264 SPOLIA ZEYLANICA. 



External Characters. — Length 2 1/2 inches ; breadth, maximum 

 3 mm. ; segments 120. Colour pale olive. 



Prostomium small, prolobous. First dorsal pore in furrow 9/10 ; 

 dorsal pores extremely distinct in some regions. 



Clitellum not distinct, apparently XIV. -XVI. ■= 3. 



Male pores on XVIII., on papillae, in a common slightly elevated 

 transversely extended glandular area ; the pores in Hne of setse 6, 

 separated by an interval equal to 1/5 circumference. 



Copulatory areas as single ventral oval patches on segments XI., 

 XII., and XV. ; the one on XV. encroaching sHghtly on XIV. ; 

 the outlines of the other two flattened where they touch, along the 

 furrow 11/12. The area on XI. was not precisely in the middle of 

 the ventral surface, being displaced a little to the right. 



Setse in each segment numerous. A definitely limited mid- ventral 

 tract is without setse, as also a more indefinite mid-dorsal tract. 

 The lines of setse a and b are distinct and regular on each side ; but 

 the rest of the setse are much less regularly arranged. The lines of 

 the ventralmost setse (a and b) converge inwards a little about the 

 region of the male aperture, which is in line b. The setse are small 

 and difficult to count ; the number per segment varies considerably, 

 but is roughly 24-32 in the anterior part of the body. In the 

 anterior part of the body ab = 2/7 aa, more posteriorly ^= 1/3 aa. 



Internal Anatomy. — The gizzard is in VI. ; in XV. the osso- 

 phagus appears as a rounded white mass ; in XIX. the intestine 

 begins. 



The nephridial system is micronephridial. There is a large tuft 

 of nephridial tubes on each side of the alimentary canal at the 

 anterior end of the gizzard, a smaller one behind this on septum 6/7, 

 and another on 7/8. 



The first definite septum is 6/7, which is very thin ; septum 7/8 is 

 somewhat thickened. 



The male funnels are one pair in X. and one pair in XI. ; the 

 seminal vesicles are in XI. and XII., and the lobular prostates, of 

 moderate size, in XVIII. 



The spermathecse are one pair only, lying in segment IX. and 

 opening at the level of furrow 8/9. The spermathecal sac is of an 

 elongated ovoid shape, the duct being very short. A long tubular 

 diverticulum springs from the base of the spermatheca ; it is 

 between three and four times as long as the spermathecal sac itself ; 

 this diverticulum may be somewhat coiled, and may extend for 

 some distance across the middle line. 



The genital setse have a length of 4/5 mm., and a breadth of 24 ^. 

 They are gently curved, the terminal portion being armed with 

 small triangular teeth, distributed all round the circumference and 

 not arranged in rows ; the distal end tapers somewhat, and the 

 extreme point is recurved and flattened. 



