100 FRESH-WATER FISHES OF NEW JERSEY. 
In the present paper we propose not only to mention the 
results of the study of the habits of the species partieular- 
ized, but to refer also to observations we have made, that 
apply to the fishes of these waters as a class, rather than to 
any single species. These observations we will give first, 
and then notice separately the more interesting species, in 
conclusion. 
We would first call attention to alterations in circum- 
scribed faune. These changes are what have occurred lately 
in the small brooks, either emptying into the river directly, 
or tributary to the two large creeks, the Assunpink, and 
Crosswicks. We give only such instances as have occurred 
under our own notice. In the month of June, 1867, we 
fished the entire length of a never failing spring-brook, re- 
markable always for the number of specimens, if not of 
species. The fauna consisted, as usual, of chubs (Semotilus 
rhotheus and S. corporalis) ; dace (Argyreus atronasus), and 
minnows (Fundulus multifasciatus). The abundance of these 
species was relatively as named. During the first week of 
July following, a heavy, sudden fall of rain caused a consid- 
erable rise in the brook, and the extra bulk of water rushing 
over the narrow bed, altered the character of the brook so 
slightly, that it attracted no notice from those accustomed to 
seeing it daily. On the subsidence of the water, no cypri- 
noids, or in fact other fish, eould be found, although we left 
hundreds in the stream. A week later we found a few 
roach (Stilbe Americana) ; they were never seen by us pre- 
viously, in this stream, and still later, young mullet ( Moxos- 
toma oblongum). No chub have since been seen in this brook, 
which during the summer past (1869), was well tenanted 
with the species substituted in 1867, for them. During the 
last summer a few red-fins ( /Typsilepis cornutus), and shiner 
(Hypsilepis Kentuckiensis), made their appearance. In a 
similar instance, happening in 1868, a familiar creek, teem- 
ing with eyprinoids, but with representatives of no other 
family, was found after a freshet to have lost a large number 
