graphical distribution, are, I think, sufficient to constitute distict species. — Length. Proximal Width. Width of Shaft. Distal Width. Metatarsus. D. struthioides 11.5 3.0 1.5 3.8 D. strenuus 11.1 3.4 1.6 4.6 Tibia. D. struthioides 23.0 5.3 1.6 3.0 D. strenuus 22.0 5.3 1.7 3.1 Femur. D. struthioides 11.0 4.0 1.7 4.4 D. strenuus 10.5 3.5 1.7 4.1 At Enfield most of the metatarsi had a length of about 11.75in. (298mm.), but one pair measured only 11.0in. (289mm.), with the shaft as broad as in the larger birds. This small individual may perhaps have been of the opposite sex to the larger individuals; but intermediate sizes were found, both at Hamilton's and Glenmark. The average dimensions of the bones obtained at Enfield will be found in the table at the end of the paper. Anomalopteryx fortis. The bones on which I found this species are three mettarsi, a tibia, and three imperfect femora from Glenmark. The metatarsus has a length from 8.3in. to 7.8in. (208mm. to 198mm.: width at the proximal end, 2.7in. to 2.4in. (68mm. to 61mm.); at the middle of the shaft, 1.5in. (38mm.); and at the distal end, 3.6in. to 3.3in. (91mm. to 84mm.). It is remarkable for the shaft not tapering downwards; for the slight expansion of the proximal end; and for the existence of a considerable depression on the anterior surface of the middle trochlea near its base. The intercondylar ridge is high and the depressions nearly equal in depth; the inner margin of the entocondylar depression is flat and without a median ridge; the hypotarsal ridges (talon) are subequal. The trochleæ resemble those of A. didiformis, but the intertrochlear gorges are still more expanded at the bottom. These metatarsi are easily distinguished from those of Mesopteryx casuarina by the slightly-expanded proximal end, and by the remarkable depression on the anterior face of the middle trochlea. In both these points they resemble the metatarsi of A. didiformis; but in that species the depression is not nearly so well marked and the metatarsi are much smaller.