224 Natural History of the Family Cuculidce. 
Series of the Series of the Series of the Series of the Series of the 
Cuculidce. Insessores. Class Aves. Class Mammalia. Ungulata. 
Cuculinae Conirostres Insessores Quadrumana Ruminantes 
Coccyzinae Dentirostres Raptores Ferae Solipedes 
Saurotherinse Fissirostres Natatores Cetacea Anaplotheres 
Tenuirostres Grallatores Glires Edentates 
Indicatorinae Scansores Rasores Ungulata Pachydermes 
It is not absolutely essential for the verification of an ornithologi- 
cal circle that its contents should be compared with those of other 
circles in a different class of the animal kingdom, yet where doubts 
may be reasonably entertained on one of the types, as in the pre- 
sent instance, it is highly expedient that the other four should un- 
dergo a very extensive comparison, and for this reason the reader will 
not fail to perceive that they are here submitted to a very searching 
and severe test, a test, in fact, which sooner or later they must 
undergo, or be rejected. Another reason, also, for introducing 
them in this place, is to call the zoologist's attention to the last set 
of analogies, or that which belongs to the Indicatores. By this we 
find that the attachment to man, and wonderful sagacity of the honey- 
guides, are represented by the parrot in the first column, the gal- 
linaceous birds in the second, the ruminating animals in the third, 
and the elephant in the fourth, each being in its own series pre- 
eminently distinguished for social qualities. Further, I may ob- 
serve, that this extraordinary property of the rasorial type can be 
traced through all those groups among the Annulosa, which I have 
as yet investigated ; but, as this would involve us in an endless field 
of inquiry and demonstration, the subject cannot be pursued. 
There is, nevertheless, one analogy between the Cuculidce and the 
Annulosa, which must be touched upon ; since we should otherwise 
leave unexplained the most remarkable peculiarity attached to this 
family of birds : this, as before intimated, is in the parasitic nature 
of the typical cuckoos. We search in vain for analogous examples 
of this habit among these quadrupeds now existing, but on looking 
to the sub-kingdom Annulosa, and investigating the two typical 
classes of insects, (the Aptera and Ptilota,) we find that the follow- 
ing groups are all the most aberrant of their respective circles ; and 
as this is the precise station of the cuckoos in the circle of the Scan- 
sores, it consequently follows, that they are all mutual representa- 
tives of each other. 
Cuculus. Vermes, (pars) Lin. Pediculus. Acarus. Sty lops. 
Cynips, L. Chrysis, L. Nearly the whole of the insects compos- 
ing these groups, as every entomologist knows, are eminently pa- 
rasitic ; and, according to my researches, they actually occupy in 
