DESCRIPTION OF PLATE E. 



which shows the numerous bundles of muscular fibre 

 composing its walls, g and w as in fig. 4. 150 diam. 



Fig. 6. — A portion of the same coat separated out 

 with the needle. 295 diam. 



Fig. 7. — Apical part of an ovarian caGCum, from the 

 lower part of which, at c, an ovum has escaped. 

 Eventually one of these nucleated, but immature glan- 

 dular bodies (a b) will descend towards the cavity (c) 

 and develop into another vesicle with its ectoplastic 

 and endoplastic layers. The walls of the cyst are 

 studded with epithelial scales, as shown at d d. 

 Magnified 100 diameters. A more highly-magnified 

 portion of such a wall enclosing an ovum may be seen 

 in Plate F, fig. 2. 



All the preparations in this plate here described are 

 from dissections of the oviparous female of Galli- 

 pterus quercus ; numerous living examples of which 

 were kindly sent me, early in October, from East- 

 bourne, by Mr. Foran. 



The insects were dissected after treatment with 

 various fluids, such as chromic or acetic acids, alcohol, 

 weak glycerine, petroleum spirit or solution of common 

 salt, employed either to harden the tissues or for the 

 purpose of rendering the parts more evident by vary- 

 ing their refraction of light whilst viewed under the 

 microscope. 



Notwithstanding the more elaborate treatise by 

 Prof. Huxley on the anatomy of the oviparous female 

 of Aphis, I offer the following contributions : and with 

 the general remark that my camera-lucida drawings 

 confirm me in the belief that what the last author has 

 advanced as applicable to the species he examined, is 

 in agreement with Callipterus quercus, the diagnosis of 

 which occurs in Vol. hi, page 21 of this Monograph. 



