1927] Pilsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 35 
Iphigenia levigata ‘Chemnitz’? Ramer, 1869, in Martini and Chemnitz, ‘Syst. 
Conch. Cab.,’ X, 3, Donacider, p. 111, Pl. 1, fig. 7 and Pl. xrx, figs. 11-13 (Gaboon). 
DAUTZENBERG, 1912, Ann. Inst. Océanogr. Monaco, V, 3, p. 95 (Konakry and Rotuna, 
French Guinea). 
Recorded by Dautzenberg from the estuary of the Congo at Banana (Gruvel 
Coll.). 
| Cyrenoidids 
Characters of the following genus. 
CYRENOIDA de Joannis 
Cyrenoida DE JOANNIS, June, 1835, Mag. de Zool., V, Moll., Pl. ux1v, with text; 
monotype: Cyrenoida dupontia de Joannis. Dau, 1903, Trans. Wagner Free Inst. 
Sci. Philadelphia, ITI, p. 1334. , 
Cyrenella DesHAYES, February, 1886, Mag. de Zool., V, (1835), Moll., Pl. txx, 
with text (anatomy). Substitute for Cyrenoida de Joannis. 
Cyrenoides G. B. SowERBY, 1842, ‘Conchol. Man.,’ 2d Ed., p. 135, fig. 114, with 
C. dupontia de Joannis. Misspelling of Cyrenoida. 
Cyrenoidea HANEY, 1846, ‘Ill. Cat. Rec. Biv. Shells,’ Expl. Suppl., Pl. xv, p. 10. 
Misspelling of Cyrenoida. 
Cyrenodonta H. and A. Apams, 1858, ‘Gen. Recent Moll.,’ IT, p. 453, as a synonym 
of Cyrenoida. 
The shell is orbicular, with small beaks at about the anterior third, thin. Hinge 
with a thin, 7-shaped cardinal in each valve and a smaller, lamellar or v-shaped 
cardinal below it in the right valve; the narrow hinge-plate rounded posteriorly, 
without lateral teeth. Ligament external. Muscle scars and pallial line very faintly 
impressed, the latter entire. : 
Species few, in Australia, the Philippines, West Africa, and Middle 
America. 
The following African species have been described. 
Cyrenoida dupontia pm JoANNIs, June, 1835, Mag. de Zool., V, Moll., Pl. uxiv, 
with text =Cyrenell1 sp. DesuayEs, February, 1836, op. cit., V, (1835), Moll., Pl. 
LXx, with text (anatomy). Cyrenoides dupontiti Woopwarp, 1854, ‘Manual of the 
Mollusca,’ p. 298, Pl. xix, fig. 19. Cyrenella (Cyrenoida) dupontie A. D’ AILLY, 1896, 
Bihang Svenska Vet. Ak. Handl., XXII, Afd. 4, No. 2, p. 131. Senegal River. 
Cyrenoida rhodopyga (E. v. Martens) =Cyrenoidea rhodopyga E. v. MARTENS, 
1891, Sitz. Ber. Ges. Naturf. Fr. Berlin, p. 18. Mayumba, French Congo. 
Cyrenoida rosea (A. d’Ailly) =Cyrenella rosea A. D’ AILLY, 1896, Bihang Svenska 
Vet. Ak. Handl., XXII, Afd. 4, No. 2, p. 131, Pl. v, figs. 24-30. Ekumbi, Cameroon. 
This appears to be specifically distinct from the foregoing, since besides the difference 
in size its height is relatively less. 
Cyrenoida rosea brevidentata Pilsbry and Bequaert. See below. 
Cyrenoida senegalensis (Deshayes). See below. 
1Not “‘Cyrénodonte”’ (French vernacular) of de Joannis, February, 1836, Mag. de Zool., V, (18385), 
last page of text following Moll. Pl. uxx. 
