270 Scientifie Intelligence. 
be cool it would be better in many cases to employ first B.II, and in 
the case of all marine animals washing first in fresh water is desirable, 
though not essential. If the specimens rise to the surface they should 
be kept under by mechanical means. After remaining for several hours, 
or a day, varying according to its size and the weather, in the B.L solu- 
tion it may be transferred to A. II, and then successively to A. II, and 
of their highly poisonous nature, a fourth dilution of solution A.I, cor- 
responding in strength with B.I, but without the arseniate of potassa, 
may be substituted, and in many cases will do nearly as well, if the 
ee oer " . . care- 
fally watched and transferred to the stronger solutions as soon as possl- 
ble, so as to avoid incipient decomposition while in the first fluids. 
66. eke 
Witttam Srimpson. 55 pp. 8vo. 1865: wi 2 From t 
Smithsonian Miscellaneous Goll i oe 
the anatomy of the Hydrobiine, owing to their diminutive size, bas, 
with few exceptions, caused con hologists to classify them merely from 
the form and other characters of the shell, and such parts of the animal as 
entertaine 
ferring a part of them to the genus Paludina, o 
rs to Melania, 
: a, wc. while other authors have mor perly proposed for 
the reception of certain types, the genera Amnicolat Pomatiy age Boe 
Wis no BT a Re eR) ke gee oR ey eer ce ES 
ean be seen protruded when in motion. Hence, rather widely different 
rtamed in regard to their generic relations, some re 
