IS8b. | GEOCOCCYX CALIFORNIANUS. 467 
Cuculus canorus, 
Cacomantis sepulcralis, 
Chrysococcy2 sp., 
Centropus senegalensis, 
Guira piririgua, 
Pheenicophaes sp. 
The same authority finds the accessory femoro-caudal muscle 
present in :— 
Oentropus senegalensis, 
Centropus phasianus, 
Guira piririgua, 
Pheenicophaes sp., 
and absent in the following species :— 
Cuculus canorus, 
Chrysococcy& sp., 
Cacomantis sepulcralis. 
Of this latter peculiarity Mr. Garrod said, “ Amongst the Cuculide, 
the Ground-Cuckoos (Centropus, Guira, Phenicophaes) differ from 
Cuculus and its allies in having the accessory femoro-caudal developed, 
whilst it is absent in the latter, their respective formulz being AB. 
XY., and A. XY. This peculiarity, when added to those in the 
pterylosis, justifies the division of the family into two subfamilies, 
which may be termed the Centropodinz and the Cuculinz ” (oe. cit. 
- 210). 
i According to this author, the ambiens muscle also being present in 
the Cuculidee it throws this group into the subclass named by him 
the Homalogonate ; and Mr. Garrod brings forward his very interest- 
ing researches upon the plantar tendons in birds to still further 
support his classification of this particular group. The arrangement 
of these tendons I will again reter to further on. 
Cuculidee have the czeca also present and possess a nude oil-gland. 
To briefly recapitulate, then, the above and a few other structural 
characters of this group brought to light by this talented investigator, 
we find that the Cuculide are homalogonatous birds with two 
carotids ; with the sciatic artery the main one in the leg (except 
Centropus) ; Ciconine, as regards the presence of the expansor 
secundariorum muscle (see Garrod’s Coll. Scientif. Papers, pp. 323- 
29); and finally, as I say, have a uude oil-gland and the ceca. 
Forbes examined specimens of Geococcyx affinis, and showed some 
interesting points in regard to the bursa Fabricii, which in the Cucu- 
lide he says “presents a very characteristic shape, the peduncle 
being long and thin, and the extremity club-shaped, giving the whole 
somewhat the appearance of a shortened and clumsy antenna of a 
butterfly. It disappears completely in adult birds” (Forbes’s Coll. 
Scientif. Papers, p. 11). This author, on the page of the work 
quoted, presents us with a figure of the cloaca and bursa of Geococcyx 
affinis. 
31* 
