1920.] J. Stephenson: Oligochaeta from India and E. Persia. 247 



pores, but not in the male region ; for ready reference they are shown in fig. 50. 

 From my examination of the specimens which are referred to below, I do not doubt 

 that when special setae are found near the spermathecal pores they are of this type ; 

 but I have never found setae of this form in the neighbourhood of the male field, 

 though other more slightly modified forms are not uncommon there. 



Choral, between Khandwa and Indore, Central India. 23-vi-1917. B. Prashad. One sexual 

 specimen and others smaller, doubtfully of the same species. 



Saugor, Central Provinces. 20-vi-1917. B Prashad. A single specimen. 



Bina. Central Provinces. 19-vi-lQ17. B. Prashad. Numerous specimens, mostly immature, 

 only three with sexual marks. 



Teor, 8 miles from Jubbulpore. Central Provinces. 22-vi-1917. B. Prashad. A single speci- 

 men . 



Partabgarh, S. Rajputana. Feb. 1918. Col. J. Manners-Smith. Two specimens, one immature, 

 the other scarcely fully mature. 



Poona, W. India. 3-vii-1917. B. Prashad. Several specimens, apparently mostly not fully 

 mature. 



Wahi, on the way to Mahableshwar, W. Ghats. 4-vii-1917. B. Prashad. Six specimens, 

 two with sexual marks. 



Some of the above specimens appeared at first to be worthy of separation as 

 distinct varieties, on the ground of differences between them and Michaelsen's des- 

 cription, — especially as regards the copulatory setae of the spermathecal segments and 

 of those of the neighbourhood of the male field, joined with the difference in the at- 

 tachment of the spermathecal diverticulum. But a careful comparison of the specimens 

 among themselves, and the examination of the co-types of the species, has shown me 

 that the differences are not of great importance. 



The majority of the specimens encountered are not fully mature ; the clitellum 

 is often wanting, even when all other marks of maturity are present. The length is 

 often much less than that of the original examples ; — -lengths of 45, 56, 67 and 75 mm. 

 were met with, in each case the best developed of the batch being measured. 



The first segment may be divided by a median longitudinal furrow behind the 

 prostomium. 



The dorsal pores may begin in 11/12 instead of 12/13. 



The papillae on or near the male field are variable. Those on xvi, or those on 

 xx, may be absent ; and I have not seen the paired papillae on segments xvii and xix 

 internal to the male pores ; there may however be median papillae on these segments. 



Similarly with the papillae of the spermathecal region. In addition to those des- 

 cribed by Michaelsen, there may be a pair on segment viii similar to those on ix outside 

 the line of setae b, and a median papilla, it may be of considerable transverse extent, 

 on x. 



The seminal vesicles are in ix and xii, or in xii only ; in this latter case it is pos- 

 sible that a second pair would have developed at a later stage. The prostatic duct 

 is often straight, or only slightly bent ; but the explanation may be the same. 



The spermathecal diverticulum is in all cases attached to the ental end of the 

 duct, or in one specimen to the base of the ampulla. 



The copulatory setae of the spermathecal region, when found, are of the form 



