24.0 Miscellaneous. 
present anything resembling zoological regions, or centres of creation 
characterized by one or more special types—regions and centres the 
existence of which has been demonstrated for most of the other classes 
of the animal kingdom. 
5. The tendency to the diffusion of the genera and subgenera is 
counterbalanced by the tendency to restriction, which is no less 
distinct, in the species. 
6. The number of species common to two continents, to two 
hemispheres, to the eastern and western seas bounding a continent, 
&e., if not absolutely nz/, is always exceedingly restricted. The 
species of the same genus sometimes change at very small distances. 
The author has not found a single species to be common to the 
French Atlantic coasts and to the shores of the Mediterranean. 
7. Marine currents may explain the rare exceptions to the law of 
the local restriction of species. Thus M. de Quatrefages found at 
Saint Jean-de-Luz the large West Indian Kunice Rousseaui, con- 
founded by Cuvier with the 2. gigantea of the Indian Ocean. This 
species had evidently been conveyed from the West-Indian seas by 
the Gulf-stream. 
8. From the cosmopolitism of the types and the local restriction of 
the species, it is evident that the corresponding geographical terms 
must be sought only among the latter. These are indeed almost 
always found, even in the case of those species which are most 
remarkable for some peculiarity of organization &c. 
9. The class of Annelida, as regards the perfection of the organism, 
does not present the differences in correspondence with the latitude 
which have been indicated in other groups, and especially in the 
Crustacea, by Milne-Edwards. quality of organization is one of 
the most general laws of this group. 
10. The nature of the coast has the most marked influence upon 
the development of the Annelidan fauna. Judging from known 
facts, granitic and schistose coasts are in general remarkably rich in 
species and individuals, whilst calcareous coasts are as remarkably 
poor in both respects.— Comptes Rendus, July 25, 1864, p. 170. 
On a new Species of Turacus. By G. R. Gray. 
A new species of the interesting genus Twracus has just been 
brought by the Rev. C. Livingstone from the Manganja Highlands 
of East Africa, where it was obtained at an elevation of 3000 or 
4000 feet above the sea. 
It approaches the Turacus albocristatus in its general appearance, 
but the crest differs in form, being as it were bicrested; viz. the plumes 
from the crown are long and narrow, thus forming a crest pointed 
posteriorly, while those on the occiput are very short and closely set 
upon it. All the plumes of both parts are tipped with white. The 
rest of the plumage is very similar to that of 7. albocristatus ; but 
the feathers of the back and wings are margined with shining golden 
green instead of bluish green, as is seen on the latter-mentioned species. 
I propose the name of Tuwracus Livingstoni, as a slight acknow- 
ledgment of that gentleman’s merit in adding so interesting a species 
to our knowledge of this showy genus.— Proc. Zool. Soc. Feb. 9, 1864. 
