212 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
sections, though in surface views they appear very plainly ; inside the- 
coat of circular muscles all the fibres are transversely striated. The 
teeth form six distinct arches, and are united with the muscular coat 
only at their sides. The attachments of the adjacent teeth to the mus- 
cularis are separated by a longitudinal ridge, a, which runs unbroken 
through the length of the crop, separating the neighboring rows of teeth 
(compare a surface view Fig. 54 a). Each tooth is tripartite, having a 
central -pointed division, d', and two lateral protuberances, d", which 
Wilde terms "molar" (mahlzahnartig). The shape of these is best ex- 
plained by the figure. The whole proventriculus is lined by a contin- 
uous resistent cuticula, which rests upon a cylinder-epithelium, that 
varies greatly in height in different regions of the teeth, as is plainly 
shown in Fig. 58, cp. The epithelium rests on a layer of connective tissue 
conn., beneath which is the space left by the dental arch; this space, 0, 
corresponds to a large canal which runs under each row of teeth. Ex- 
amined from the surface, Fig. 54, the same disposition of the parts can 
be seen, though less plainly. The central process of each tooth is pointed 
and inclined backwards, so as to slightly overlap the next following 
tooth. Certain of the anterior " molar' 1 protuberances are distinguished 
from the posterior, by having three dark colored projections of their cu- 
ticula. The cuticula is armed with spines upon the central dental divis- 
ion, and with numerous bristles upon the " molar " protuberances and 
interdental ridge. A side view, Fig. 55, is also given in order to make 
the relation of the teeth to one another as plain as possible. 
In the anterior part of the proventriculus the teeth are simpler in 
form, and the longitudinal ridge and "molar" protuberances are want- 
ing. The cuticula gives off a dense coat of long hairs. The edge of 
each tooth is deeply serrated on both sides of its point, instead of being 
merely somewhat roughened as in the posterior part. Finally these an- 
terior teeth are convex on their front, concave on their hinder sides. 
They become smaller as we go forward, the rows spreading apart as they 
widen out to form the crop. 
Posteriorly the rows of teeth stop quite suddenly. The interdental 
ridge runs somewhat further on, and is rounded off at its termination. 
On the last five or six teeth the middle process gradually loses its prom- 
inence, and on the last two the " molar " processes are also very much re- 
duced. 
The total number of teeth in each row is twenty three or four, of which 
eight or nine belong to the anterior and fifteen to the posterior division. 
In Gryllus campestris and domesticus the crop, likewise, forms two divis- 
ions, in the posterior of which there are fifteen teeth in each row. It is 
to the posterior division alone that Wilde (1. c.) restricts the name pro- 
ventriculus, but I cannot see what grounds he has for so doing, for the 
two parts have essentially the same characteristics. 
Stomach. — This name I apply to the ventriculus of authors, the Chy- 
lusmagen of the Germans, Fig. 45, ven. Of no part of the digestive 
