357 
INDEX. 
— ♦ — 
AETHERIA, 151 
,, elliptica, 131. 
Affinities of Aporrhais, 271. 
,, Arachnoidia, 330. 
,, Bathanalia, 266, 270, 347. 
,, Bythoceras, 266, 272. 
,, Chytra, 228, 230, 245, 266, 271, 
2 72 , 277, 349. 
,, ,, kirkii, 228. 
,, halolimnic fauna, the, 351. 
,, Hipponyx, 271. 
,, Jurassic gastropods, the, 351. 
,, Limnotrochus, 266, 271, 330, 
348 . 
,, Lubomirski, 321. 
,, Melania admirabilis, 349. 
,, ,, amarula, 272. 
,, Nassopsis, 230, 267, 269, 271, 
346 . 
,, Oolitic fossils, the, 350. 
,, Onustus, 330, 349. 
,, Opisthobranchs, the, 274. 
,, Paramelania, 266, 272, 336, 
342 , 346 . 
,, ,, damoni, 345, 346. 
,, Planorbis, 276. 
,, Pteroceras, 271, 272. 
,, Purpurina bellona, 345, 346. 
,, ,, inflata, 345, 346. 
,, Purpuroida, 350. 
,, Pyrgulifera, 336. 
,, Rachiglossa, the, 276. 
,, Rhipidoglossa, 277, 345. 
,, Rissoa, 274. 
Affinities of Spekia, 267, 274, 349. 
,, Sponges, the, of Tanganyika, 
3 ° 9 ) 3 I 5 > 321 , 322, 3 2 3 - 
,, Spongilla moorei, 315, 321, 
33 1 - 
,, ,, tanganyikte, 320, 
321, 322. 
,, Strombus, 270, 330. 
,, Taenioglossa, 271, 276. 
,, Tanganyicim, 266, 273. 
,, Tanganyika polyzoan, the, 297 
,, Toxiglossa, the, 276. 
,, Trochus, 272. 
,, Tympanotamus, 343. 
,, Typhobia, 266, 271. 
,, Vivipara, 277. 
,, Xenophera, 270, 349. 
Africa, central, geological characters of, 
354 , 355 - 
,, , geological changes still going on 
in, 107. 
,, , presence of ancient sea in, 68. 
,, shaped like a hog’s back, 39. 
African aqueous deposits, position of, 66. 
,, ,, ,, , extent of, 65. 
,, flora, perplexing nature of, 107. 
,, fresh waters, characters of, 139. 
,, ,, , examination of, 19. 
,, ganoids, 10. 
,, halolimnic fishes, 340. 
,, interior, aqueous deposits in the, 
55 - 
,, ,, , broad conclusions on the 
geological nature of, 69. 
