Recent Literature. 
[February, 
116 
the worms to the Mollusca, the Echinoderms and the Ccelenter- 
ates to the Protozoa. While we cannot agree with the learned 
author in some of his views on 
classification, the reader may be sure 
that the Volume is a careful and reli¬ 
able presentation of the more inter¬ 
esting facts,regarding these creatures, 
and which should be the property 
of every well in¬ 
formed person. 
In these days 
one can hardly be 
considered as lib- 
Fig. 
i. — Sacculinds, erally educated, 
carcini. Natural size. 
is not con¬ 
versant with the physical theories as 
to the origin of the different forms 
of life; and as there are several ave¬ 
nues which lead up to the Vertebrates 
from the lower animals, no wonder 
that a knowledge of the lower ani- fig. 2 —PeUogaster curvatus; be- 
mals, especially the groups described" neath is the larva or naupliusof Par- 
and figured in this volume, is quite tiieno P ea > magnified 200 times, 
requisite. It should be said, however, that the anticipation of 
vertebrate characters discoverable in the Ascidians, the Worms 
and the Molluscs, are recondite, and only appreciable after care- 
FlG. 3.—Lima flying through the water by opening and shutting its 
ful embryological and anatomical studies. This subject is only 
incidentally referred to by Prof. Schmidt, and perhaps the intro¬ 
duction of too many anatomical cuts and schematic drawings 
would be considered as out of place in such a work as this. 
