654 
Truncatella, 241. 
teretiuscula, Nodularia, 386. 
teretiusculus, Unio, 382, 386, 576. 
Unio, 400. 
tessellaia, Melania, 269. 
tetragonostoma, Planorbis, 118. 
texistriatum, Ceras, 602. 
Thais, 54, 563, 564, 565. 
Thalassinidea, 44. 
Thapsia, 490, 492, 493, 499, 503, 506, 
509, 510, 513, 515, 602. 
thaumasta, Nyassia, 256. 
Thecosoma, 91. 
Thelephoride, 470. . 
Themeda, 502. 
Theodorus, 165. 
Theodoxia, 165. 
Theodoxis, 164. 
Theodoxus, 157, 168, 164, 522. 
thermale, Pisidium casertanum var., 522. 
thermalis, Lymnza peregra var., 521. 
thermarum, Bythinella, 521, 522. 
thermophila, Neritina, 521. 
Thiara, 250. 
Thiaridz, 89, 248, 299. 
tholloni, Mutelina, 431. . 
thomasi, Opeas, 601. 
Thomea, 482... 
Thomeonanina, 482. 
thomsoni, Grandidieria, 399, 588. 
Limnotrochus, .299 (Fig. 56a), 318 
(Fig. 65a—b),.589, 591. 
Unio, 399. 
thottont, Mutelina, 481. 
Thryophorella, 482. 
Thryophorellidz, 482. 
thysvillense, Pseudopeas, 499. 
Ptychotrema bequaerti, 499. 
thysvillensis, Curvella, 499. 
Subulina, 499. 
Tiara, 251, 265. 
tiarella, Edgaria, 333, 590. 
Nassopsis, 332. 
Paramelania, 333. 
Tiaride, 249. 
tigrina, Galateia bengoensis var., 360. 
tilhoi, Bulimus, 216. 
Bythinia, 216. 
INDEX 
Planorbis, 125. 
Valvata, 243. 
timida, Edgaria, 335. 
Paramelania, 335. . 
Tiphobia, 70, 299, 300, 301, 316, 318, 
320, 321, 583, 589, 590, 591, 592, 
593. 
Tiphobia, 324, 326, 380, 331. 
Tiphobiide, 299, 590. 
togoénsis, Caridina, 1, 3, 7, 8, 11, 13, 
14 (Figs. 1-28), 15, 16 (Figs. 29- 
62), 17, 18, 19, 64. 
tomentosa, Erythrina, 508. 
Tomichia, 225, 484. 
tornata, Melama, 288. 
Potadoma, 275, 276, 283 (Fig. 48), 
286, 288, 569. 
Tornatellina, 103. 
toticostata, Gulella, 492. 
toukotoénsis, Planorbis, 125. 
trabonjiensis, Cleopatra, 290. 
Trachycystis, 484, 602. 
Trachylemus, 478. 
Trachypenzus, 67. 
Tralia, 102. 
Tralia, 101. 
transiens, Lanistes, 184. 
translucida, Physa tchadiensis var., 137. 
transparens, Achatina, 519. 
transvaalensis, Ancylus, 154. 
Burnupia, 152, 154, 454, 556, 568, 
Pl. XII, figs. 1-la. 
transversa, Htheria, 450. 
transversalis, Bulinus,. 137. 
Isidora, 137. 
Trapa, 90. 
trapezia, Aspatharia, 422. 
Spatha, 422. 
trapeziformis, Lanistes ellipticus var., 
194. 
trapezoidea, Burnupia, 152, 155, 568. 
trapezoideus, Ancylus, 155. 
Cerastus, 510. | 
traversii, Unio, 386. 
triandra, Themeda, 502. 
triangularis, Egeria, 362. 
Galatea, 362. 
Galatea bernardti var., 361. 
