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SUPPLEMENTAL NOTE ON THE OSTEOLOGY OF 
NOTORYCTES TYPHLOPS. 
By E. C. Stiruine, M.D., F.R.S., Hon. Director South 
Australian Museum. 
Prare 1. 
In the course of an examination of the muscular system of 
Yotoryctes typhlops Professor Wilson has been good enough to 
point out an error into which I have fallen in my description of 
the osteology of the manus (Trans. Royal Soc. of 8.A., vol. XTV., 
part I.) in consequence of a small but important bone having 
been lost in the preparation or manipulation of the dry skeleton 
on which my observations were based. I take the opportunity 
of the publication of the first part of his paper on the “ Myology 
of Votoryctes” as convenient for the correction of the error. 
In the account referred to (p. 176, and Plate viii, fig. 5) I 
describe the pollex as consisting of two segments only, of which 
the proximal is attached by ligamentous connections to the meta- 
carpal of the second digit as well as to the proximal phalanx of 
the latter. Being desirous of not mutilating other specimens, 
then as even now rare, I abstained from substantiating the 
existence of this obviously peculiar arrangement by reference to 
other dissections, but an examination of Professor Wilson’s 
specimen as well as of another in which the bony relations have 
been left undisturbed leaves no doubt but that an additional carpal 
bone exists of which, for the reason stated, I made no mention. 
In the light of this re-examination, it appears that the proxi- 
mal element of the pollex is a small nodular bone about the size 
of a large pin’s head, which articulates with the relatively large 
scapho-carpal. It is this bone, clearly a trapezium, which was 
missing in my original dry specimen (pl. i. figs. 1 and 2 @7). 
Allowing for the existence of this important element, an inspec- 
tion of Prof. Wilson’s specimen requires a further emendation 
of the constitution of the remainder of this digit as stated by 
me. Examination of his specimen shows that the proximal of 
the two segments which, by themselves in my description, consti- 
tuted the pollex, shows a division into two parts—one an elon- 
gated bone articulating with the trapezium (pl. 1. fig. 1, meé. 1), 
the distal shorter and bearing a well-marked process radially 
directed (pl. i, fig. 1, ph. prow.). Even in Professor Wilson’s 
specimen the division between these two bones is indistinct, and 
on referring to my own specimen I can find no trace of such 
separation, the two bones being fused into a simple segment. 
The radial process, however, on the distal element is clearly 
shown in my sketch. Lastly follows the ungual phalanx, which 
is less clearly shown to be a separate bone in Professor Wilson’s 
specimen than in mine own. If, then, as seems clear, we are to 
