Dr. M. Coughtrey on the Tracheal Pouch of the Emu. 217 



4. Sexradiate spicules. 



a. With the rays simple, elongate, attenuated, smooth 



or spinulose. 



b. Rays cylindrical, blunt, rugose at the end. 



c. Rays short, thick, entirely rugose or spinulose. 



d. Rays attenuated, with side rays. 



e~ Rays enlarged at the end, simple or torn. 



f. Rays divided into elongated simple branches at the 



end. 



g. Axis elongate, ending in short recurved rays at the 



end used for anchoring. 

 h. Axis and rays ending in 4 or 8 recurved lobes. 



5. Multiradiate spicules. Rays tapering or cylindrical, 



smooth or tubercular. 



6. Spicular spherules. Orbicular or oblong, smooth or tu- 



bercular. 



7. Birotulate spicules. 



XXVIII. — Note respecting the Tracheal Pouch of the Emu. 

 By Millen Coughtrey, M.B., Demonstrator of Anatomy, 

 Liverpool Royal Infirmary School of Medicine. (Com- 

 municated by Dr. J. Murie, Professor of Anatomy, Royal 

 Veterinary College, Edinburgh.) 



[Among other items of intelligence from my friend Dr. 

 Coughtrey is one relative to some points in the anatomy of 

 an Emu {Dromozus novce-hollandiw } Vieill.) examined by him. 

 He mentions having found a hitherto unnoticed valve guarding 

 the orifice of the right precaval vein, a detailed account of 

 which he intends shortly to publish. As regards a probably 

 similar structure in the ostrich (Struthio camelus), I have 

 called his attention to Professor Macalister's paper on the 

 anatomy of this bird (Proc. R. I. A. 1864, p. 541). _ Dr. 

 Coughtrey's observations on the tracheal pouch I subjoin in 

 abstract, his further minutiae forming a separate communication 

 to the Literary and Philosophical Society of Liverpool. As 

 his researches partially corroborate and partially differ from 

 my own, I have thought a short notice might appropriately be 

 inserted in the 'Annals.' Dr. Coughtrey says :] 



In a specimen of this creature which I had the opportunity 

 of dissecting on the 8th of March last I found the tracheal 

 pouch, which is a marked character of the Emu as distinguished 

 from other Struthious birds. The sac in question has already 



