rgoS.] W. MiCHAEi^SEN : Oligochceta of the Indian Empire and Ceylon. 173 



Male area (fig. 15) occupying the whole length of the i8th segment, quadrangular 

 with rounded angles, somewhat broader than long, deeply depressed especially in 

 the median part, at the sides bordered by glandular elevations which occupy the 

 remainder of the ventral surface of segment 18. The depressed male a;rea bears on the 

 lateral parts, inclined towards the median ventral line, a pair of nearly circular wrinkled 

 cushions. The hinder part of these cushions bears a penis, directed obliquely and 

 medially backwards, and formed like a cone rounded at the top and with a deep 

 longitudinal furrow at the anterior side ; the tips of the penial protuberances nearly 

 meet above the median ventral line. The furrows at the anterior side of the penial 

 protuberances may be called seminal furrows ; they are continued forward as far as 

 the centre of the glandular cushions, ending here in the male pores. 



Female pore single, at the median ventral line on the anterior part of the 

 14th segment, surrounded by a circular area dark in the middle and white at the 

 borders. 



Spermathecal pores two pairs on the intersegmental furrows 7-8 and 8-9, 

 those of one pair distant one from the other about yq of the circumference of the 

 body. 



Internal Anatomy. Septa all tender, those of the testicular region and some 



adjacent ones only very little thicker than the others, but not at all strong. 



Alimentary tract: A very small gizzard in the 5th segment. The gizzard 

 hardly thicker than the adjacent parts of the oesophagus, but not exactly rudimentary. 

 It has moderately thick muscular walls, the muscle-layer being about three, times as 

 thick as the interior epithelium. The oesophagus is simple, without calciferous 

 glands or walls of a calciferous gland-like structure. 



Circulatory system: Last hearts in the 13th segment. 



Nephridial system meganephric. There is no perceptible difference between 

 the nephridia of different segments. ■ ' 



Anterior male organs: Two pairs of tuft-like testes and two pairs of much 

 folded sperm-duct-funnels free in the loth and nth segments. Four pairs of great, 

 much incised sperm-sacs depending forward from septa 9-10 and lo-ii and backward 

 from septa lo-ii and 11-12 into segments 9, 10, 11 and 12 — 14 respectively, the 

 hindermost being very great, extending through three segments. 



Prostates with a compact, thickly disc-shaped, much incised glandular part and 

 a rather thick, irregularly bent muscular duct, which is about as long as the glandular 

 part. There are no penial setae. The circle of setae of the i8th segment is broadly 

 interrupted ventrally ; the most medial setse stand on the lateral part of the thick 

 glandular protuberances laterally from the male area. There may occasionally be 

 foimd a seta even more medial, but this does not project ; it is entirely embedded in 

 the thick glandular masses, as if overgrown by them. It may, seen in sections, be 

 taken for a penial seta, which it is by no means ; it has quite the normal shape and 

 structure. There are no setae between the male pores. 



Spermathecae (fig. 14) : Main pouch with a big sac-shaped ampulla. The 

 external appearance of the ampulla is very pecuHar ; the outer surface is areolated, 



