650 
Sitagra, 479. 
sitifensis, Unio, 378. 
Smaragdia, 159. 
Smaragdine, 157. 
smitht, Biomphalaria, 115, 120. 
Cleopatra, 292, 569. 
Edgaria, 335. 
Edgaria nassa f., 335. 
Gonyodiscus, 517. 
Grandidieria, 398, 588. 
Limicolaria, 516. 
Micronyassia, 256. 
Mutela bourguignati var., 428. 
Nyassella, 251, 256. 
Paramelania, 335. 
Planorbis, 117, 120, 121 (Fig. 6), 
577, 578. 
Unio, 398. 
Unio burtont var., 398. 
Unio lourdelt var., 394. 
Vwipara, 205. 
smithiana, Baizea, 311, 589. 
Coulboisia, 310, 311. 
Stanleya, 311. 
sobaénsis, Unio, 385. 
sociabilis, Rosthramus, 535, 536. 
socotrensis, Auricula, 104. 
Auriculastra, 104. 
Planorbis, 116. 
soleilleti, Cleopatra, 293. 
Corbicula, 340. 
Limnexa, 114. 
Physopsis, 144. 
Unio, 386. 
Soleilletia, 337, 345. 
soleniformis, Mutela, 430, 432, 437, 587. 
solida, Iridina, 426. 
Physa trigona var., 138. 
solidum, Spherium, 347. 
solidus, Bulinus trigonus var., 138. 
Lanistes, 187. 
sollaudii, Macrobrachium, 7, 8, 28, 34. 
Palzemon, 28. 
soluta, Hautteceeuria, 303, 305. 
Tanganyicia, 305. 
Tanganytkia, 305. 
sordida, Ampullaria, 176. 
~ Celatura, 386, 408, 569. 
INDEX 
Nodularia, 408. 
Zairia, 408. 
sordulenta, Limnza, 108. 
soriculata, Melanza, 268. 
soror, Melania, 261. 
Melanoides nsendweensis, 254, 261, 
568. Pl. XXII, fig. 13. 
Nakuruélla, 515. 
sororcula, Nothapalus, 509, 512. 
Ptychotrema, 492. 
souverbiana, Neritina, 158. 
sowerbyanus, Helicarion, 493. 
Spatha, 411, 412, 413, 414, 415, 417, 419, 
420, 421, 422, 423, 424, 425, 426, 
427, 428, 429, 437, 438, 4389, 443, 
444. 
Spathella, 414, 415, 419, 420, 421, 422, 
423. : 
Spathopsis, 75, 411, 412, 419. 
Spathopsis, 422. 
spathuliformis, Spathella, 423. 
spatiosus, Africarion, 515. 
speciosa, Ampullaria, 176, 180. 
Pila, 176, 568. 
Spekea, 315. 
speker, Mutela, 441. 
Paludina, 206. 
Plezodon, 440. 
Pliodon, 440. 
Viviparus unicolor var., 206. 
Spekia, 70, 86, 249, 299, 300, 301, 314, 
315, 586, 589, 590, 591, 592, 593. 
speku, Cameronia, 440. 
Iridina, 85, 410, 489, 440, 529, 586, 
587, 588. Pl. XLIV, figs. 1-la. 
Pleiodon, 440. 
spencer, Cecilioides, 460, 602. 
sperabilis, Planorbis, 125, 126. 
Spheriastrum, 347. 
Spheriide, 71, 336, 337, 346, 453, 520, 
528, 546. 
Spherium, 71, 346, 347, 354, 355, 358, 
359, 534, 541, 569, 576, 578. 
Sphezroma, 563. 
Sphagnum, 542. 
spindale, Schistosoma, 94. 
spinosa, Pyrgulopsis, 222. 
spinulosa, Joubertia, 324, 590. 
