720 Wisconsin Academy of Sciences, Arts, and Letters. 
is most space, that is to the left of the main portion of the 
stomach. 
The caeca were measured to the tip of the longest branch. 
The result shown in Plate XLIV, Figure 7, differs from M. 
dolomieu only in having X shorter than IX. The branching 
is nearly always bifurcating, as shown in Plate XLIII, Figures 
1 and 4, where some much-branched caeca are drawn. The 
few cases where the caeca apparently branch into three 
(Plate XLIII, Fig. 8) doubtless arise from the close ap¬ 
proximation of two points of bifurcation. 
The primary bifurcation is near the base of the caeca with a 
mode of 9 per cent of the length to the end of each tip from 
the base. Its position is not apparently greatly altered if 
there is further branching distal or not. The secondary bifur¬ 
cation is most frequently 15-17 per cent from the base. The 
tertiary and quaternary bifurcations are too irregular to fall 
into a regular frequency polygon. As a whole, however, the 
branching is distinctly near the base of the caeca. 
The caeca in this species are very slender and pointed in 
comparison with M. dolomieu , where they are thick and round¬ 
ed. The food is fish, while that of M. dolomieu is primarily 
crayfish,. The enteric interval is replaced by a deflection in 
the line of caeca as in the previous species. There are usually 
two caeca between the two intervals. 
SUMMARY AND CONCLUSIONS. 
1. The pyloric caeca of the six species of Centrarchidae 
found in the vicinity of Madison, Wisconsin, are high¬ 
ly variable in number. The ranges overlapped, making 
a range for the order of 6-15. 
2. A loop of the intestine causes an interval between caeca, 
which, with the other interval formed by the stomach, 
separates a few caeca from the rest’. In the Leppminae, 
where the caeca were less than nine in number, but¬ 
ene caecum has this position 
3. The lengths of the several caeca have a characteristic rela¬ 
tion for each species. 
