"The granulation is in a marked degree different from that of the other pieces. The air pores which in the other specimens appear like a comet with a tail are here only small indentations without any tail; the shell also is only half the thickness, is much finer, and presents an aspect so diverse that the difference is detected by the most careless observer, even when the pieces are all mixed. These fragments belonged to the egg of much smaller birds, the embryo of which required less strength in the shell. Yet the colour, quality and locality of that shell clearly point to a bird of the same family as _Aepyornis maximus_--in short, a smaller and more delicate _Aepyornis_. For this species I propose the name of _Aepyornis grandidieri_." The measurements of bones of the hind limb are as follows:-- _Femur._ Length 320 mm. Width at distal end 190 " _Tibio-tarsus._ Length 640 mm. There are at Tring two eggs of this species. No. 1, traded. Length 283.0 mm. Width 215.0 " Large circumference 777.5 " Small circumference 670.0 " No. 2 Ambondo, Ambovombé in the district of Fort Dauphin. Large circumference 775 mm. Small circumference 662.5 " There are recorded of these eggs, besides the two mentioned above, eight further specimens, varying from 810 mm. to 771.5 mm. in large circumference, and 686 mm. to 654 mm. in small circumference. In addition to these there are in various collections about eight or nine eggs whose species is doubtful. {227} AEPYORNIS CURSOR M.-E. & GRAND. _Aepyornis cursor_ Milne-Edwards & Grandidier, C.R. CXVIII, p. 124 (1894). Original description as follows: _Ae. cursor_ is almost as large as _Ae. grandidieri_ = _maximus_ auct., nec. Geoffroy, but is more slender. Length of tarso-metatarsus 380 mm. Width at proximal end 140 " Width at distal end 120 " Circumference of shaft 155 " Width of shaft 65 " Habitat: Madagascar. AEPYORNIS MEDIUS M.-E. & GRAND. _Aepyornis medius_ Milne-Edwards & Grandidier, Ann. Sci. Nat. ser. V, vol. XII, p. 179 (1869). _Aepyornis medius_ Milne-Edwards & Grandidier, Rech. Faune. Orn. Et. Masc. & Mad. (1866-73), p. 97, note 2.