160 MR. W. P. PYCRAFT ON THE MORPHOLOGY AND 
Wray [97]; the figure illustrating his paper has been reproduced here by the kind 
permission of the Zoological Society. The pterylosis of the trunk of the embryo has 
been figured by Lindsay [48], and is reproduced here (fig. 3a). 
Apteria :— 
Apt. spinale.—Very narrow, longer relatively than in Caswarius, which it resembles. 
Apt. mesogastrwi.—According to Hildebrand [37] this extends from the beak to the 
cloaca, but judging from Miss Lindsay’s [48] figures it did not extend beyond the 
sternal callosity, as in other flightless Palwognathe. 
Apt. trunci laterale.—This would appear in size and form to closely resemble that 
of Apteryx, and to differ from all the remaining Palwognathe. 
Hildebrand also describes an apterion on the crown of the head. 
Pteryle :— 
Ft. alaris (Pl. XLV. fig. 11).—According to Wray [97] there are 16 metacarpo- 
digitals, distributed as follows:—metacarpals 8; addigital 1; mid-digitals 4; pre- 
* digitals 3. 
According to Wray’s figure, reproduced on Pl. XLY. fig. 11, the primaries are 
placed wide apart and almost at right angles to the long axis of the hand. The 
number of the metacarpals is higher than in any other bird—8. In Rhea and some 
Neognathe, i.e. Flamingo, there are 7 metacarpals. In no other bird, save Struthio, 
are there 4 mid-digitals and 3 pre-digitals. The arrangement of the coverts appears 
to differ materially from that of Rhea. The ala spuria is made up of 4 remiges. 
I await a spirit-specimen before attempting the search for the carpal remex and 
its covert. 
It would be interesting to know whether the flexor carpi ulnaris resembled that of 
Rhea in the large fleshy portion for the attachment of the remiges (fig. 5 a, p. 240) 
and what is the condition of the vinculum tendinee. Assuming that the disposition of 
these parts in Rhea represents a proto-carinate condition, we should expect to find the 
wing of Struthio very similar in these particulars. 
Both pollex and index are armed with a claw. 
Fthamphotheca.—Compound as in Rhea 
Podotheca.—Acropodium and lower portion of acrotarsium with broad transverse 
scutes. Only 3rd and 4th toes are present; of these in the adult only the 3rd bears 
a claw. 
Uropygium wanting. 
