510 Bulletin American Museum of Natural History Vol. LIIT 
mollusks listed for the preceding zone are also found here, perhaps with 
the exception of Limicolaria; but, as they are scattered over a much 
larger area, they are usually more difficult to discover. We believe that 
the faunas of zones (1) and (2) are essentially the same. The species 
listed below and which thus far have been obtained in the mountain 
forest only, will, we think, eventually be found in the ravines and wooded 
patches of the cultivated zone below, and vice-versa. 
Nothapalus celatus Gulella exogonia 
te de-albertisz Thapsia hanningtona 
Bocageia interioris Cerastus trapezoideus 
Ptychotrema limbatum Cexcilioides (?) stuhlmanna 
In the upper half of the mountain forest, bamboos (Arundinaria 
alpina K. Schumann) are mingled with the forest and, as one climbs, the 
dicotyledonous trees gradually become scarcer, while the bamboos are 
more abundant and reach larger dimensions. Between 2,600 m. and 2,800 
m. there is usually, at least on the ridges between the ravines, a distinct, 
dense bamboo belt which has a fauna and flora of its own. Though the 
bamboo belt is occasionally enveloped in clouds, on the whole the environ- 
ment is decidedly drier than in the mountain forest proper. The soil, 
covered with a thick, slippery layer of decaying bamboo-leaves, is more 
exposed to light and bears a scattered and uniform herbaceous vegetation. 
The molluscan fauna is much poorer than in the mountain forest, since 
the following are the only species that have been found there: 
Halolumnohelix zonata Varicostele subvaricosa major 
Homorus castaneus Gulella ovalis 
" mamboiensis var. curcumstriatus  Thapsia hanningtoni 
Bocageia germaint Helixarion subsucculentus 
Bocageia liocephala 
(3) The Supaupine Zons, or region of the Ericacee (Pl. LVIII), 
begins in about 2,800 m. and extends to 3,500 m. It is essentially a zone 
of tree-heaths, Erica aborea Linneus and Philippia Johnstoni (Schwein- 
furth) being the dominant species. There are also scattered representa- 
tives of many other peculiar trees, such as Mesa, Cornus, Hagenia, Myr- 
sine, etc., of a conifer (Podocarpus milanjianus form arborescens Pil- 
ger), and of a tree fern (Alsophila Mildbredii Braun). These low, more or 
less scrubby trees grow amidst a maze of fallen, decaying trunks and 
stumps, densely overgrown with cushions of peat-moss, liverworts, and 
mosses, and the whole ‘s so thoroughly soaked with moisture as to trans- 
formit intoamoor. Various terrestrial ferns and orchids grow between 
