62 Annals of the South African Museum. 



The arrangement of Families and Genera is in accordance with 

 the latest views of leading authorities on the subject. That of the 

 higher orders is a slightly modified adaptation of Paul Pelseneer's 

 classification of the Mollusca in Part V. of Sir E. Eay Lankester's 

 " Treatise on Zoology." (London, 1906.) 



In the use of Family names, I have followed those writers who 

 employ a few only, in a wide sense, rather than a larger and possibly 

 unnecessary number of smaller families. 



April, 1912. 



REFERENCE LIST. 



SUB-KINGDOM MOLLUSCA, Cuvier, 1795. 



(La Decade Philos. Litt. et Politique, Paris, v. p. 391, as Mollusques.) 



GRADE PRORHIPIDOGLOSSOMORPHA, Grobben, 1894. 



(Sitz.-Ber. Akad. Wiss. Wien, p. 86.) 



CLASS GASTROPODA, Cnvier, 1795. 

 (Magasin Encycl. ii. p. 448, as Gasteropodes. ) 



SUB-CLASS EUTHYNEURA, Spengel, 1881. 



(Zeitschr. f. wissens. Zool. Leipzic, p. 372.) 



ORDER PULMONATA, Cuvier, 1817. 

 (Regne Anim. ii. pp. 387, 401, as Pulmones.) 



SUB-ORDER STYLO MMATOPHORA, Schmidt, 1855. 

 (Abhandl. Naturwiss. vereins. Sachs. Halle, p. 7.) 



TRIBE AGNATHA, Morch, 1859. 



(Mai. Blatt. vi. p. 109.) 



FAMILY APEKID^E, Mollendorff, 1903. 



(Conch. Cab. p. 5.) 



GENUS APEBA, Heynemann, 1885. 



(Jahrb. d. Deutsch. Mai. Ges. xii. p. 20.) 



( = Ghlamydcplicrus, Binney, 1879, not Chlamydopliorus, Harlan, in 



Mammalia 1825.) 



Type of Genus A. gibbonsi (Binn.) 



1. APERA BUENUPI, Smith. 



1892 Apera burnupi, Smith, A.M.N.H. x. p. 466. D. 

 1897 Cllge., A.M.N.H. xx. p. 221. pi. 5, 



I 1-6. A, 



