270 Annals of the South African Museum. 



FAMILY NEBITID^E, Fleming, 1828. 



(Hist. Brit. Anira. p. 318, as Neritadae, emend. Turton, 1831, Manual, pp. 10, 138.) 



GENUS THEODOXIS, de Montfort, 1810. 



(Conch. Syst. ii. p. 350.) 

 ( = Neritina, Lam., 1822 [Neritine, 1809].) 



Type of Genus, T. lutetianus, de Montf. (fluviatilis, Lin.). 



573. THEODOXIS KNORKI (E6cluz). 



3841 Neritina knorri, Reel., Eev. Zool. Soc. Cuv. p. 274. D. 



1849 ,, knorrii, E6cl., Sow., Thesaurus Conch, ii. p. 511. 



pi. Ill, f. 78. pi. 113, f. 150. D.F. 

 beckii, Reel., Sow., ibid. p. 512. pi. 109, f. 13. D.F. 



1850 ,, knorri, Reel. ( = beckii, Sow.), Reel., J. de C. i. p. 144. 

 1855 Eve., Conch. Icon. pi. 2, f. 6. D.F. 



beckii pi. 3, f. 11. D.F. 



1869 ,, knorri ,, von Mts., Nachrichtsbl. d. Deutsch. Mai. 



Ges. i. p. 154. D. 

 1875 Conch. Cab. p. 55. pi. 8, f. 4-6. 



D.F. 



1897 D.-O.-Afr. p. 213. D. 



1899 M. & P., A.M.N.H. iv. p. 194. N. 



Type ubi ? 



Hab. LOBENZO MARQUES. Inhambane (Peters). 

 Described from Madagascar and also known from Zanzibar. 

 M. & P. (1899) remark " Probably a form of N. pulligera." 



574. THEODOXIS NATALENSIS (Beeve). [S.A.M.] 



1848 Neritina zebra, "Lam.," Krs., Stidafr. Moll. p. 88. N. 

 1855 ,, natalensis, Eve., Conch. Icon. pi. 16, f. 75. D.F. 

 1877 von Mts., Conch. Cab. p. 96. pi. 11, 



f. 10, 11, 15. D.F. 

 1897 D.-O.-Afr. p. 213. D. 



Originals in British Museum, type not specified. 



Hab. NATAL. Umgeni Elver (Krauss). Urnkomaas (Burnup). 



LORENZO MARQUES. Inhambane ; Tette (Peters). Delagoa (Junod). 



Also found in Central East Africa. 



575. THEODOXIS SOUVERBIANUS (Montrouzier). 



1861 Neritina souverbiana, Montr. ,Gassies, Act. Soc. Linn. Bordeaux, 



xxiv. p. 309. pi. 8, f. 7. D.F. 



