MOLLUSCA. 471 



Family AVICULIDJ3. 



116. Melegrina margaritifera (?), L. 



117. Avicula radiata, Ttesh, 



118. A. sp. 



Perhaps a variety of the last. 



119. Malleus regula, 'Eoisk. 



Family AECIDiE. 



120. Area imbricata, Brug. 



121. A. (Barbatia) decussata, Sow. 



122. A. (Scapharcd) incequivalvis, Brug. 



123. A. (^Anomalocardia) scapha, Chem. 



124. Pectunculus roseus(1), Ev. 



Family SPONDYLIDiE. 

 125. Spondylus, sp. 

 I cannot discriminate the species of this genus. 

 126. Plicaiula iiribncata, Menke. 



Family OSTEEID^. 



127. 0, mytiloides, Lam. 



128. 0. sp. 



On mangroves. 



III. 

 FRESHWATER MOLLUSCA. 



Of these but very few were obtained, as I had no 

 opportunity of visiting the large rivers. For a complete 

 account of the species of land . and freshwater moUusca 

 previously known to exist in Abyssinia, see V. Marten's 

 " Malakozoologische Blatter" for 1865, vol. xii., and 

 1866, vol. xiii. 



