70 THE ANATOMY OF AN AUSTRALIAN LAND PLANARIAN. 
position. In the case of Geoplana flava, however, from Brazil, Moseley (1) records 
the very remarkable fact that ‘‘the free surface of the gastric lining of the digestive 
canals was ciliated.”’ This statement is to me quite inexplicable, and I cannot help 
thinking that there must have been some error of observation. 
The lining epithelium of the alimentary canal rests upon no special layer of 
tissue, but frequently muscle fibres occur immediately beneath the epithelial cells, as 
shown in figure 16, and exactly as described by von Kennel. 
E..—The General Connective Tissue of the Body.—Under this head I propose to 
speak of the tissue which fills all the interspaces between the muscles and the various 
internal organs. This tissue has been described by Hallez (5) under the name 
Reticulum conjonctif, by von Kennel (8) under the name Korperparenchym, by von 
Graff (9) under the name Parenchymgewebe, and by Jijima (7) under the name 
Mesenchymbindegewebe. 
Before passing on to notice the condition exhibited by Geoplana spenceri, we must 
consider as briefly as may be the views which have been set forth by previous writers 
concerning this somewhat enigmatical tissue, and firstly it must be pointed out that 
the terms given above as used by various authors are not exactly co-extensive, some 
including more structures than others. 
Hallez (5) says, ‘“‘Je désigne sous le nom de tissu conjonctif, le tissu qui 
constitue la majeure partie du corps des Planaires, et que les anciens naturalistes 
appelaient pulpe ou parenchyme . . . . . J comble, comme on peut le voir, 
tous les intervalles existant entre les divers organes.”’ 
His subsequent description of this tissue makes it tolerably certain that he has 
confounded a large portion of the less definitely arranged muscular fibres with the 
connective tissue under the same appellation, which accounts for his statement 
‘“‘ e’est chez les Planaires terrestres que ce tissu présente son plus grand 
développement.” 
Von Kennel’s observations (8) on this head are very brief:—‘‘ Ueber die 
histologische Structur des ‘ Korperparenchyms’ habe ich keine detaillirten 
Untersuchungen angestellt; auf Schnitten sieht man eine feinkdrnige Grund- 
substanz, in der zahlreiche Kerne, feine Fasern, und die ‘ Bildungszellen’ oder 
Stabchen, letztere in einer Zone am Ricken und besonders an beiden Seiten nahe 
unter der oberflichlichen Muskulatur legen. Die Structur des genannten Gewebes 
stimmt vollig mit der bei unsern Stisswasserplanarien zu findenden iiberein.” 
