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THE NON-M ARINE MOLLUSCA OF PORTUGUESE 

 EAST AFRICA. 



By M. Connolly. 



(With Plates IV to VIII and thirty Text-figures.) 



CONTENTS. 



Introduction 



Map of Lorenzo Marques 



Systematic account. 



Streptaxidae 



Rhytididae 



Zonitidae . 



Urocyclidae 



Endodontidae 



Enidae 



Pupillidae . 



Achatinidae 



Ferussaciidae 



Succineidae 



Veronicellidae 



Onchidiidae 



Auriculidae 



Limnaeidae 



Physidae . 



Planorbidae 



Ancylidae . 



Pomatiidae 



Ampullariidae 



PAGE 



105 

 111 



110 

 122 

 123 

 138 

 139 

 152 

 164 

 165 

 186 

 186 

 187 

 187 

 ' 187 

 188 

 189 

 190 

 200 

 202 

 207 



Viviparidae 

 Tiaridae 

 Assimineidae 

 Truncatellidae 

 Neritidae . 

 Unionidae . 

 Mutelidae . 

 Cyrenidae . 



New genera and species. 

 Rhachistia, gen. n. 

 Limicena, gen. n. 

 Gulella nepia, sp. n. 

 Kirkia gibbonsi, nom. n. 

 Trachycystis cressyi, sp. n. 

 „ fossula, sp. n. 



NesopujM vengoensis, sp. n. 

 Pseudoglessula cressyi, sp. n. 

 Opeas praecox, sp. n. 

 Ferrissia junodi, sp. n. 



Index .... 



Explanation of plates 



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 209 

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163 

 169 

 121 

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 142 

 142 

 165 

 174 

 183 

 200 



216 



218 



Introduction. 



Peculiarly little has hitherto been written about the molluscs inhabiting 

 the large tract of Portuguese territory in East Africa, which is divided into 

 Mozambique, on the north, and Lorenzo Marqiies, on the south, by the 

 R. Zambesi. 



While Portuguese West Africa has been pretty thoroughly searched by 

 various explorers since the days of Welwitsch, and the results fully treated 

 by Morelet and Nobre, hardly any early traveller seems to have done much 

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