660 



FURTHER OBSERVATIONS UPON THE ANATOMY 

 OF THE INTEGUMENTARY STRUCTURES IN THE 

 MUZZLE OF ORNITHORHYNCIIiT:^. 



By J. T. WiLsox, M.B., Professor of Anatomy, and C. J. 



Martin, M.B., B.Sc, Demonstrator of Physiology, 



IN THE University of Sydney. 



(Plates xlvi.-xlviii.) 



In a recent paper in the Quarterly Journal of Microscopical 

 Science,* Professor E. B. Poulton has recurred to the subject of 

 the tactile and glandular structures in the skin of the snout of 

 the Ornithurhynchus, and has given in addition an interesting 

 account of the structure, and in part of the development, of the 

 hairs in the same animal, with which account he has incorporated 

 a discussion of the homologies and origin of mammalian hair in 

 general. 



It is with the earlier part of the paper, dealing with the 

 structures in the skin of the snout, that the present writers 

 are more particularly concerned. Mr. Poulton has done us 

 the honour of making frequent reference to our previously 

 pul:)lished observations! upon the rod-like tactile organs (push- 

 rods), of whose existence and genei'al structural characters he was 

 the first to give a description. | 



We are interested to note that part of Mr. Poulton's later work 

 on the peculiar structures in question had been carried on con- 

 temporaneously with our own — viz., in the (English) summer of 

 1892. The abstract of our long-delayed paper in the Macleay 

 Memorial Volume appeared in the published " Abstract of Pro- 

 ceedings of the Linnean Society of N.S.W.," August 31st, 1892, 



* Vol. XXXVI. p. 143. 



t Macleay Memorial Vol. Sydney, 1892, p. 190. 



:J:Proc. Physiol. Soc. pp. xv. and xvi. ; Journ. of Physiol. 1884. 



