130 
POPULAR SCIENCE REVIEW. 
EXPLANATION OF PLATE VI. 
Fig. 
V 
V 
V 
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V 
1. Hinder segments of a young larva, showing the fatty matter with 
“ovary ” or “ germ stock ” imbedded in each lateral mass. 
2. Ovary of a larva, 1 mm. long and T7 wide — filament of connection 
with Malpighian vessels — cellules. 
3. Ovary in which commencement of future pseud-ova appear. 
4. Ovary containing seven young pseud-ova. 
5. A pseud-ovum free — vitellus forming. 
6. Do., almost filled with vitellus, the cells reduced in number, and 
(polar cells) congregated in the clear end. 
7. A portion of ovary from which nearly half the pseud-ova have 
already detached. 
Fig. 1 from Wagner — Figs. 2 to 7 from Ganine — Figs. 8 to 16, 
Pagenstecher. 
8. A larva with large ova, in which the embiyonal development is 
proceeding. 
9. 10, 11, 12, 13, 14. Progressive stages of development of ovum up 
to period of embryonal layer (bourrelet.) The next stages are 
seen in Fig. 8. 
„ 15. An embryo withdrawn from its envelope before maturity. The 
dorsal portion is bulged by the residual vitellus. ■ The eyes, the 
armature of spines for locomotion, the adipose mass, the oeso- 
phagus and intestinum rectum, with Malpighian vessels, are dis- 
tinguishable ; also the ventral cord and ganglia with supra- 
oesophageal ganglion. 
,, 16. A full-sized larva, with five young larvae moving freely in its in- 
terior. The anterior and posterior extremities of the parent 
larva are retracted and separated from the exterior chitinous 
envelope, so that the head of the nymph is seen under the skin 
of the head of the parent larva. 
N.B. — Fig. 5 is not in direct continuation with Fig. 4. It represents the 
later development of one of the u ovules ” in Fig. 4. 
Fig. 7 represents the ovary containing ovules in different stages of de- 
velopment between that shown in Figs. 4 and 5. 
N.B. — The colour is only intended to distinguish the fatty tissues and 
Malpighian vessels in the diagram, not as the colour of nature. 
BIBLIOGRAPHY. 
Wagner in Zeitschrift fiir Wiss. Zool. 1863, page 513. 
Meinert Do. Do. 1864 „ 394. 
Pagenstecher Do. Do. 1864 „ 400, and in Zeitschrift, 
1865, 4th part. 
Ganine, in Bulletin de l’Acad. de St. Petersbourg, 1865. 
Annales des Sciences, November, 1865, page 259. 
Dp. Do., letter from Meinert, July, 1866. 
Leuckart in Wiegman’s Archive, 1865, p. 286. (Translated by Mr. Dallas, 
in March No., 1866, of Mag. Natural History.) 
