102 Mr. H. M. Drummond : List of Birds found 
et le corps calleux (corpus callosum). Cet appareil y est réduit 
& ce point, que l’on a pu dire avec quelque vérité 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 4 un développement 
moindre du cerveau. Les hémisphéres sont, avec la masse totale 
de Pencéphale, dans leurs rapports ordinaires, et rien au premier 
aspect ne ferait soupconner 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 été repoussée A tort comme erronée. II ne nie pas Pexistence 
du corps calleux dans les Marsupiaux : il déclare formellement 
qu’on peut voir, si on le veut, dans ce qui reste de la commissure, 
le rudiment d’un corps calleux; mais il reléve avec raison Pab- 
sence dans les Marsupiaux d’un corps calleux comparable a celui 
des autres Mammiféres.”—Loc. cit. pp. 101, 102. 
The interest which you have always shown in the mamtenance 
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 18th, 1845. Ricuarp Owen. 
XI.—List of Birds found in the vicinity of Tunis and Biserta, 
from observations made during a month’s visit from April 21st 
to May 21st 1845. By H. M. Drummonp, 42nd R. H. 
Tue 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. xu. 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; 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- 
