I 



BY S. J. JOHNSTON. 337 



the animal, but from this point to the end of the tail they spread 

 superficially over the dorsal and ventral walls, leaving only a 

 small central space free from their encroachments and occupied 

 by parenchyma alone. 



Briefly the characteristic features of the animal by which it 

 may be readily distinguished from other species of the same 

 genus are the globose, solid ovary situated in front of the 

 elongated, somewhat cylindrical, lobulated testes, whose shape 

 might not inaptly be compared to long, knobby potatoes; the very 

 numerous, rounded, follicular vitelline glands extending over a 

 large part of the body-surface; the simple, orbicular character of 

 the suckers, and the markedly anterior position of the ventral 

 sucker; the distribution of the spinous papillae, and the longi- 

 tudinally striped appearance of the integument when the surface 

 of the animal is in the optical plane. 



As regards its relations to other members of the genus, the 

 simple nature of the intestine, the absence of hooks or lobes from 

 the oral sucker, the almost total obliteration of the oesophagus 

 and the absence of a retractile telescopic tail part, place the species 

 in Dujardin's subgenus Brachylaimus (Bronn's Klassen u. 

 Ordnungen, Bd. iv., p. 909). 



But it does not show a striking likeness to any particular 

 species, though it resembles some in its external characters, 

 others in respect of the alimentary canal, others again in the 

 form or disposition of the reproductive organs. As regards the 

 character and situation of the suckers, it shows a close resemblance 

 to D. tornatum, Rudolphi. The globose, solid ovary resembles 

 that organ in D. ocreatum, Molin,"^ D. rnonticellii, Linton, and D. 

 grandiporum, Rudolphi. The character of the suckers, the ali- 

 mentary canal, and the distribution of the spines over the body 

 are very similar to those of D. philodryadum, G. S. West. 



The figures for the plate were drawn by my wife. 



* Linton, Notes on Trematodes, Proceedings U.S. Nat. Mus., Vol. xx., 

 p. 515, etc., etc. 



