270 Annals of the South African Museum. 
Famity NERITIDA, Fleming, 1828. 
(Hist. Brit. Anim. p. 818, as Neritade, 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. (flwviatilis, Lin.). 
573. THEODOXIS KNORRI (Récluz). 
1841 Neritina knorri, Récl., Rev. Zool. Soc. Cuv. p. 274. D. 
1849 i knorru, Récl., Sow., Thesaurus Conch. ii. p. 511. 
pl. dla, i Grol Lah dO) eee 
beckiz, Récl., Sow., zbid. p. 512. pl. 109, f. 18. DF. 
1850 F knorri, Récl. (= beckit, Sow.), Récl., J. de C.i. p. 144. 
1855 bs . 7 ‘vei, Conch. Icon: pl; 2, f. 6 Da: 
A - becki hd * pl. .334. cule Dake 
1869 a knorrt °;; vou n Mts., Nachrichtsbl. d. Deutsch. Mal. 
Ges! 1. p. dad, dD. 
1875 ‘ 2 is = Conch. Cab. p. 55. pl. 8, f. 4-6. 
Dae. 
1897 #. “ - ~ D.-O.-Afr. p. 213. D. 
1899 5 yy ae PON Eye Oae 7 IN: 
peo ? 
Hab. Lorenzo Marques. Inhambane (Peters). 
Described from Madagascar and also known from Zanzibar. 
M. & P. (1899) remark “‘ Probably a form of N. pulligera.” 
574, THEODOXIS NATALENSIS (Reeve). [S.A.M. ] 
1848 Neritina zebra, “ Lam.,” Krs., Siidafr. Moll. p. 88. N. 
1855 fs natalensis, Rve., Conch. Icon. pl. 16, f. 75. DF. 
1877 = a , von Mts., Conch. Cab. p. 96. pl. 11, 
F100) day i. Dah 
1897 s ¥ fs D.-O.-Afr. p. 218. D. 
Originals in British ticsteen type not specified. 
Hab. Natau, Umgeni River (Krauss), Umkomaas (Burnup). 
Lorenzo Marques. Inhambane ; Tette (Peters). Delagoa (Junod). 
Also found in Central East Africa. 
575, THEODOXIS SOUVERBIANUS (Montrouzier), 
1861 Neritina sowverbiana, Montr., Gassies, Act. Soc. Linn. Bordeaux, 
xxiv. p: S09. pl 8) £70 Dee 
