. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature . have a branched digestive tract, F. hepattca above de-scribed being taken as the type. This separation has not met with general recog-nition although supported by Blanchard and Cobbold (1). Welnland has proposedto substitute the term Dicrocalium, used by Dujardln, for Dislomvm, retainingFasciola for the type-species, but this proposal has not met with acceptance. TheDlstomes vary in size from forms almost microscopic to those which, like Monlez (35), measure 6 cm. long In alcohol, or even 12-5
. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature . have a branched digestive tract, F. hepattca above de-scribed being taken as the type. This separation has not met with general recog-nition although supported by Blanchard and Cobbold (1). Welnland has proposedto substitute the term Dicrocalium, used by Dujardln, for Dislomvm, retainingFasciola for the type-species, but this proposal has not met with acceptance. TheDlstomes vary in size from forms almost microscopic to those which, like Monlez (35), measure 6 cm. long In alcohol, or even 12-5 cm. In the freshcondition (D. gigas, Nardo). Bislomum halosauri, Bell (36), is parasitic upon adeep-sea fish taken In 1090 fathoms. Distomum macroslomum (flg. 4, B) of the?woodpecker (Apternus tridaclyltts) has a remnrkable laival form known as Letico-chloridium paradoxum. which Is parasitic on Sticcinea putris, and consists of anumber of branching threads, from which are developed one or two contractilesacs (flg 4 C, D). Their growth distends the tentacle until it bursts and the sac. Via. 4.—A, Bilharzia hxmatohia, the thin female in the gynajcophoric canal ofthe stouter male; X15 (after Leuckait). B, Distomum macroslomum, showingthe digestive and the greater part of the genital apparatus with the cirrus pro-truded ; X 30. C, Snail {Succinca), the tentacles deformed by Lfucochloridium ;natural size. D, Lencochloridium removed from the tentacle; natural size(after Zeller). E. Bucephalus pclymorphus; highly mognifled (after Zlegler).F, Portion of a sporocyst containing Bucephali In process of devclopraent;X about 50 (after Lacaze-Duthiors).hangs outwards. Tho threads within the Succinea contain only granular cellsiwhilst the contractile sac la occupied by an organism ovoid in form, with a thickclear border,tho rudiments of two suckers, a digestive tract, and excretory htemalobia, <^obbold(l), Is one of the most dangerous human parasites,and occurs In the bl
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