ON THE ANATOMY OF THE RUMINANTS. 391 
each secondary one; and there may be quarternary lamine on each 
side of each tertiary, on either side, again, of which there may be a Page 6. 
row of papille indicating the rudiments of lamine of a fifth power; 
for, when disappearing, lamin always ends-as rows of papille. 
In the case of a transverse section of a quadruplicate psalterium 
(in other words, in one of which there are lamine of four powers), the 
quaternary folds being rudimentary, imagine it to be cut through 
longitudinally along the middle of its groove, and opened out in such 
a way that the outer wall forms a straight line, whilst the lamine 
depend from it; then the appearance will be that of fig. 1. This 
b ; e 
—+ os —— 
| | | | | 1 3, Figh, 
Diagram of transverse sections of psalterium. 
being from an actual specimen, there is a slight want of uniformity at 
b and ¢, which is usually found to be the case. The laminz of each 
cycle, or power, gradually diminish in size laterally; and it will be 
noticed that, though the organ is quadruplicate where the folds are 
relatively largest, the smallest lamine disappear at the sides. This 
is nearly always the ease, as it is also that near the orifice of 
communication with the reticulum they are stronger than they are 
further on. 
_ In different genera the relative depths of the lamine which con- 
stitute the separate cycles is not always the same. The arrangement 
depicted above is the most usual, in which the secondary folds are 
about two thirds the size of the primary, a similar difference existing 
between them and the tertiary, and so on. 
Fig. 4 is from the psalterium of @azella arabica, in which, though 
the disposition is triplicate, it is seen that the secondary lamine are 
very little larger tham the papillary rows which form the tertiary 
cycle, the primary lamin being of considerable depth. The structure 
in Cephalophus is the same, only that, the psalterium being much 
smaller, all the parts are much reduced in size, the lateral laminze 
ii 
