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 Gouiopltyllum jjyramidale,''' and it is also shown 

 in Bayle's figure of Rhizophylhuii gerviUei,j on the ventral face, 

 although in this instance the epitheca 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- 

 ])hyllum,% separating the corallum in that genus into four portions. 

 Both in R. australe and R. iuterpuiictatum, when epithecate, the 

 above incisions, as previously mentioned, are replaced by a faint 

 angulation or ridging of the sux'face, but this does not approach 

 anything like the definite rib seen on Lindstrom's beautiful figure 

 of RJiizoijliyllum (/othla'i/dicum.^ 



NOTES ON THE STRUCTURE OF PEDIONOMUS 



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. 



Thp: Trustees of the Australian Museum have, besides many other 

 valuable birds forwarded through the Curator, Dr. Ramsay, to 

 the Cambi'idge Museum of Zoology, sent two well preserved spirit 

 specimens oiFedionomus t07'qi(,atus, 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. Vet. Akad. Handl. Stockholm, 1882, vii. No. 4, 

 t. 5, f.l. 



t Expl. Carte Geol. France, 1878, iv. Atlaa, t. 17, f. 13. 

 X Geol. Mag., 1866, iii. p. 358. 



* Bihang K. Vet. Akad. Handl. Stockholm, 1882, vii. No. 4, t. 3, f. 4. 



