440 MR. H. ADAMS ON SHELLS FROM EASTERN PERU. [Nov. 22, 



I am positive the bird kept in the same place ; and yet its mimicking 

 voices were heard in different places." 



In a former note from Mr.T.MacGillivray, that gentleman remarks, 

 " They were both noisy enough, mimicking Sericornis citreogularis 

 and several other brush-birds, besides having a note peculiarly their 

 own. Both were males." 



This is a great source of regret, as neither did the late Mr. Gilbert, 

 nor Mr. G. Masters during his recent trip to Western Australia, pro- 

 cure the other sex of A. clamosa ; so we are still in the dark as to 

 the females of either species. But now that we have an Atrichia 

 inhabiting a district so near Sydney I hope we shall not long remain 

 in ignorance upon this point. 



The same wonderful power of ventriloquism noted above shows 

 itself also in Atrichia clamosa. Mr. Masters informs me that he 

 was greatly perplexed in searching for this species in Western Aus- 

 tralia, where it inhabits dense masses of vegetation consisting of tall 

 reedy grass and thick-growing low busby shrubs. A whole morn- 

 ing was spent without a single glimpse of the bird, although its note 

 was frequently heard within a few feet of where he was standing, 

 first seeming to come from one side, then from another, then sound- 

 ing loud and clear a few feet in front. 



Upon another occasion, while passing a thicket of reeds, grass, and 

 scrub, Mr. Masters observed one run in and disappear in a moment, 

 without giving him a chance of bringing his gun to bear on it. As it 

 was useless, even if possible, to follow it, he lay clown at a short 

 distance from the edge and determined to wait until the bird reap- 

 peared ; after a considerable time he was rewarded by seeing its head 

 poke out ; and after looking round to see if the coast was clear, the 

 bird came out and commenced to scratch in the sand, giving him an 

 opportunity which was not lost. 



Ventriloquism is not confined to the Atrichias. I have myself 

 been sorely at a loss to find Oreoica gutturalis. I have also ob- 

 served ventriloquism in the Cincloramphi, as well as in Ptenoedus 

 rufescens. 



9. List of Land and Freshwater Shells collected by Mr. E. 

 Bartlett on the Upper Amazons, and on the River Uca- 

 yali, Eastern Peru, with Descriptions of New Species. 

 By Henry Adams, F.L.S. 



(Plate XXXVIII.) 



Fam. AmpullariidjE. 



1 . Pomus yatest, Reeve. 



2. Pomus nobilis, Reeve. 



3. Pomus amazonicus, Reeve. 



