GASTEROPODKES. 317 
the grains composing the spawn, and of snowy whiteness, had dissolved, 
when numerous Nautilines swam as pure white specks amidst the water, 
no larger than those from other species of the tribe. 
I have remarked on different occasions, indeed, that Nautilines from 
the larger kinds were as small as Nautilines from the smaller ; and that 
those of the /. papillosa exhibited the cylinders with the cilia almost as if 
protruding from within, like wheels; and, when withdrawn, that the 
cylinders closed like conic frusta over them ; also, that the intestinal 
organization consisted of at least seven distinct portions. 
On studying the external configuration of the Holis papillosa, the 
observer must beware of delusion, from the contraction attendant on 
extenuation from spawning. 
Prats XLV. 
Fic. 23. Eolis papillosa: back, before spawning. 
. Belly. 
. Another specimen: back, after spawning. 
6. Belly. 
. Spawn. 
bo bo bo 
oC > 
iy) 
~J 

Note.—Besides the preceding, which I conclude to be all distinct 
species, various others have occurred, which, though less definitely cha- 
racterised, are evidently allied to the same tribe. I shall select one as 
an example, regretting that any obscurities disguised it. 
I. This may be descriptively called the Fan-head Kolis, as it cer-. 
tainly approaches more nearly to the race last under discussion than to 
any other. 
Length three lines, breadth half a lime. The anterior extremity 
dilates into two flat leaves, capable of folding together. Towards the 
side of each, a stout and rather short cylindrical tentacular organ rises 
upright from the back of the neck; and behind them are two very black 
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