Alien Oliqochd'ts in England. By Rev. H. Friend. 269 



guished by the free manner in which it stains. There are no ducts 

 from the gland to the pharynx, nor is the gland divided up, as is 

 the case with the septal glands found in many other worms in 

 this region of the body. In Kerria rubra Friend (6) the septa in 

 this region are thickened to carry the glands, but in Dichogaster 

 lageniforriiis there is no such thickening, and the septa give no 

 indication of any close relationship with the glandular mass. At 

 the same time one naturally assumes that the pharyngeal gland 

 of Dichogaster is homologous with the septal glands of Kerria and 

 other worms belonging to this family. 



The oesophageal or calciferous glands are found in segments 

 15-17, which is the normal position for this genus, and constitutes 

 perhaps the chief argument for regarding the new worm as a true 

 Dicliogaster. I use the alternative terms, because, while the 

 glands are in part of the true cesophageal type, composed of 

 alternate rods and open spaces, in part they are also solid and 



iJsg 



pros. 



Fig. 19. 



have all the appearance of calciferous glands. A reference "to 

 Benham's diagrams (^) shows that Dichogaster was the only genus 

 then known which had three pairs of glands in this position. The 

 liindmost gland is the largest, while the two anterior glands open 

 by a common duct (fig. 16) into the cesophagus. I give a drawing 

 of a section showing this interesting peculiarity. The structure of 

 the main portion of the gland exactly corresponds v/ith that of 

 Henlea fragilis (5). 



If^ now, we turn to the digestive and alimentary region, we find 

 some further features of interest. The tongue or taste-organ 

 (fig. 19) is well developed. The pharynx is very simple in struc- 

 ture, and together with the pharyngeal gland extends back to the 

 end of segment 6. In the 7th segment the gizzard commences. 

 This organ has a constriction about midway, but owing to its torn 

 condition, through being filled with grit when sectionized, its 

 exact shape cannot be determined. It extends to the septum 

 10/11, but this is pushed back to the beginning of the girdle in 



June 2Ut. 1916 U 



