17 
such objects as are likely to eject ova or to develop a stem like the 
Polyzoa, and then they can be taken out and examined under the 
microscope, a drawing made of any developing form, and replaced 
to undergo further examination as change advances. In this 
manner I have been much interested in watching the growth of 
foraminifera, which have attached themselves to these slips, and 
which, apparently, have not suftered from the trip they took out of 
the aquarium. Ina short practical paper like this, I cannot do 
more than suggest various objects of interest to be taken up and 
followed by yourselves; therefore I can only briefly describe such 
as have presented themselves to me at various times, and afforded 
me the pleasure I hope you may derive from similar observations. 
I have been much pleased by the hatching of the zoe of the crab 
and prawn, and can recommend this to your notice. Crabs and 
prawns bearing ova can be safely transferred from the coast packed 
in sea-weed. I once brought a pint of live prawns, most of them 
bearing ova, from Dawlish, merely packing them together in a 
basket in their wet state. They endured a twelve hours’ journey 
without apparently suffering, and I placed a dozen of them in the 
aquarium ; in about six weeks the young ones hatched out, and 
could be distinguished in the sunlight as clouds of tiny specks 
swimming together in shoals. They, like the crabs, are entirely 
unlike the adult form at first, and it would have been interesting to 
have observed the number of moults they underwent before arriving 
at that condition; but, unfortunately for my observations, the ane- 
mones and the parent prawns admired the young fledglings as much 
as I did, but after a different manner, and they gradually disap- 
peared. It would be better in this case to establish a separate tank 
for the study of these crustacea, removing the parents when the 
hatching was complete, for I can promise you a rich store of 
interest in observing the changes which are effected in these 
creatures in passing from the strangely-shaped zoe to the final stage 
of development. I would also suggest the study of foraminifera as 
likely to interest you. The stock may be procured from many 
sources, but the most abundant is the ooze of the oyster beds, 
where living specimens of many varieties may be found. They may 
also be found attached to sea-weeds and to old shells dredged up 
from the sea bottom, and in your tank they will soon multiply, and 
present themselves in every stage of development. In my aquarium 
various stages of the miliolide may be seen in the summer time, 
anchored up by their pseudopodia to the front glass. I have had 
also an abundant supply of textularia and rotalina. I do not point 
to these as rarities, but only to show that once get your aquarium 
fairly started, and it will form an inexhaustible store of interesting 
study. The chitonidz live well in confinement, and a study of their 
developmental changes. will repay you. The eggs are exceedingly 
_ interesting objects. The chitons deposit their eggs closely united 
