Iftvertebrata, Tjoological Collections, ^|# 



opening next it is a little reflected outwards ; the aperture is almost oval, 

 and notched on the right side ; the rounded spire forms a deeper suture ; 

 the violet colour always occupies the lower part, but it is not so suddenly 

 separated from the colourless portion ; on the contrary, it disappears 

 insensibly. Without this violet colour, and the locality, I should have 

 taken this shell for the Lymnesa auricularis, Lamk. ; but the animal, which 

 Was still partly in the shell, enabled me afterwards to distinguish this so 

 \vell characterized genus. In this, the length of the shell exceeds its 

 diameter. 



Found at the end of May, 1829, at Pointe-aux-Feuilles, (Isle of Mauritius.) 

 — JuLiEN Desjardins Ibid. 



Animal of the Bdemnite. — M. de Blainville recently presented to the 

 Academy of Sciences of Paris, a memoir by M. Henry of Perpignan, on 

 the molluscum to which the belemnite belongs. M. Henry has found, in 

 the commune of Saint Michel de Vas, in the department of Tarn, the body, 

 together with all the parts, of the fossil known under the name of belemnite. 

 He sent to the Academy some pieces of the rock where these remains are 

 contained, and very accurate drawings which he had made on the spot. He 

 also adds a geological chart of this canton. MM. de Blainville and Brong- 

 hiart are intrusted with the examination of the memoir. 



On the Mode in which Insects deposit their Eggs. By M. Vallot The 



knowledge of the form and disposition of the eggs of insects is of the 

 greatest importance in entomology, as it will enable the observer to decide 

 immediately on the insect to which any e^gs he chances to meet with 

 belong. It would even be desirable for naturalists to collect carefully all 

 tbat may occur to them on this subject, as a means of preventing the havoc 

 committed by many insects on our fruit trees. 



The red hairy masses situated on the trunk and lower surface of the 

 branches of the linden tree, mark the eggs of the Bomhyx dispar. The 

 red hairy masses on the leaves of hedges and fruit trees contain the eggs of 

 the Bomhyx Chrysorrhcea ; the small caterpillars spin together, and form 

 those white bags so common on the trees during winter. The grayish hairy 

 masses, disposed spirally around the branches of trees by the female of the 

 Bomhyx ianestris, are very apparent after the fall of the leaves, and may be 

 collected during winter. We also see in winter the ring formed by the 

 imion of the smooth eggs disposed circularly around the branches of fruit 

 trees by the Bomhyx Neustria. The Bomhyx of the willow tree applies its 

 eggs against the trunk of the willow and poplar, and covers them with a 

 layer of gray varnish to protect them during winter. The solid silken shell, 

 armed at one point, in which the eggs of the great Hydrophylus are contained* 

 is known ; as also the almost cylindrical mass, with a serrated crest, in 

 which the eggs of the Blatta orientalis are enclosed. There is also frequently- 

 found in quames a yellowish ovoid mass, of large size, like parchment, and 

 divided into small cells ; this is a collection of the eggs of the Mantis 

 oratoria. Sometimes there are met with on the stalks of vegetables, and 

 on the leaves of the thistle, brown or even black masses, the granulated 

 surface of which may be compared to that of the Sphceria digitata ; these 

 masses are formed by the eggs of locusts, deposited in the air instead of in 

 the bosom of the earth. The female much pressed to rid herself of her 

 eggs, lays them on the first object she meets with ; the viscid substance 

 surrounding them is soon dried, the mass blackens in the air, the action of 

 which being too rapid, destroys the organization of the eggs, which are 

 therefore never hatched. In speaking of locusts, M. Vallot mentions a 

 disease to which these insects are subject ; it consists of an increase in 

 the size of the belly ; the abdomen, prodigiously distended, induces such a 

 state of weakness, that the animal dies on the walls or vegetables on .which 



