178 TlMEHRI. 
genus, on which Mr. Baker has dealt at some length in 
his report on the plants of the expedition. The genus 
he has called Enterosora [No. 184] ; the species he has 
been good enough to gratify me by naming after my 
friend the late William Hunter Campbell, LL.D. 
— a man who for very many reasons but especially for 
his constant endeavour to forward the scientific interests 
of the colony, deserved so well of the people of Guiana. 
It is perhaps worthy of mention that this plant so 
closely resembles in outward appearance a fern of en- 
tirely different genus {Polypodium trifurcatum L- 
[No 184]) that I collected and dried it in mistake for 
that plant. Were it possible to conceive that this re- 
semblance could be of any benefit to the genus Entoso- 
ra, it might be supposed that its very close resemblance 
to Polypodium trifurcaticm was an instance of ' mimicry.' 
Above the jungle belt comes the bush belt. Here the 
shrubs, much fewer in number, and so scattered over the 
ground as to leave wide intervening spaces, appeared to 
me generally of much the same species as in the lower 
belt. Here, however, as is not the case below, they are 
sufficiently distributed to be individually distinguishable. 
Among them the most prominent are a great number of 
species of Psychotria [Nos. 83, 145, 232, 185], and a 
very remarkable yellow-flowered Melasma [No. 210] M. 
spathaceum, Oliv. N. sp., of which Professor Oliver 
writes that the specimens supplied him are too imperfect 
to afford means of final determination whether this 
should not rather be regarded as the type of a new genus 
outside Melasma; and, in great abundance, a Croton 
(C. surinamense Muell. Arg. aff. [No. 235]). Here too, 
as below, but as is not the case in the jungle belt, occur a 
