1901.] 



MOTHER-OF-PEARL OYSTERS. 



383 



The interior of the Hp is whitish, the dark radii showing up as 

 broad, sometimes confluent, black blotches. The nacre is as in 

 M. carcliariarum. 



From hinge to venti'al margin this shell measures 70 mm., 

 do. to margin of nacre 57 mm. Total autero-posterior measure- 

 ment of shell 70 mm. ; do. nacre 55 mm. ; do. hinge 55 mm. 



Text-fig. 93. 



Margaritifera natalensis, nat, size. 



Log. Umkomaas, near Durban, 3 specimens. 



A specimen from Durban, J. H. Ponsonby, 96.9.25.8, though 

 differing slightly in iorra from these examples, is probably the 

 same species. 



Species 7. Margaritifera. elexuosa. 



Avicula jlexuosa, Eeeve, 1857, sp. 4. 



Cape Hillsborough, Australia. Type in Brit. Mus. 



The folloM'ing unlocalized species seem to be closely allied to the 

 M. sugillata group. 



Species 8. Margaritifera citrina. 



Avicula citrina, Dunker, 1852, p. 68 ; loc. incogn. 



Avicula {Meleagrina) citrina, Dunker, 1872, p. 14, tab. 3. fig, 4, 



