MiM-i'Udneous. 20o 



limit the course of lla- abtlomen, and thus render ihi' lonn of the 

 /xti/illnif re'^uhir. 



The hitter i)rcs('nts oxtonuilly numerous very irregiihir, circului-. 

 transverse ridges, corresponding to tlie layers successively deposited 

 l>y the Mantis. It may easily be conceived that these layers remain 

 distinct, as each of the halves of the nest is already consolidated 

 when the Mantis returns to it to deposit a new layer of eggs and of 

 frothy liipiid. The nest has also a generally ovoi<l form. AVhile it 

 is still fresh it is of a slightly yellowish-white colour; but in the 

 eourso of a short time this tint passes into a bright brown, whilst 

 the total volume of the nest diminishes sensibly. 



\Mien the oviposition is completed, the Mantis quits the nest by 

 climbing up vertically. A certain (juantity of liquid continues to be 

 given off, becomes consolidated as the Mantis climbs, and thus forms 

 a sort of little column, which surmotints tbc nest like a lightning- 

 conductor. 



The Mantis dies two or three days after having accomplished its 

 work. It clings by its anterior feet to a branch, extends its four 

 posterior legs, and remains thus suspended, without motion, or only 

 moving when it is disturbed, until the moment of its death, which 

 does not modify its attitude in any "way. — Annales des Sci. jS\(1. 

 .o« ser. tome xiv. art. 10. 



Echinococcus in Macropus major. 

 By H. A. Pagewstecheh. 



The occurrence of EcJdnococcus in a species of kangaroo has been 

 recorded by Davaine. The aiithor found in the thoracic cavity of 

 a specimen of Macro2)us major, killed at the Zoological Garden of 

 Cologne, a great quantity of Echinococci. They appeared to be 

 identical with the ordinary Echinococcus of man and the ruminants, 

 and, on administering them to two dogs, one of those animals was 

 found on the thirty-sixth day to contain from six to eight specimens 

 of the true Ttenia erJiinococcus. The author remarks that, from the 

 wide distribution and the isolation of the species, we may regard 

 Echinococcus as a very ancient form of l\cnia. — Verhaiu.lL Naturh. 

 Vereins zu Heidelberg, v. 



On a new case of Hyiiermetamorphosis in Paliugenia virgo in the 

 Larva-state, and Analogies of this Larva ivith the Crustacea. By 

 N. JOLY. 



Having attended for some years to the cmbryogeuy of the Ephe- 

 merina), and especially to that of Palingenia virgo, I was still unable 

 to hatch this neiiropterous insect in my laboratory. More fortunate 

 this year, I have at last succeeded in following the development of 

 the insect in the egg, and to procure its exclusion, so as to fill up an 

 important gap which I regretted to find in the interesting memoirs 

 of Swammerdam, Keaunuir, and Christian SchcfFer. Long since* I 



' Couiptes Rendus, September 184G. 



