1920.) J. Stephenson : Öligochaeta from India and E. Persia. 249 



Eudichogaster trichochaetus, sp. no v. 

 Plate XI, figs. 52, 53. 



Bombay, Victoria Gardens. 30-vi-li)17. B. Prashad. Numerous specimens, some immature. 

 Bombay, near Colaba Railway Station, l-vii-1917. B. Prashad. Seven specimens. 

 Bombay, under a tree near the Fort. 30-vi-1917. B. Prashad. Three specimens. 

 Palchar, N. of Bombay, between Bombay and Surat. 7-vii-1917. B. Prashad. A number 

 of specimens. Two showing sexual marks. 



External Characters : — -Length 32-45 mm.; diameter i75-2'25 mm. Colour a 

 yellowish grey, no difference between dorsal and ventral surfaces. Segments 103-128. 



Prostomium epilobous 2/5, pointed behind, the point continued back as a groove 

 which divides the dorsal surface of the first segment ; or in some cases the prosto- 

 mium itself appears to be prolonged backwards so that the point is at the furrow 1/2. 



Dorsal pores begin from furrow 12/13 or 13/14. 



The ratios of the setal intervals may be expressed thus: — ab = \ to \aa=\bc 

 =\cd from behind the male genital region backwards ; in front of the clitellum the 

 ratios are less regular, but ah is certainly wider, equal about to half aa ; dd is nearly 

 half the circumference. 



I have never found a recognizable clitellum. 



The male field is a rectangular thickening, whitish in colour, taking up segments 

 xvii-xix, and extending laterally on each side to between the lines of b and c ; it 

 may extend slightly on to segments xvi and xx. The prostatic apertures are small 

 transverse slits corresponding in extent to the interval ab, on segments xvii and xix. 

 The seminal grooves pass longitudinally between the outer ends of the prostatic pores 

 of the same side, and are thus in the line b, and some little distance internal to the 

 lateral border of the thickened area. 



The female pores may be indicated by a pair of tiny white thickenings just in 

 front of, and internal to setae a on segment xiv. 



The spermathecal pores were not seen externally. There is some thickening ven- 

 trally on segments viii and ix, indefinite, and perhaps more specially marked round 

 the site of the ventral setal couple. 



Internal Anatomy : — Septum 4/5 is somewhat strengthened, 5/6-7/8 are thin, 8/9 

 is somewhat strengthened, 9/10 slightly so, the rest thin. 



The two gizzards are relatively large, in segments v and vi. The calciferous glands, 

 three pairs, in segments x, xi, and xii, are not set off from the oesophagus. The in- 

 testine begins in xiv (?). 



The last heart is apparently in xii. 



The micronephridia are arranged in four longitudinal rows on each side of the 

 body ; they are small twisted tubes, those of the innermost series on each side the 

 smallest, and situated near the next outer row. 



Testes and funnels are apparently free in segments x and xi (judged from the 

 masses of free flocculent material in these segments). Seminal vesicles are present in 

 segment xii only, as considerable masses with lobate margins. 



