PERILS OF BABY-FARMING 179 
(Linn.), Eupagurus Bernhardus (Linn.), Porcellana longi- 
cornis (Linn.), Galathea intermedia, Lilljeborg, and Munida 
rugosa (Fabricius). — 
It will be remembered that the larval forms of Crus- 
tacea often show not the smallest resemblance to the 
adults, and also that it 1s extremely difficult to breed in 
confinement -those which pass through many transforma- 
tions from the egg to the perfect condition. In this in- 
terval at every moult, the shedding of the skin is attended 
with danger. The movement, the saltness, the temperature, 
of the water in which they are kept should correspond with 
the conditions they would have experienced in their proper 
marine home. When all this has been suitably cared for, 
the supply of appropriate food must be considered, and this 
will probably not be the same for all the stages. When 
several specimens occupy a common nursery the more ad- 
vanced are very apt to destroy the less forward, and the 
creatures being as a rule very small there are risks of 
confusions, the larvee of distinct species being perhaps 
mistaken for the stages of one and the same species. In 
calm weather, and, at least, in the latitude of Great 
Britain, especially, though not exclusively, after dark in the 
months of August and September, it is easy in many parts 
of the sea by means of a surface-net to obtain an abundance 
of larval forms, but there is a great difficulty in determining 
the species and genera to which they severally belong. 
Being minded to connect together the several stages of a 
crustacean’s life with some approach to certainty, Professor 
Sars made a practice of carefully drawing and dissecting 
the forms he met with, and then by comparison of a long 
series he was able in numerous instances to assign them in 
proper sequence to species of which the adults were already 
known. Considering the vast numbers of the Crustacea, 
it is evident that there is valuable work to be done on these 
lines, enough to occupy a crowd of zoologists for many 
years to come, and the plan is available for many who have 
no access to the constantly improving resources of the 
modern scientific aquarium vr marine biological station. 
