205 
that along a line answering to the position of the cardinal septum, 
the corallum is split, and the ends of these layers are turned or 
tucked inwards, towards the interior of the visceral chamber. In 
another example there is a similar incision on the ventral face, 
answering to the counter septum, thus separating the corallum as 
it were into two triangular halves. A similar division is some- 
times visible in Goniophyllum pyramidale ,* * and it is also shown 
in Bayle’s figure of Rhizophyllum yervillei, f on the ventral face, 
although in this instance the epi theca seems to be preserved. On 
the other hand I have failed to detect any division along the 
lateral angles as described by Lindstrom in the calice of Gonio- 
phyllum, | separating the corallum in that genus into four portions. 
Both in R. australe and R. interpunctatum , when epithecate, the 
above incisions, as previously mentioned, are replaced by a faint 
angulation or ridging of the surface, but this does not approach 
anything like the definite rib seen on Lindstrom’s beautiful figure 
of Rhizophyllum gothlcmdicu?n.§ 
NOTES ON THE STRUCTURE OF PED10N0MUS 
TORQUATUS , WITH REGARD TO ITS SYSTEMATIC 
POSITION. 
By Hans Gadow, Ph. D., M.A., 
Strickland Curator and Lecturer on the advanced Morphology of 
Vertebrata in the University of Cambridge. 
The Trustees of the Australian Museum have, besides many other 
valuable birds forwarded through the Curator, Dr. Ramsay, to 
the Cambridge Museum of Zoology, sent two well preserved spirit 
specimens oiPedionomus torqnatus, and Dr. Ramsay has more than 
once expressed the wish that I should determine the affinities of 
this peculiar bird. Although I have much pleasure in making 
the following communication, I do so with some reluctance, 
because of the incomplete state of my investigations. Two intact 
specimens of Pedionomus would be of course sufficient for an 
extensive and amply illustrated monograph, if such were desirable, 
* Lindstrom, Bihang K. Yet. Akad. Handl. Stockholm, 1882, vii. No. 4, 
t. 5, f. 1. 
f Expl. Carte Geol. France, 1878, iv. Atlas, t. 17, f. 13. 
I Geol. Mag., 1866, iii. p. 358. 
* Bihang K. Yet. Akad. Handl. Stockholm, 1882, vii. No. 4, t. 3, f. 4. 
