Johnson—Pyloric Caeca of the Centrarchidae. 717 
Eupomotis gibbosus Linnaeus. 
The number of caeca in this species is the least of those 
studied, the mode being 6 and the range 5-8 (Text-figure 1). 
The variability seems equally great. The relation of the vis¬ 
cera is as before (Plate XLI, Pig. 12, Plate XLII, Pig. 18). 
The length of the longest caecum is about the same as in the 
rock bass, 13.1 per cent of the total length in ten cases. The 
intestine is 1.21 times the total length of the body in eight cases, 
being longer than in the rock bass. This is probably the result of 
the considerable quantity of plant food eaten by this species. 
The length to vent is 40.0 per cent of the length in eight cases. 
The relative lengths of the caeca indicated in Plate XLIV, 
Figures 3 and 4, show a very decided reduction of the left side 
in comparison with the right. This is partly due to the fre¬ 
quent occurrence in this species of much reduced caeca, which 
are sometimes smaller in diameter as well as shorter. 
One specimen of this species hewn in Plate XLII, Pigures 
14, 15 and 16, was abnormal in the extraordinary arrangement 
of the viscera. The caeca were yet so typical as to suggest 
that some of their individuality is preformed rather than 
epigenetic from the pressure of other viscera, although the 
latter influence is clearly very strong in determining many of 
the conditions here described. 
This species is the last of the Lepominae described. The 
sub-family has a range of 5-9, which will doubtless be extend¬ 
ed when more species are examined. 
Pomoxis sparoides Lacepede. 
There are only three American species in the sub-family 
Centrarehinae, of which this alone was available. The caeca 
are far more numerous than those of the Lepominae, the mode 
being 9 and the range 8-11. With this increase comes very 
naturally an increase in the number of cases (16 out of 69) 
where two caeca replace the pollical caecum. The intestine 
and caeca are very slender (Plate XLII, Pigs. 17, 18). An 
average of ten gave 15.2 per cent of the total length. The ab¬ 
domen is very high and short, the vent being only 40.0 per 
