40 



lum, without projecting beyond its surface; their transverse and longi- 

 tudinal diameter is about 0.24 mm. For the greater part they consist 

 of slender, filamentous elements, each of them with an elongated, 

 narrow nucleus ; those nuclei form a continuous series with the nuclei 

 of the hypodermis-cells, but they lie a little below the plane of them. 

 It may be suggested, that these elements bear tactile hairs upon their tip , 

 as stated with the sensory organs of other Oligochaetae , but I have 

 not observed them. In the basal portion of the organ other club-shaped 

 cells are to be found , traversing with their elongated , narrow necks 

 the layer of filamentous cells; they consist of a finely granular sub- 

 stance and possess an oval nucleus. 



Similar organs are already met with in other Lumbricidae. Michaelsen 

 found in Ac. georgianus ! ) upon the Xth segment, two large papillae in 

 the series of the ventral bristles. He describes them as clear, eye-ball- 

 shaped organs, which lie between the layer of transverse muscles and 

 the cuticula and consist of slender, spindle-shaped cells. The sin- 

 neszonen, observed by Vejdowsky in the segments of the middle 

 body-region of some Lumbriculidae , seem also much to resemble 

 the organs of Glyphidrilus ; those organs however appear to be extru- 

 dible. Probably the glandular papillae , of which Rosa observed no less 

 than 22 in Bilimba papillota, belong to the same categoiy. 



The intestinal canal of this' worm is of a simple structure 

 and wants the glandular coeca, found in many other Lumbricidae. 

 The pharynx is situated in segment IV; then follows the oesophagus 

 in segments V to VII, which in the VIII th segment passes into the 

 gizzard. The tubular intestine, then following, extends back to segment 

 XV, where it passes into the sacculated intestine. A kind of typhlo- 

 solis appears to be present in segment XIX and XX; singular lon- 

 gitudinal folds also are to be seen here at the ventral side of the 

 intestine. 



The epithelium, lining the innerside of the pharynx, has not the 

 same structure on the dorsal and the ventral side. In the first region 

 it consists of tall columnar cells, provided with cilia and showing 

 darkly stained nuclei, but in the lateral region the epithelium alters 

 its character and becomes a layer, showing no distinct cells, but 

 only a small number of irregularly scattered nuclei. The outer wall of 





1) Jahrb. der Wissensch. Anstalten zu Hamburg. V, 1888, p. 70, pi. 2, fig. id. 



