80 
PROCEEDINGS OF SOCIETIES, 
PLATE 2.—VOL. III. 
INTERNAL ANATOMY OF ORPHNEPHILA TESTACEA, ILLUS¬ 
TRATIVE OF A PAPER BY A. H. HALID AY, Esq., ON IRISH 
DIPTEROUS INSECTS. 
Fig. 1. The principal nervous chain. A. Supraesophagian ganglion. 
Z. Terminal ganglion. Y. The last internode, bipartite. 
„ 2. Principal viscera of the male, with the head C, and forceps Z? 
viz. : E. ^Esophagus. V. Ventricle. 0. Malpighian vessels. T. Small 
intestine. R. Colon. P. Side stomach. G. Testes; the lower half, as 
well as the connecting cord, and the Deferents enveloped in a black pig¬ 
ment, easily rubbed off—as shown at the upper part of the Deferents, V. 
Vesicles. 
,, 8. The side stomach, variable in form according to the degree of 
repletion. 
„ 4. Vesicles of male, more magnified; with the hooked outlet of 
the Deferents. 
„ 5. An outer, and—6, an inner arm of the forceps. 
„ 7. The abdominal viscera of $ seen in situ, the large ovaries 
nearly concealing all the rest. 0. Malphighian vessels. M. Follicles of 
the oviduct. Z. End of abdomen and tentacles. 
„ 8. Tentacles of female from above. 
„ 9. One of them, side view. 
„ 10. Reproductive organs of female. 0. Ovaries composed of 
numerous eggsheaths, each forming an oblong bundle. M. Follicles. 
„ 11. M. The follicles. D. Their outlets enveloped in a grape-like 
mass, and beset with pear-shaped black villi, easily detached. 
„ 12. Common oviduct, with the Spermotheca, and the outlet of the 
pair of separate oviducts enlarged below the grape-like envelope. 
„ 13. Spermotheca apart. 
„ 14. Portion of one of the separate oviducts with some of the villi. 
,, 15. Portion of ovary showing the branching of the egg-sheaths. 
„ 16. A single egg-sheath, of four chambers, and terminating in a 
very short filament. 
Vide Proceedings of Societies, page 71. 
