SYNOPSIS OF FHASMIDjE. 9 



considerable space beneath the abdomen, so that fewer segments 

 appear on that part than above. The concavity of this is covered 

 above by a terminal scale and bifid process, constituting the tip of 

 the abdomen on the upper part. On raising this valve, an ovum, 

 nearly of the size of a pea, but of a more lengthened form, was dis- 

 covered lying in the cavity beneath ; and on inspecting further into 

 the cavity of the abdomen, a great many more ova, exactly similar, 

 were found, to the number of five- or six-and-twenty, some still 

 remaining in the upper part. These eggs are of a slightly oblong 

 shape, but flattened at one end : they are of a brown colour, and 

 marked over with numerous impressed points ; and have on one 

 side a mark or double-waved line, so disposed as to represent a 

 kind of cross, as if carved on the surface. The flattened end is sur- 

 rounded by a small rim or ledge, and seems to be the part which 

 opens at the exclusion of the larva, since it readily separates from 

 the rest." 



Dr. Muller has also described the ovaries of one of the species, 

 Bacteria arumatia, in a paper, which points out a connexion between 

 the dorsal vessel and the ovaries, published in the ' Nova Acta 

 Physico-Medica Academic Csesareae Leopoldino-Carolinee Naturae 

 Curiosorum,' torn. xii. pars 2., 1825 ; which paper was reviewed in 

 the ' Zoological Journal,' iii. p. 257, from whence I have copied the 

 following account : 



" The ovaries, which occupy the whole length of the abdomen, 

 consist of about fifty conical tubes, the bases of which communicate 

 with the oviduct of each side. The tubes are from four to five 

 lines in length, and contain each from eight to fourteen eggs in 

 various stages of development, together with certain other parts, 

 which appear to furnish the materials for their growth. The eggs 

 decrease in size towards the apices of the tubes, which pass in- 

 sensibly into a very fine elastic filament. These filaments, of equal 

 breadth throughout, are inserted, at their opposite extremity, into 

 the dorsal vessel, with the inner lining of which they are unques- 

 tionably continuous. They contain a granular, medullary, irregular, 

 and frequently interrupted substance, which is continued from the 

 interior of the dorsal vessel, and lies in immediate contact with the 

 contents of the tubes. When these filaments," observes the author, 

 " have once been seen, the idea of a mistake can no longer exist. I 

 have shown thern to many ; the connexion is so frequent, so ob- 

 vious, and so circumscribed, that there is no occasion to employ a 

 microscope to be convinced of its existence. I have never heard 

 a second opinion on the subject. The connecting filament, however, 

 does not merely unite the dorsal vessel with the apex of the ova- 

 rian tube ; it passes into the interior of the latter, and lines its 

 internal surface in immediate contact with its contents, and expand- 

 ing as it advances, terminates near the union of the tube with the 

 oviduct, in a free edge. The portion which is thus enveloped by 

 the tube is capable of being separated from it ; it alone contains 



