Illustrations xl 
PAGE 
Pontonia tyrrhena: from St. Paul de Loanda; female........................ 41 
Panulirus regius and ala arctus paradoxus: from Banana................ 48 
Details of species of Dardanus.. es banc OU ee 
Clibanarius chapini, new species: oo St. Bagh ae Lonade, PONG Ale oe 50 
Clhibanarvus cook: from Banatiagc o.oo Oe a 53 
Clibanarvis africanus: trom Banaia. < .o55 0000.2 55 
Diogenes denticuiatus: from Banana... .5.00 8 ee ee 
Pseudosquilla ferussacy: fom Banans. oo. 6. 6.2 a Pe 58 
Melampus lsberianus: from Bananas. 0000 a Oa ee 101 
Lymnexa natalensis undussumex: genitalia............ eee oe 
Lymnexa natalensis undussumex: teeth of a Kidada specimen ah Cm MS 118 
Planorbis 0dQwensie. Ue a 118 
Planorbis choanomphalus: from Kisenje, Lake Kivu.......................... 120 
Planorbis smith: from Kabare, Lake Kdwardoic ico. oe 121 
Planorbis sudanieus: from. Babreel-Ghazal.... 0... oe ee 122 
Planorbis gibbonsi: from Kabare, Lake Mdward::..ci 62s oe 126 
Planorbis avakubiensis: type, from Avakubi. Planorbis costulatus: Elizabethville 127 
Segmentina augusta: Kikondja and Elizabethville............................ 180 
Bulinus senegalensis: Marsh of Podor, Senegal....................00. 00.0570 189 
Teeth of Ampullariide........... Cu Peak our ee ei Ak a eee eae 168 
Pila congeensis: 2.0665 %: BS OMe ae iia WO aera, Ak a ee ee 172 
Pomacea Paludest.4 BoE IGE EE ee a, 174 
Lanistes nsendweensis and Lanistes procerus langr Mee Lee as 185 
Bulimus Kisalensis: from Kikondid.c 246.2 oe ee 217 
Bulimus alberti: trom Kabare, Lake Edward: ..: 00350 a es 
Bulimus humerosus: from Kisumu, Lake Victoria...:..................... 219 
Mysorella multisuleata: trom Vanganyika.. . 2.20 csie eo a Oe a 
Potamopyrgus ciliatus: from Cape Palmas.......... 223 
Lobogenes michaelis: head, both sexes; type aa bho. samatooes fiom Kimilole 
Riwer. 0 2205 fe as a ae 224 
Lobogenes spiralis: type, from Mimilolo River eo. <0.) ee 225 
Tomichia ventricosa: central tooth... 2665 eae ee 226 
Syrnolopsis lacustris. oo. ee le ees ee 229 
Syrnolopsis lacustris; Syrnolopsis lacustris molirensis..............5....6..... 280 
Syrnolopsis minute: Tanpatyilos 2070 a a 231 
Syrnolopsis minuta carinifera: sections; Tanganyika....................... 233 
- Syrnolopsis gracilis, type; trom Tanganyika... 660.05 .8) ee oe 234 
Anceya giraudi: Kasakalawe; Anceya admirabilis.............00000 0000s 236 
Sections of Anceya giraudi and Anceya admirabilis; Anceya admirabilis from 
Tanganyike, 6 oj eh a 237 
Anceya bella: type from Tanganyika. ...-.5 2 Oe ee 238 
Marteha tangonyiens:s,.... 2 22 ee RIN LSC NG Nobody Satan 240 
Teeth of Trumeatetia caribwensias oO eee 241 
Pseudogibbula duponti cnc ae ey de Ue es 244 
Teeth of Melanotdes. wagenias. 6 ke Oh ee 252 
Melanoides EinshGssdenti sinc ie OEE A OL PE eS 259 
Melanoides imitate... RPE OS a 265 
