1919. ] The Sixth Indian Science Congress. exlix 
yes. The tentacles are peculiar in appearing very late. The median 
their aig appearance in the larvae of pe Be polychaets. 
The larvae were kept developing for over 6 months and during 
pss pha Be the number of sasha Pog! eloped was about 170. Judging 
om this it is inferred that growth in these worms is very slow and that 
worms dug up from peeel ha ‘ae as many as seven hundred segments 
ce : : : 
ull de escription of the Adyar worm is given and some of the 
individual variations in the gills also noted. 
cide a new type of Annelid excretory system in earth- 
ms.— By K. N. Bau. 
The two types of excretory systems recognized in Annelids are the 
** meganephric’”’ and the ‘‘ plectonephric.” In the earthworm investi- 
alimentar ary can al all along its gO The terms ‘‘ diffuse’’ and ‘‘ plec- 
tonephric”’ are clearly inapplicable to ‘the ee oo in this earth- 
worm since there is no network anywhere in the s 
The elaborate system of ducts manitat oak ith nw nephridia, and 
never — gas so far as I know, ar pean of a pair of septal excretory 
ducts on ptum and a pair of supra-intestinal excretory ducts 
situated Besa the forest eid It is these ducts that communicate 
segmentally with the lumen of the gut. 
The erga ans of calcareous opercula by longicorn larvae 
oup Cee: (Coleoptera. Cerambycidae).—By 
F. “é BEE 
Species of longiorn ae of the group Cerambycini close their pupal 
chambers with deposits of calcium sith ito secreted in the Malpighian 
see The deposits re the form of variously-shaped opercula or of a 
mplete internal lining of lime, to which is sometimes added a film of 
chitinons aa ie al. 
opercula of the genera Aeolesthes, Derolus, Dialeges, Diorthus 
Hoplocera: ” BS 2 and Plocaederus are described and the ‘method of construc- 
tion out 
eam) ions are put forward to explain the object of the setditons 
The possible objects are ia) rotection against natural enemies, parasite: 
and predators, (b) protection against intrusive moulds an: parasitic fact. 
d ; ve 
deine ped opere 
The life-history of a midge, Culicoides (oxystoma ?), with 
remarks on the early stages of Ceratopogon. —By P. G. 
PaTEL. 
Very few observations have previously n made on the bionomics 
of Indian midges. The eggs of some four casted of Culicoides (including 
