Iviii 



Cliapelle, and the Junonia ? Pluto (Vanessa Pluto, Heer, Nouv. 

 Mem. Soc. Helv. 1850, pi. 14), from the Lower Miocene marl- 

 stone of Radaboj, in Croatia, which had been regarded by the 

 American Lepidopterist, Mr. W. H. Edwards, as an Argynnis. 



In his new work, on the ' Geology of Oxford and the Valley of 

 the Thames,' Professor Phillips has also figured fossil insects 

 belonging to the genera Buprestidium, Curculionidium, Hemero- 

 bioides, Blapsidiura, Melolonthideum and Prionideum from Eye- 

 ford and Stonesfield. 



Embryological Development and Metamorphoses. 



The development of the ovum is a subject to which great 

 attention has lately been attached, especially with reference to its 

 connexion with the so-called primitive forms of life in the Animal 

 Kingdom, and I need scarcely remind you that this was the 

 subject upon which Sir John Lubbock especially dwelt in his 

 Presidential Address in 1867. Several highly important memoirs 

 have subsequently been published, to the most recent of which 

 I must direct your attention. 



The Embryology and earliest stages of development of two 

 species of Dragonflies and of a species of Thysanura belonging 

 to the Genus Isotoma, have formed the subject of an elaborate 

 treatise by A. S. Packard, jun., being the second memoir of the 

 Peabody Academy of Sciences (Salem, Mass., 1871), in which the 

 author shows that in their earliest stage these animals belong to 

 two distinct sections, namely, those in which the germ is either 

 an endoblast or an ectoblast (that is, the primitive band is deve- 

 loped on the outside or on the inside of the yolk) ; another result 

 appears to be that the supposition entertained hy some writers 

 that the eyes of Crustacea and insects represent limbs, and 

 require a distinct segment of the head for their primal develop- 

 ment and sujjport cannot be maintained, and that the head-joints 

 are only represented by the antennre, mandibles, maxillae and 

 second maxillse or labium. 



Mr. Packard has followed up the same subject in his " Memoir 

 on the Embryology of Chrysopa, and its Bearings on the Classi- 

 fication of the Neuroptera" (published in the ' American Natu- 

 ralist,' vol. v., and reprinted, with additional notes by the author, 

 in the ' Quarterly Journal of Microscopical Science,' April, 1872). 

 Here the author states that, with reference to the position of the 



