STRUCTURE OF THE OVARY. 
201 
in Anabrus only, Fig. 64, Tu, continuous with the tunica externa of the 
cord ch. The appearance of the tunic is represented at Tu, the rest of 
Fig. 61 being drawn with the objective focused lower. The membrane 
is thin, delicate, and entirely distinct from the follicular epithelium, 
which has shrunk away from it, as seen in the figure. The external 
tunic is very transparent, and contains more or less nearly oval, flattened 
nuclei, with no distinct outline or apparent nucleolus, and containing a 
single layer of flue granules, all of which are darkly stained by hsema- 
toxiline. Apparently every granule lies by itself, and is separated from 
its fellows by a clear space, only very slightly tinged by the logwood. 
Toward the upper end of the tube the nuclei are smaller and he closer 
together. They lend a peculiar character to the tunic, and remind one of 
the similar nuclei in the tunica externa of the spermatic tubes of locusts. 
The peculiar net-work of connective tissue which surrounds the ovary, 
and which is represented in Figs. 17 and 62, has already been described. 
Anterior ccecum of the oviduct. — By this name I designate the narrow 
convoluted anterior prolongation of the oviduct in locusts, which Dufour 275 
calls the " boyau borgne et flexueux, qui termine l'ovaire en avant," and 
which is represented on his Plate II, Fig. 18 c. In a transverse section 
through the middle of the abdomen, the two coeca are cut across sev- 
eral times, ovd, in Fig. 1. It is then seen that they are tubes with thick 
walls and a cavity of moderate size. The main thickness of the wall is 
made up by the epithelium, the real character of which is obscure in my 
preparations, there being a great many oval nuclei scattered through it 
at all levels, while the limits of the single cells do not appear. Outside 
the epithelium is a distinct but thin layer formed by the connective tis- 
sue, tracheae, and muscular fibres, which, as far as I can make out, seem 
to run circularly. It is very possible that in better preparations longi- 
tudinal fibres will be likewise found. 
Uterus of locusts. — I employ this name to designate the enlarged 
upper end of the oviduct, or that division which Dufour in his classical 
memoir calls the " calice." 276 Of this organ I have obtained some very 
beautiful preparations from QSdipoda sordida. If the whole uterus just 
before the eggs descend into it be hardened in alcohol and then exam- 
ined, it will be found to be compressed laterally. With a very sharp 
razor it may then be cut in halves, so as to obtain two flat pieces ; some 
granular matter and coagulated secretions will be found adherent to 
the inner surface, which may be removed under alcohol by the careful 
use of a camel's hair brush. The piece may then be colored with hsenia- 
toxiline, and mounted, with the inner surface upwards, in Canada 
balsam. Part of such a preparation is represented in Fig. 21. The in- 
ner surface is seen to be lined by a beautiful epithelium, which is thrown 
up into broad transverse folds, with intervening depressions of about 
2,5 Recherches Anatomiques et physiologiquea sur les Orthopteres Memoires a 1' Acad. K. des Sci. 
Inst. France, 1834, p. 324. 
276 Dufour: 1. c. PlancheH., fig. 18. 
