164 Miscellaneous. 
- this phenomenon the intestine loses the horizontal position with 
apertures directed downwards, which it at first possessed, and passes- 
gradually through two other positions :—1, one vertical with aper- 
tures directed towards the posterior surface of the larva (which, as 
in the Hscharinee, becomes the anterior surface of the adult); the 
other horizontal and with apertures directed upwards. 
The first position represents a state precisely analogous to Loao- 
soma, with the anus above and the cesophagus below ; the second is 
that of Pedicellina. 
III. While the digestive tube is undergoing this rotation, the 
vestibule divides into three distinct parts:—1l, the inferior one, 
which bears the circlet, and of which the elements come to form the 
gland of the foot, which is also visible at a certain epoch in the 
Pedicellina ; 2, the superior one, which follows the digestive tube 
and becomes isolated to form the tentaeular chamber; it is this 
portion that will give origin to the tentacles; it afterwards places 
itself in relation with the exterior by means of a cleft-like invagi- 
nation of the ectoderm; 3, the median portion, which becomes de- 
generascent to give origin to the mass of globules, which at first 
fills the cavity of the peduncle, and each of which afterwards be- 
comes converted into a stellate cell of the supposed colonial nervous 
system. 
TV. There remain the two enigmatic organs of the ectoderm 
(organs of sense) which a recent author (Hatschek) represents as 
playing so important a part. These, in my opinion, are nothing 
but provisional organs; they are both thrown up upon the dorsal 
surface, where they finally disappear by degrees. No doubt we 
must recognize in the two sete described by Salensky upon the 
dorsal surface of Lowosoma crassicauda the remains of the anterior 
organ of sense, which, according to my investigations, comes to 
occupy this position.—Comptes Rendus, June 27, 1881, p. 1527. 
On the Structure of the Oothecw of the Mantides, and the Hatching 
and first Moult of the Larve. By M. C. Bronentarr. 
Several groups of Articulata surround their eggs with a common 
protective envelope. Sometimes it is in the body of the female 
itself that this agglomeration is effected (Blattina); sometimes, on 
the contrary, the female constructs the protective shell and deposits 
her eggs in it (Spiders, Hydrophili, Mantina). 
Several authors, such as Pagenstecher, Roesel, Prof. E. Perrier *, 
and M. Henri de Saussure +, have studied the egg-cases or oothece 
constructed by the Mantes. In May last I brought from Algeria 
some oothece of Mantes; and I have thus been able to witness the 
emergence of the young larve. 
The egg-cases of the Mantes are deposited upon branches of 
shrubs or upon stones. The structure differs but little in the diffe- 
* Ann. Sci. Nat. Zool. 5° sér. xiv. (1870). 
+ Mission Scientifique au Mexique, 1872. 
