This appears to be the largest species of the genus, though _Ae. maximus_ is considerably stouter. In the original description of _Ae. ingens_, however, the tibio-tarsi referred to that species are really those of _Ae. titan_:-- Smallest Femur. Length about 430 mm. Circumference, narrowest point 280 " Width, distal end 190 " Width of shaft at narrowest part 97 " Largest Femur. Length 470 mm. Circumference at narrowest point 280 " Width, distal end 210 " Distal part of tibio-tarsus. Width at distal end 180 mm. Width of shaft at narrowest point 77 " Circumference of shaft at narrowest point 210 " Tarso-metatarsus. Length 480 mm. Width at proximal end 190 " Width at distal end 165 " Width at narrowest point of shaft 80 " Circumference at narrowest point of shaft 200 " {224} The skull, pelvis, and most vertebrae, as well as the sternum of this form are unknown. Habitat: S. W. Madagascar. Three Femora, two tarsi-metatarsi, and two incomplete tibia-tarsi are in the Tring Museum, collected by Last in the Antinosy country. There are two eggs of this species at Tring, the measurements of which are as follows:-- No. 1, Antinosy Country, Last. Large circumference 862.5 mm. Small circumference 631.5 " No. 2 (traded). Large circumference 883 mm. Small circumference 763 " The egg mentioned by Mr. Lydekker in Cat. Foss. Birds B.M., page 214, No. 41847 is, judging from its size, undoubtedly an egg of this species, and I quote the measurements, as they are very large:-- Largest circumference 921 mm. Smallest circumference 768 " The egg purchased in 1854 in the Paris Museum measures:-- Large circumference 925 mm. Small circumference 753 " In addition to these four eggs which are undoubtedly of _Ae. titan_, there are the following which I consider to belong to that species:-- 1 Paris Museum, Mr. Armange. 1 Hamburg. 1 Messrs. Gilford, Orange, New Jersey. 1 Rowley collection. These four eggs range from 900 mm. to 863.5 mm. in large circumference, and 770 mm. to 736 mm. in small circumference. {225} AEPYORNIS MAXIMUS GEOFF. _Aepyornis maximus_ I. Geoffrey St. Hilaire, Ann. Sci. Nat. sér. 3, vol. XIV, p. 209 (1851). _Aepyornis ingens_ Milne-Edwards & Grandidier, C.R. CXVIII, pp. 122-127 (1894).