Bibliographical Notices. 47 



nura and Pleroptochos. The bones forming the pelvis ap- 

 proach very nearly in form and disposition to those of Menura, 

 differing in no particular except in their smaller size. The 

 sternum is broader in proportion to its length than in that 

 genus, and agrees in the # form of its posterior margin with the 

 Thrushes and Shrikes, generally not having the portion be- 

 tween the lateral fissures produced as in Menura. The os 

 furcatum agrees with the last-named genus in having the 

 rami rounded, and in being destitute of a process at the ex- 

 tremity approaching the sternum ; but in having the rami 

 bent laterally inwards near the middle, so as to approach 

 each other, it agrees with the Shrikes and Thrushes. 



Not having been able to obtain a specimen of the South 

 American genus Thamnophilus to dissect, it is of course 

 merely conjecture, when I state that I believe the anatomy of 

 that genus will be found to approach very nearly to that of 

 Psophodes ; referring to the external characters, although the 

 bill differs much in form, the nature of the plumage and the 

 form of the tail and wings are very similar. 



Craticus Tibicen, Vieill. 

 Trachea, muscles of voice, tongue, and oesophagus as among the 

 Corvid<e generally. Intestinal canal of moderate length ; caeca scarcely 

 more than rudimentary ; cloaca large ; gizzard of moderate size, 

 oval, flattened, muscular, interior surface (epithelium) hardened, 

 transversely rugose, filled with the remains of insects. 



Length of oesophagus 4 inches. 



Length of rectum ^ „ 



Length of intestine 20 „ 



Length of caeca £ ,, 



The skeleton of Craticus Tibicen, like the soft portions, does 

 not differ materially from the general structure found among 

 the Corvidce ; the scapula, however, is rather broader near t\(fj 

 hinder extremity than in the middle, and the sternum pro- 

 portion ably larger than in any other Corvidm with which I 

 have had an opportunity of comparing it. The number of 

 the vertebrae are 

 Cer. 12 ; Dor. 8 ; Sac. 12 ; Caud. 8; Ribs 8, 5 true, 3 false. 



BIBLIOGRAPHICAL NOTICES. 



Wiegmann's Archiv fur Naturgeschichte. Seventh Year. Parti. 

 1841. Berlin. 



We have already apprised our readers of the intended continuation 

 of this valuable journal, (established and so ably conducted by our 

 friend the late Prof. A. Wiegmann of Berlin,) under the superintend- 

 ence of Dr. Erichson, in conjunction with Dr. Grisebach in Gottingen, 



