156 



Memoirs of the Indian Museum. 



[Vol.. I, 



Fig. 10. 



Plutellus sikkim- 

 ensis. 



Copulatory organs: A pair of transversely oval glandular areas at the interseg- 

 mental furrow 12-13 and divided by it, in the lines of the ventral 

 pairs of setae, sometimes connected by a glandular median area. 



Internal Anatomy. — Septa 4-5 and 5-6 tender, 6-7 — 12-13 

 thickened, especially 9-10 and lo-ii, which are very strong, the 

 others becoming gradually less strong. 



Alimentary tract: A small but distinct gizzard in the 5th 

 segment, distinctly thicker than the neighbouring parts of the 

 oesophagus and with thick muscular wall. Oesophagus behind 

 the gizzard moniliform, with folded but not exactly calciferous 

 gland-like walls. There are no calciferous glands. Intestine begins 

 in segment 14. 



Circulatory system: I^ast hearts in segment 12. 



Nephridial system meganephric. 



Anterior male organs: Two pairs of large tuft-like testes 

 and two pairs of sperm-duct-funnels free in segments 10 and 11. 

 There seem to be sperm-sacs in the 9th, nth, and 12th segments, but I am not 

 able to state this with certainty ; perhaps I mistook compact masses of sperms for 

 sperm-sacs. 



Prostates tubular. Glandular part moderately long, with deHcate axial tube, 

 formed by a low epithelium and a thick glandular coat of large, roughly granular 

 cells. The glandular part is narrowly and rather broadly undulated, and the 

 undulations are closely pressed together. Examined in toto the glandular part appears 

 nearly tongue-shaped. Only in sections is its tubular nature seen distinctly. Duct 

 thin, about half as long as the entire glandular part (indeed, it is really much shorter 

 than the glandular part when stretched out) . 



Penial setse about ^ mm. long and in the middle 9/x thick, curved at the 

 proximal end, the distal end being bent at an obtuse angle. The distal end tapers 

 somewhat and ends in a sharply pointed, slender tip, which is recurved in a very 

 small, scarcely perceptible degree. With the exception of the naked tip the distal 

 end is ornamented by about nine oblique annulets of more or less slender, relatively 

 very large teeth which number about four or five in the half of an annulet as seen 

 in examining the penial seta from the side. The teeth which stand at the concave 

 curvature of the distal end seem to be larger than the others. 



Female organs in normal position. Ovaries large. Oviduct funnels slipper- 

 shaped. Oviduct moderately long, straight. 



Spermathecse: At first I could find no spermathecge. In a series of sections, 

 however, I found small outgrowths of the body- wall, projecting very little into the 

 cœlom. Though these outgrowths had not a distinct lumen, I believe they were 

 spermathecse in a very early state of development. There were five pairs of such organs 

 close behind the septa 4-5 — 8-9, just medial from the lines of setse h. As the other 

 sexual organs, for example the prostates and the penial setge, seem to be fully 

 developed, the stunted condition of the spermathecae is remarkable. Perhaps these 



