REVIEWS. 433 
erly k on Crustacea in 1785) and was known to be the young of the little 
Cyclops and Cypris, which swim in fresh water and tidal pools; and the 
strange Zoéa was made known in 1802 by Bosc, who described it as an 
Entomostracan under the name of Zoe pelagica. That, however, the Zoé: 
ea ae _— was shown by J. V. Thompson, in 1836, and that 
E our e. a the shrimp began with a Nauplius "e is a Eat more 
y, and so remarkable in its bearings on t 
Fig. 72. the Crustacea, and the ilosophi E 
of the Crustacea generally, that à expl 
nation of how crabs and shrimps £ grow 
may be welcome to our re aders. 
summary of the facts here eee we 
are especially indebted to Fritz Miiller’s 
* Für Dar win,” a book called forth by 
Darwin’s Origin of Species, and w ritten 
by a strong and able advocate of develop- 
mental views, and which has just been 


abo 
sci in a small fresh water aquarium, when they closely resemble young 
venu Indeed the spiders (Arachnida) seem in the young of their de- 
: forms to mimic > wonderfutty the young et vade Crustacea, so that 
he two forms 
à Ls significant fact 
at these two great 
pac seem to run into 
e 
a 
^ young Milak and the 
ler à young shrim 
racing tl 
1eir life histor 
farther : 

p 
forms t 
raci 
y hind the relationship of the one to the crabs, and of the other 
€ spiders, that we realize that the two worlds seem to touch 
AME 
R. NATURALIST, VOL. III. 55 
