BY J. J. FLETCHER, M.A., B.SC. 541 



mature specimens the pores have thick and tumid lips, the swellings 

 often extending on to the two segments adjacent to xv. Female 

 pores on xiv, in a line with the setae and dorsad of those of the 

 second rows. Apertures of spermathecae between segments ix 

 and x, and x and xi, in a line with the interval between the 

 two outermost rows of setae on each side. Dorsal pores inter- 

 segmental, present throughout after the 8th segment. 



Ventral surface of segments ix-xi swollen, probably functioning 

 as adhesive organs. 



Setae in eight longitudinal rows forming four pairs ; the inner 

 pairs ventral, the outer lateral and placed just where the change of 

 colour takes place. Setae simple, ^-shaped with a very slight 

 enlargement near the middle ; wanting on the first and last 

 segments, present on the clitellum. 



The alimentary canal presents no remarkable deviations 

 from the Lumbricus type. The buccal cavity leads into a muscular 

 pharynx extending as far back as segment v ; this is followed by 

 the long oesophagus which opens into the, crop lying in segments 

 xv and xvi ; the large muscular gizzard occupies the next two 

 segments, after which comes the large sacculated intestine which 

 continues throughout the rest of the body. From segments vi to ix 

 the oesophageal walls are thin, the contents showing through them, 

 but in segment x and the two immediately following it, the walls 

 become thicker, more glandular, and very vascular. In segment x 

 the oesophagus gives offa pair of lateral diverticula, hollow vascular 

 pouches with projecting rugae, which, on slitting up the canal are 

 seen to communicate with it by a pair of apertures. The diver ticu- 

 lata in segment x are always conspicuous; but in segments xi and 

 xii there are apparently no distinct pouches, though the oesophagus 

 being constricted at the mesenteries the intermediate portions of it in 

 these segments externally appear swollen, while internally the 

 portion in xi presents a number of very vascular, thick lamellae, 

 that in xn being much less modified. These are the calciferous 

 glands ; from this portion of the intestine, crystalline particles may 

 be obtained, many of which effervesce on the addition of acid, those 



