-. Nat. Hist., Ser. 7, Vol. XVII., 190G, p. 148, t Levinsen, G. M. R., “Bidrag til Kundskab om Grononlands Trematodfauna,” Overs. K. D. v. Selsk. Eorh., 1881, p. 52. t Odhner, T., “ Die Trematoden des Arktischen Gebietes,” Fauna Arctica, 1905, p. 313. § Nicoll, IK., Observations on the Trematode Parasites of British Birds,” Ann. and Mag. Nat. Hist., Ser. 7, Vol. XX., 1907, p. 265.