A. J. Grove 
7 
natural consequence, the alimentary canal in this part of the body is 
crushed together in a dorso-ventral direction, so that the various coils 
lie closely beneath one another. The coils also differ in arrangement 
from those present in the apterous form; but there is a general 
similarity between the form of the alimentary canal in the two stages. 
The course of the alimentary canal. Commencing at the mouth, the 
oesophagus passes in an upward direction towards the roof of the head, 
and reaching a position a little above the median vertical point, it 
curves abruptly backwards as is the case in the apterous stage, and 
passing over the transverse bar which supports the chitinous framework 
of the head, it continues in the median line into the region of the 
thorax. Here it gives place to the crop, which, however, does not lie 
obliquely in the body, but continues parallel to the median line. The 
crop is followed in the usual way by the coiled intestine, and it is in 
Fig. 1. 
Fig. 2. 
Fig. 1. The alimentary canal. Dorsal view. Semi-diagrammatic. (x40.) 
an.— anus. cld. int.— coiled intestine, crp. =crop. oes. = oesophagus, red. =rectum. 
Fig. 2. A lateral view of the alimentary canal. Semi-diagrammatic. (x40.) 
an. = anus. bk. = beak or proboscis, cld. int. — coiled intestine. crp.= crop. 
w. = mouth. oes. = oesophagus, red. =rectum. 
this portion of the alimentary canal that differences arise. The coiled 
intestine after leaving the crop makes a curve towards the left side, 
and at the same time dips towards the ventral surface of the body 
cavity. Instead of curving completely round and proceeding in an 
anterior direction as is the case in the apterous stage, the coiled 
