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1878.] Recent Literature. 463 
. Silurian to the Tertiary ; while the portion by Messrs. Hall and 
Whitfield refer to Palaeozoic, Triassic and Jurassic fossils, and is 
illustrated by seven plates. The atlas of maps is of great beauty 
and value, and worthy of this famous Survey. 
Unirep Srates Fish Commission.—The report for 1875-76 of 
Prof. Baird, U. S. Commissioner of Fish and Fisheries, forms a 
son reports on the fisheries of Chicago and vicinity; Livingston 
Stone on the salmon fisheries of the Columbia river; Dr. C. C. 
Abbot on some fishes of the Delaware river; R. Hessel on the 
carp and its culture, and its introduction into America; J. W. 
Milner reports on the propagation and distribution of shad; C. 
E. Atkins on the collection of eggs of Schoodic salmon in 1875 
and 1876; and Livingston Stone finally states the results of opera- 
tions on the M’Cloud river in salmon breeding in 1875 and 1876. 
Lruckart’s Human Parasires.'—We feel sure that we shall 
do some one a favor, even at this late hour, in calling attention 
to this valuable and exhaustive work on parasitic worms. It is 
the most recent and trustworthy work the physician can obtain, 
and it is to be hoped that an English translation will soon appear, 
though Cobbold’s Entozoa is most excellent in its way, and the 
best English work on the subject. 
RECENT RESEARCHES ON THE NERVOUS SYSTEM OF THE HYDRO- 
ZOA."—The work before us is one of the most important contribu- 
tions to our knowledge of the nervous system of the pelagic Me- 
dusz that has ever appeared. The investigations were principally 
confined to the Geryonide, Trachynemide, diginide and A:quoride. 
The conclusions which the authors arrive at are of the highest 
Significance in relation to the question of the origin of the jee 
ous system and sense organs in the higher forms. They find 
here, as Schulze has proved in the case of the higher animals, that 
the terminal elements of the sense organs—touch, hearing, etc., are 
of epithelial origin, and also that the ganglionic and intermediary 
fibrillar system is of ectodermal origin ; further, that the termini of 
the motor nerve system were likewise primarily epithelial and at 
first formed part of the ectodermal covering of the animal 
The delicacy of the tissues that these investigators have had to 
deal with renders their manipulation difficult, but the results at- 
1 Die Menschlichen Parasiten und die von ihnen herriihrenden Krankheiten. Ein 
Hand und Lehrbuch fiir Naturforscher und Aertze. Von Prof. RUDOLF LEUCK- 
ART. 2 Bande. Leipzig und Heidelberg, 1863-1876. 8vo, pp. 766, 882. With 
numerous woodcuts. : 
? Das Nervensystem und die Sinnesorgane der Medusen Monographisch darge- 
stelt. Von Oscar und RICHARD Hertwic. 4to. pp. 186. Taf. 10. Leipzig, 1878. : 
