142° Journal of the Asiatic Society of Bengal. [N.S., XVIII, 
regarded as performing the function of excretion in precisely 
the same way as the urinary tubules of Leeches or Arthropods. 
Now, quite apart from the experimental facts which disprove 
the idea of glomerular filtration, there exist other considera- 
coele or cavity con taining water which receives excretory matter 
and is drained off to the exterior? either by the nephrostomes 
to be the precursors of a haemocoele (eg. the parenchymal 
spaces of Helminthes and Nemertines and the blastocuele of 
Rotifers. Entoproct Polyzoa and many larvae) or are haemo- 
ceoles (e.g. the perivisceral sinuses of Arthropods) are provided 
respectively with nephridia with closed inner extremities provi- 
ded with flame-cells® and with renal tubes also closed inter- 
nally and devoid of flame cells ;+ that is to say, the fluid in 
nephrostomes or any other outlets. Further, it is extremely 
significant that when the coelom, drained in most animals by 
nephridia with nephrostomes, becomes secondarily connected 


Or the urinary tubules of Loph 
saa oo have no glomeruli in conne 
obranch fishes, which, according to 
. B ith them. 
y friend wg assistant in Allahabad, Dr. Karm Narain Bahl, has 
( 
: : of t ) 
conserving the water which would otherwise be lost by drainage of cuelomic 
fluid 1s good evidence that the capillary pl xus round the nephridial tubules 
has in earthworms nothing to do with absorption. Seealso the preceding 
: P = 
nf. Uame-cell”’ flagella of course play the part of the collar-cell 
flagella of Sponges, which is to drive fluid in the required direction 
mag 3 he a ] 
cilia in the Malpighian capsules of the frog and other lower Vertebrates) 
sta i oO 
ee Ee ee ee ie 



