Zoological Society. 377 
the first being very small and conical; the third are subtriangular, 
with a slight tubercle on the inner side : ; the orbit not quite com- 
plete, but ‘with a short interr uption in the middle of the hinder side. 
Length of skull 2,45 inches, width +} ; length of palate 1,4 inch ; 
of face from front of orbit 53 lines; of lower j jaw 1 inch 33 ‘lines. 
5. DESCRIPTION OF A NEW SPECIES OF CINCLOSOMA. 
By J. Goutp, Esa., F.R.S. Erc. 
CINCLOSOMA CASTANEOTHORAX, D. Sp. 
Sp. Ch.—Crown of the head, ear-coverts, back of the neck and 
upper tail-coverts brown; stripe over the eye and another from the 
base of the lower mandible, down the side of the neck, white ; shoul- 
ders and wing-coverts black, each feather with a spot of white at the 
tip; all the upper surface, the outer margins of the scapularies, and 
a broad longitudinal stripe on their inner webs next the shaft, deep 
rust-red ; primaries, secondaries, and the central portion of the sca- 
pularies dark brown; tail black, all but the two central feathers 
largely tipped with white; chin and throat black; chest crossed by 
a band of rich rust-red; sides of the chest and flanks brownish grey, 
the latter blotched with black; centre of the abdomen white ; under 
tail-coverts brown, deepening into black near the tip, and margined 
with white; bill and feet black. 
Total length, 84 inches; bill, 1; wing, 4; tail, 43; tars, 1. 
Hab. Darling Downs, New South Wales. 
Remark. -—Nearly allied to C. castanotus and C. cinnamomeum, from 
which it is however ay distinguished by the colour of the chest 
and back. 
Dr. Macdonald communicated orally his ideas on the Vertebral 
Homologies as applicable to Zoology, of which observations he has 
furnished the following abstract :— 
** Dr. Macdonald gave a short sketch of the characters of the typical 
vertebra, as proposed by Professor Owen and several continental 
zoologists and comparative anatomists, and then contrasted it with 
one which had been the result of many years’ study, and which he 
considered more in accordance with the vertebra and its auto- 
genous and exogenous elements as traceable in the endoskeleton of 
the Vertebrate classes, and also as showing its analogy in the Annu- 
lose animals. ‘The table which he exhibited points out these, from 
which it would appear that Dr. Macdonald considers the bodies of 
the vertebre, as described by anthropotomists,—continued downwards 
through the sacrum and coccyx to the top of the tail, and the basilar 
process upwards to the sella turcica,—as so many portions or segments 
of a central axis formed around a centrochord,—and not a notochord 
as usually described,—from which the autogenous elements spring 
and radiate to the periphery, and, converging mesially along the dorsal 
aspect, enclose within the tunnel of the Neuro-Camera the whole 
cerebro-spinal axis, of varying dimensions in the different regions, 
and another set of radii meeting sternally, and forming the three 
