36 
one in Pezophaps, state, “This process is now regarded’ as the head of the third 
(anchylosed) metatarsal,” and quote Gegenbaur as their authority. I must, how- 
ever, enter my dissent from that view. The process, as its name implies, is only a part 
of the head of the third or mid metatarsal. The portion of the head in advance of the 
origin of the process is wedged between the heads of the second and fourth meta- 
tarsals, and in a greater degree in Dinornis (tom. cit. pl. 28. figs. 4 & 7) than in 
Struthio (ib. fig. 2). 
In a subsequent Memoir (July 14, 1846) the upper and hinder outstanding process 
of the middle element of the compound bone is termed “ calcaneal”, in reference to 
its functional analogy to the calcaneal fulcrum in Mammals, not to indicate homology, 
as Professor Gegenbaur appears to have believed. The metatarsal element to which 
any tarsal homology might be applicable is expressly limited to the one affording 
articular cavities to the tibial trochlez, and “‘ which seems to represent a proximal 
epiphysis ”*. 
To the three principal elements of the shaft the following names and symbols were 
applied*:—“ ‘ entometatarse’ (11), ‘mesometatarse’ (11), ‘ectometatarse’ (1v)”—the 
numerals referring to the toes in the type or pentadactyle foot, which the three meta- 
tarsus elements respectively bore. 
The “ calcaneal process” is not the “head” of the mesometatarse (111), but, as the 
name rightly implies, is a process from the upper and back part of that element, con- 
joined with a corresponding projection from the part of the common epiphysis covering 
the mesometatarsal. 
DESCRIPTION OF THE PLATES. 
PLATE I. 
Side view of the skeleton of the Dodo (Didus ineptus, Linn.), articulated and displayed 
in the Ornithological Gallery of the British Museum. 
PLATE II. 
Oblique back view of the same skeleton. 
Both these Plates are taken from photographs, corrected, as to perspective and 
better indication of details, from the subject. The lithographs are reduced to 4 the 
natural size. 
' “Of. Gegenbaur, Arch. fiir Anat. und Physiol, 1863, pp. 450-472; Untersuchungen zur yergleichenden 
Anatomie der Wirbelthiere (4to, Leipzig, 1864), pp. 93-108, pl 6.” 
* “The posterior surface of the calcaneal process is broad, triangular, vertically grooved, and perforated at 
its base” (Trans. Zool, Soc. iv. p. 52), 
* Trans, Zool. Soc. vol, iii. p. 243 (1848); and, in the present work, see p. 229, pl. 58 (metatarsus of 
immature Dinornis crassus and D. elephantopus). * Trans. Zool. Soc. vol. iy. p.8 (1850) 
