INDEX. 
3 6 3 
Geological types, Huxley’s discourse on, 
352. 
,, views, the older, 32. 
,, nature of the African interior, 
broad conclusions on, 69. 
Geology of the Congo, 355. 
,, ,, Rusisi valley, 82. 
,, ,, Shirwa district, 57. 
,, ,, Southern section of the 
African interior, 56. 
Gephyrochromis moorii, description of, 
196. 
Gnathonemus stanleyamus, 128. 
Gotzen, explorations of, 79. 
Grammatoria lemairii, description of, 191. 
Great African Central range, 34. 
,, ,, , elevation and de- 
pression in, 35. 
,, ,, , examination of, 40. 
,, „ , extent of, 33, 
,, ,, , formation of, 68. 
,, ,, , upthrust in, 39, 98, 
iox. 
,, ,, , volcanoes in rela- 
tion to, 36. 
Gregory, explorations of, 34. 
Haplochilus johnstoni, 124. 
Hemitilapia oxyrhynchus, 124. 
Herbst, experiments of, 28. 
Hipponyx, affinities of, 271. 
History of the continent, 8. 
Hog’s back, geological form of the con- 
tinent, 39. 
Huxley’s discourse on geological types, 
351- 
Hypotheses, various, to account for the 
halolimnic fauna, 336, 
Hydrocyon forskalii, 132. 
,, lineatus, 128, 154. 
INVESTIGATIONS OF SEMPER 
AND SOLLAS, 12. 
Isidora coulboisi of Tanganyika, 217. 
,, forskali, 131. 
,, nyassana, 125. 
,, strigosa, 131. 
,, succineoides, 125. 
,, transversalis, 131. 
,, trigona, 131. 
Island floras compared to lake faunas, 147- 
151- 
Islands, probable group of ancient, 68. 
HALOLIMNIC FAUNA, 9, 141, 143, 
327, 328, 329. 
,, ,, , affinities of, 351, 352. 
,, ,, , ancestral type of, 341. 
,, , , , distinctive characters 
of, 334- 
,, ,, , evidence concerning 
the, 353, 354. 
,, ,, , hypotheses to account 
for, 336. 
,, „ , marine origin of, 337, 
339, 343- 
,, , meaning of its pecu- 
liarities, 331. 
,, , primitive characters of 
the, 330. 
,, , Tanganyika of, 139, 
140, 141, 150. 
fishes of Africa, 340. 
gastropods, nature of, 266. 
JELLY-FISH OF TANGANYIKA, 133, 
141, 287. 
,, ,, , description of, 
298. 
,, ,, , life history of, 
301, 305. 
,, ,, , native descrip- 
tion of, a, 
302. 
,, ,, reported in the 
Congo, 140. 
Jolly, conclusions of, 26. 
Jordan, the valley of, a eurycolpic fold, 40. 
Julidochromis ornatus, description of, 176. 
Jurassic fauna of Tanganyika, 74. 
,, gastropods, affinities of, 351. 
,, parallels among the gastropods of 
Tanganyika, 349. 
,, shell Amberleya, 346. 
