Scymnus brevipinna. 483 
its opening surrounded by circular fibres. From the pylorus 
to the anus was 5 feet 6 inches; the 
mesentery was very delicate. 
The duodenum, cut open, was 3 inch- 
es-wide. -Three inches from pylorus 
the canal was suddenly narrowed to an 
inch in width cut open, and for a length 
of five inches; it then became suddenly 
4 inches in width. This portion exter- 
nally has the same apparent size; but 
the remainder of the calibre is occupied 
by a cul-de-sac, 5 inches long, closed at 
the bottom ; so that in this portion there 
are two tubes, the largest closed at the 
bottom, but communicating freely with the intestine above, 
[as in the figure] ; when distended it may serve as a sort of 
valve. Fourteen inches from pylorus was a ccecal prolonga- 
tion (as in the figure), 11 inches long; 3 inches wide when 
cut open ; between this and the descending intestine was the 
pancreas, of two lobes, 18 inches long ; the left lobe one inch 
wide ; the right 4 an inch, gradually tapering toa point, of 
à pink color : the thin right lobe was spread on the cœcal pro- 
longation. dem 
Two feet from the anus was a second constriction 1 inch 
long, the walls being from 3 to 3 an inch thick ; immediately 
below this was arranged a series of membranous folds, which 
might be extended an inch across the intestine, arranged in a 
Spiral manner, leaving a central aperture large enough to 
admit the finger, following the axis of the intestine, though 
much larger following the area of the spiral: the spirals grad- 
ually increased in size to the middle, thence they decreased 
to their termination: they were thirty-three in number, and 
ceased about six inches from the anus. The fold was in gen- 
eral much injected; the whole surface covered with a very 
fine net work of lacteals ; the design of this fold is evidently 
to increase the extent of surface over which the digested food 
