1920.] J. Stephenson: Oligochaeta from India and E. Persia. 219 



very irregular in shape, and narrows below to become the duct without any distinct 

 delimitation. If the beginning of the duct is taken to be just below the diverticula, 

 it is about as long as the ampulla ; it narrows gradually towards its ectal end. The 

 diverticula, about three in number, are small rounded sessile chambers, situated at 

 what may be considered as the lower part of the ampulla. 

 There are no penial setae. 



Perionyx minimus, sp. nov, 

 Plate X, fig. 23. 

 Belgaum, Bombay Pres. 4-vi-1917. T. R. Bell. Numerous specimens. 



External Characters : — The worms are very small ; a long one measures 45 mm. 

 in length, while the thickness is only 1 mm., or as a maximum ij mm. The colour 

 is a medium brown dorsally, and a rather lighter brown ventrally. Segments 100. 

 The ventral surface is flattened. 



Prostomium epilobous \ or nearly so, tongue cut off behind ; both prostomium 

 and first segment divided in the mid-dorsal line by a longitudinal groove. 



Dorsal pores from 4/5 ; or a rudimentary pore in 4/5, and the first well developed 

 pore in 5/6. 



The setal rings are almost closed ventrally ; the dorsal interval is well marked, 

 =2yz. The setae are much closer set ventrally than dorsally. On the twentieth 

 segment there are about 26 setae, in the middle of the body about 36. 



The clitellum extends from the middle, or perhaps the anterior end, of xiii 

 backwards to include segment xvii (=4% or 5) ; it is rather narrowed, of a somewhat 

 darker colour, and the separate segments are easily distinguishable. 



The male pores are on conspicuous round papillae on xviii. The area between 

 these papillae is depressed, the depression extending longitudinally from the middle 

 of xvii to the anterior third of xix ; this area is encroached on laterally by the 

 papillae, so that the depression has a dumbbell shape, the dumbbell being placed 

 longitudinally ; the apertures look somewhat inwards. 



The female pore (or pores) are situated in a transverse groove anteriorly on 

 segment xiv. 



The spermathecal pores were not distinctly seen, but appeared to be about a 

 quarter of the circumference apart, in grooves 7/8 and 8/9. 



Internal Anatomy : — No septa are thickened. 



There is apparently a rudimentary gizzard in segment v. The oesophagus is 

 slightly bulged in segments xiii and xiv, with longitudinal vascular striations. The 

 intestine begins behind the prostates, in segment xix. The "pharyngeal glands' 

 extend back to segment vii as definite lobes on each side filling out the segments. 



The last heart is in segment xii. 



Relatively large seminal funnels are present in segments x and xi, embedded in 

 a mass of very adherent flocculent matter simulating seminal vesicles ; the testes 

 were not separately identified. 



Seminal vesicles are present in segments ix and xii; both pairs are brown in 



