103 Mr. H. M. Drummond : List of Birds found 



et le corps calleux (corpus callosum). Get appareil y est reduit 

 k ce point, que Pon a pu dire avec quelque verite que le corps 

 calleux n^existe pas." The editors then give a detailed account 

 of a dissection of the brain of a kangaroo, confirmatory in all re- 

 spects of my own, and they rightly remark : " Cette disparition 

 presque totale du corps calleux ne se lie pas k un developpement 

 moindre du cerveau. Les hemispheres sont, avec la masse totale 

 de Pencephale, dans leurs rapports ordinaires, et rien au premier 

 aspect ne ferait soup9onner la disposition de la voute." They add, 

 probably in reference to Prof. Mayer's statement : " L'observa- 

 tion de M. Owen sur cette disposition du cerveau des Marsupiaux 

 a ete repoussee k tort comme erronee. II ne nie pas Fexistence 

 du corps calleux dans les Marsupiaux : il declare formellement 

 qu'on pent voir, si on le veut, dans ce qui reste de la commissure, 

 le rudiment d'un corps calleux ; mais il releve avec raison Fab- 

 sence dans les Marsupiaux d'un corps calleux comparable k celui 

 des autres Mammiferes." — Loc. cit. pp. 101, 102. 



The interest which you have always shown in the maintenance 

 as well as the discovery of truths in natural history, has induced 

 me to beg permission to trespass thus far on your valuable space. 

 I have the honour to be. Gentlemen, 



Your obedient servant, 

 London, July I8th, 1845. RlCHARD OwEN. 



XI. — List of Birds found in the vicinity of Tunis and Biserta, 

 from observations made during a month's visit from April 2\st 

 to May 2lst 1845. By H. M. Drummond, 42nd R. H. 



The following list of a few of the birds frequenting the N. coast 

 of Africa, as well as a former one of the birds of Crete (vide Ann. 

 Nat. Hist. vol. xii. p. 423), I have been enabled to draw up 

 through the kindness of Capt. Graves, H.M.S. Beacon, in in- 

 viting me to accompany him to the above-mentioned places, to 

 whom also I am greatly indebted for the facilities he afforded me 

 in accompanying the boats on an expedition up the lakes of 

 Biserta. This list however is necessarily imperfect, owing to the 

 shortness of my visit, as well as from the passage of the migra- 

 tory birds being nearly terminated at the time of my arrival. 

 The whole of these birds are found in the vicinity of the Biserta 

 lakes, with the exception of the Pterocles arenarius, P. setarius, 

 and Otis houbara. 



The lakes of Biserta are about 40 miles to the westward of 

 Tunis j it was said that they are much more extensive than is 

 really the case, and also that a communication for shipping could 

 easily be opened, rendering the lower lake one of the finest har- 



