DR. T. ANDERSON ON AFRICAN ACANTHACE X. 13 
mission, and reached the Cameroon river at 3 a.m. on the follow- 
ing morning, intending to return to Fernando Po by the next 
steamer. 
I owe many thanks to Mr. and Mrs. Saker and Mr. Smith, who 
here, and especially in Victoria, have always assisted me with the 
greatest kindness and politeness, thus removing many of the 
disagreeables connected with the expedition. 
In the trust that the result of this expedition may meet your 
approval, and that the flora of the mountains of west tropical 
Africa may thereby become known to science, 
I have the honour to remain, &c., &c., &c., 
G. Mann. 
Cameroons, February 27, 1862. 
An Enumeration of the Species of Acanthacee from the Continent 
of Africa and the adjacent Islands. By Tuomas ANDERSON, 
M.D., F.L.S., Officiating Superintendent of the Royal Botanic 
Gardens, Calcutta. 
[Read June 5, 1862. ] 
In this enumeration, I have followed the classification I proposed 
in my monograph of the Cingalese species of Acanthacem, pub- 
lished in Thwaites’s ‘Enumeratio Plantarum Zeylanie.’ The 
principal feature of that arrangement is the subdivision of the 
Order into two great Suborders, Ruellidee and Acanthidee, distin- 
guished from each other by the character of the zestivation of the 
corolline lobes, and into a third small but well-marked group, 
separated from the other two by the nature of the calyx, and also 
by the peculiar placental processes of the seeds. I shall reserve 
some remarks on the limits of the genera and the geographical 
distribution of the African species for the general revision of the 
Order, which I hope to submit to the Society at an early date. 
CONSPECTUS GENERU M. 
Subordo I. THUNBERGIDE*. 
Calyx ad annulum carnosum, integrum vel pluridentatum reductus. 
Corolle lobi estivatione contorti. Semina cupula suffulta.— 
Plante volubiles, raro prostrate. 
1. THUNBERGIA. Calyx. inconspicuus, bracteis duabus magnis 
occultus. 
