INDEX. 
367 
Park-lands, England and Europe, the, of, 
no. 
,, , Euphorbias, the part played 
by, in the formation of, 115, 
1 17- 
,, , explanation of their formation, 
1 14, JI 5> ll 7 - 
,, , expression of physical change, 
the, 1 1 7. 
,, > geographical position, 108, 
109. 
,, , Nyassa Tanganyika, the, of, 
108. 
,, , puzzle to all explorers, a, 108, 
109, no. 
Pelotrophus microcephalus, 124. 
,, microlepis, 124. 
Pemba, coal of, 66. 
Perissodus microlepis, description of, 212. 
Persistence of ancient forms, 6. 
Petrochromis andersonii, 129. 
,, nyassae, 124. 
,, polylepis, description of, 1 86 t 
,, polyodon, ,, , 208. 
,, tanganicte, ,, ,210. 
Pholides, apparent borings of, 84. 
Physical change, importance of, in zoo- 
logy, 28. 
,, features of Central Africa, 9. 
Physopsis africana, 125, 21 7. 
, , ovoidia, 1 3 1 . 
,, tanganyicse, 217. 
Planorbis, 16, 18, 125, 129. 
,, , affinities of, 276. 
,, adowensis, 129. 
,, apertus, 129. 
,, choanomphalus, 131. 
,, sudanicus, 130, 131, 217. 
,, victorise, 131. 
Plateau of Tanganyika, 80. 
Platythelphusa armata, 279. 
,, ,, , description of, 280, 
286. 
Plains, alluvial, south of Albert Edward 
Nyanza, 86. 
Plecodus paradoxus, description of, 212. 
Pleurotomaria, affinities of, 272. 
Pleistocenes, African lake, 65. 
Polypteridae, 135. 
,, , distribution of, 341. 
,, in Tanganyika, description 
of, 154. 
Polypterus, 330. 
,, belongs to the halolimnic 
group, 340. 
,, congicus, 154. 
,, in Lake Rudolf, 132. 
,, senegalus, 132. 
Polyzoa, 1 31. 
,, arachnoidia, affinities of, 330. 
,, , Tanganyika, of, 141. 
,, , Victoria Nyanza, of, 131. 
Polyzoon of Tanganyika, description of, 
295- 
Post pleistocene activity round Nyassa, 63. 
Potamolepis found in the Congo, 342. 
,, weltneri, description of, 323. 
Prawns in Lago di Garda, 15. 
,, of Tanganyika, 142, 279, 330. 
Primary fresh-water fauna, 15, 16, 30. 
Prosobranchiata, 16, 276. 
Protopterus uethiopicus, 130, 131, 154. 
,, annectens, 131. 
Protozoa of Tanganyika, 138, 323. 
Purpurina bellona, affinities of, 345. 
„ inflata, „ , 345, 346. 
,, ,, of the marine oolite, 346. 
Purpuroidia, affinities of, 350. 
QUARTZITES ABOUT TANGANY- 
IK A, 48. 
RACHIGLOSSA, 276. 
Red Sea, 35. 
,, in a eurycolpic fold, 40, 132. 
,, , volcanoes in floor of, 45. 
Rhipidoglossa, affinities of, 271, 276, 277, 
345- 
Ridge of the great central chain, double 
cusped, 45. 
Risson, affinities of, 274. 
Rivers of Africa, their fauna, 139. 
,, ,, , recent changes in, 80. 
