368 Bulletin American Museum of Natural History [Vol. LIII 
One specimen of the long series collected has, near the base, shallow 
radial depressions transversely striate much as in EH. congica, otherwise 
having the characters of E. nux (Fig. 82). 
Other Species of Egeria Recorded from the Belgian Congo 
Egeria paradoxa (Born) 
Venusd paradoxa Born, 1780, ‘Test. Mus. Vindobon..,’ p. 66, Pl. tv, figs. 12 and 
13 (habitat unknown). 
Galatea paradoxa Born. GERMAIN, 1918, Bull. Mus. Hist. Nat. Paris, p. 133, 
figs. 20 and 21 and PI. 111, figs. 18 and 19. With var. unicolor “ Bernardi’ and var. 
multiradiata “ Bernardi,’’ p. 130; var. olivacea “‘ Bernardi,” p. 131, fig. 21; and var. 
purpurea, p. 131. See for full references to literature. 
Venus meretrix var. 8 GMELIN, 1791, ‘Syst. Nat.,’ 13th Ed., I, 6, p. 3273; based 
upon Venus paradoxa Born (‘In Oceano Indico’’). 
Venus hermaphrodita GMELIN, 1791, op. cit., I, 6, p. 83278 (Guinea); based upon 
Venus reclusa, etc., CHEMNITZ, 1782, ‘Conchyl. Cab.,’ VI, p. 326, Pl. xxx1, figs. 327-329. 
3 Venus subviridis GMELIN, 1791, op. cit., 1, 6, p. 3280 (locality unknown). 
Galathea radiata Lamarck, 1804, Ann. Mus. Hist. Nat. Paris, V, p. 433, Pl. 
XXVIII (supposed to be from the rivers of Ceylon). Rane, 1832, Ann. Sec. Nat., 
XXV, p. 160, Pl. v, figs. 1-3 (anatomy). 
Galatea radiata Lamarck. BERNARDI, 1860, ‘Monogr. Galatea,’ p. 18, Pl. vit, figs. 
1-5 and PI. vim, fig. 3 (with varieties wnicolor, multiradiata, and olivacea, on p. 19). 
HE. v. Martens, 1877, Monatsber. Ak. Wiss. Berlin, (1876), p. 271. (?GmRMAIN, 
1916, Ann. Mus. Civ. Genova, (3) VII, [XLVII], p. 310, fig. 8). 
Donax variegata Perry, 1811, ‘Conchology,’ Pl. tv, fig. 1, with accompanying 
letter-press (no locality mentioned). 
From an inspection of numerous specimens and of the published 
descriptions and figures, we think that probably two subspecies or 
possibly species are involved in the synonymy of paradoxa and radiata 
of authors. As most of our specimens are not definitely localized, and 
we have not the means of deciding what forms were actually before part 
of the many authors who have treated of these shells, a definite separation 
has not been carried out at this time. 
Typical E. paradoza, as figured by Born, has a relatively narrow 
hinge-plate, in which the middle cardinal tooth of the right valve is 
rather narrow, and bifid along the summit. The shell is rather light for 
an Hgerza of its size; length, about 86 mm.; height, about 67 mm. The 
habitat of this race is unknown. It chides G. radiata Lamarck and D. 
variegata Perry. 
EKgeria paradoxa ee (Gmelin) is a more solid shell with 
larger, prominent beaks. The dual nature of the middle right cardinal 
tooth is apparent, as it has the shape of an inverted V (A), and the hinge- 
plate is wider. This form is what Rang (1832) figured from the coastal 
