162 ! Bulletin American Museum of Natural History [Vol. LIII 
mouth of the Congo opposite Banana point, on the alge covered sand- 
banks of the creeks toward Moanda, and on the shallow flats near the 
shore farther up river. The latter are formed chiefly by the fine rootlets 
of mangroves over which exceptionally strong tides wash. At low tide 
they were literally covered by these tiny mollusks that gave them a 
particularly dark appearance.” (H. L.). 
Subgenus NERIPTERON Lesson 
Neritina subgenus Neripteron Lusson, 1831, ‘Voyage de la Coquille, Zoot,’ I, 1, 
p. 384. Type by designation of H. B. Baker (1923): Neritina taitensis Lesson. 
Neropterum Acassiz, 1846, ‘Nomencl. Zool. Index Univ.,’ p. 249; emendation of 
Neripteron. 
Neritina subgenus Neritopteron FiscHer, 1885, ‘Manuel de Conchyl.,’ p. 802. 
Emendation of Neripteron Lesson. _ 
Shell with reduced spire, the aperture enlarged and often produced into wings. 
Radula: unpaired central with a rectangular, plane, upper surface or area; inner 
lateral roughly triangular, but transversely elongate so as to be as large or larger 
than lateral complex; of the two fused outer laterals, the inner one is well developed, 
while the outer one has shallow reflections and moderately developed, though distinct 
major and minor cusps. 
H. B. Baker places N. oweniana (Wood) in the section Alina Récluz 
of this subgenus. Unfortunately, it seems to have been overlooked that 
Clypeolum was used by Récluz in 1842 (Rev. ‘Zoolog. Soc. Cuviér., p. 
235) for the group of auriculate Nerztine which are globular and have the 
labrum laterally expanded. Below, on the same page, Récluz uses the 
name Alina for exactly the same group! Clypeolum Récluz, 1842 (type: 
Neritina latissima Broderip) must therefore be used in place of Alina 
Récluz, 1842. Clypeolum Récluz, 1850 (Journ. de Conchyl., I, p. 144), 
on the other hand, is a plain synonym of Neritina Lamarck, having the 
same genotype. ‘ 
Neritina (Neripteron) oweniana (Wood) 
Plate XIII, Figures 16—27 
Nerita oweniana Woop, 1828, ‘Index Test., Suppl.,’ p. 25, Pl. vit, fig. 8 (Africa, 
‘without more definite locality). 
Neritina (Neritz#a) oweniana ‘‘Gray’’ E. v. Martens, 1879, in Martini and 
Chemnitz, ‘Syst. Conch. Cab., II, 10, Neritina,’ p. 75, Pl. 1x, figs. 14-17. Tryon, 
1888, ‘Manual of Conchol.,’ X, p. 76, Pl. xx11, fig. 90. 
Neritina owenii Gray, 1831, ‘Zoolog. Miscellany,’ p. 11. 
Neritina owent Gray. GERMAIN, 1908, Journ. de Conchyl., LVI, p. 111. 
Neritina (Neritxa) hesset O. BarracEr, 1885, 24. u. 25. Bericht Offenbacher Ver. 
f. Naturk., p.194. C R. Barrasr, 1918, Ann. Soc. Zool. Malacol. Belgique, XLVII, 
(1912), p. 108, Pl. 11, figs. 4a-b. 
