324 THE DOLABELLINAE. 
tively small, much less than Tethys in its proportionate dimensions. The’ 
second, or triturating stomach lies upon the left anterior face of the posterior 
visceral mass, its long axis being directed downward, inward, and forward, and 
opening into the large saccular third gastric division. The second stomach 
has a thick glistening yellowish muscular wall, and is cylindrical in form, measur- 
ing 14.0 mm. in length by 22.0 mm. in diameter. Upon its inner surface are 
borne several rows of large strong horny teeth, which nearly close the lumen 
as they meet in the centre. They are readily detached from the plate-like eleva- 
tions of the wall bearing them. Plate 10, fig. 1 illustrates in an outline drawing 
the relative size and position of these areas, the stomach having been slit length- 
wise and opened out flat, and the teeth being all removed; a is the posterior 
end of the oesophagus, b, the ingluvies, or first stomach, c the thick-walled second — 
stomach, and d, the roomy third division. 
The largest teeth of this first grinding stomach are of a dark amber color 
and have the approximate form of a four-sided pyramid, the very convex base 
rhomboidal in outline, the sides somewhat concave, and the blunt irregular apex 
almost directly above the middle of the base (Plate 10, fig. 5). These largest 
teeth reach a height of 10.5 mm. with basal dimensions nearly the same, and 
are borne in a circle midway of the organ. 
Behind these and alternating with them is a single row of medium sized — 
teeth and in front of them two more rows, the nearest of medium size, the 
most anterior quite small. The teeth of medium size are of the same color 
and shape as the largest ones, though often more compressed laterally (Plate 10, 
fig. 2, a and }, fig. 8, 10). About nine teeth make up this group, and they 
pass over into that of the smaller size, in which the tooth is strongly compressed 
and becomes somewhat wedge-shaped (Plate 10, fig. 4, a and b). The tallest 
central part of such a tooth is occupied by a slightly curved axial portion of a 
lighter color, in which the parallel lines of growth are strongly marked. This 
flattened shaft extends upward from the middle of the base and forms the cusp 
of the tooth at its apex, and appears as if imbedded in the remainder of the 
chitin, especially when viewed as a transparent object. The basal length of 
the largest tooth of this type is 6.0 mm., its height 6.5 mm. and its width 4.0 mm. 
The smallest teeth form a fourth type in shape, that of a slender conical 
spine, (Plate 10, fig. 3). Several of these are found in the anterior row of the © 
second triturating stomach, but they are more characteristic of the third gastri¢ 
division (Plate 10, fig. 1,d). Here they are smaller (Plate 10, fig. 6), and very — 
abundant, being scattered closely over the whole inner lining. Each of these — 
