374 Bulletin American Museum of Natural History [Vol. LITI 
showing some wide, dusky rays), minutely laminate, chiefly at the ends. The interior 
is violet, varying in shade, usually showing some light rays by transmitted light. 
Hinge line very narrow. Middle cardinal tooth in the right valve triangular, deeply 
bifid, anterior cardinal very narrow; laterals very weak and narrow. In the left 
valve two subequal, triangular cardinals. Pallial sinus ample, extending a little 
beyond the middle of the shell’s length. 
Length, 27.2 mm.; height, 18.0 mm.; diameter, 12.5 mm. ‘Type. 
Dag more) ore! epee 116 Paratype. 
behets. ©) ‘14.3 z LO:7 
ns Demes Ope SES: OL) ‘ 10.7 
This species is decidedly thinner than the Liberian J. delessertit 
(Bernardi), less triangular, with a far weaker hinge-plate and weaker 
teeth. It is perhaps the species of the Congo estuary identified as 
Fischeria delessertit by C. R. Boettger. 
Iphigenia centralis (Germain), of the middle Niger, resembles this 
species closely in outline and teeth, but it is described as thick and solid, 
while the Congo shell is very thin. J. messagert and I. approximans 
(Preston), from the Senegal River, appear to belong to the same group. 
Preston mentions a “F’. levigata von Mts.” as allied to I. approximans; 
probably Iphigenia levigata (Gmelin) was intended. 
Other Species of Iphigenza Recorded from the Belgian Congo 
Iphigenta lenzr (Dautzenberg) 
Fischeria lenzi DAUTZENBERG, 1891, Bull. Ac. Sci. Belgique, (83) XX, (1890), p 
578, Pl. 111, figs. 83-8. (? C. R. Baxrresr, 1913, Ann. Soc. Zool. Malacol. Belgique, 
XLVII, (1912), p. 114). 
Described originally from a pocket in the Congo alluvium, 15 m. above high 
water, near the mission of Nemlao, back of Banana (KE. Dupont Coll.). 
This species may turn out to be a form of J. curta (Dunker), 
but we have hesitated to place it in the synonymy of that species on 
account of the decidedly smaller, less inflated beaks shown in Dautzen- 
berg’s figures, though the other characters and the dimensions agree well. 
We therefore suspend judgment until authentic or topotypic examples 
can be compared with the living J. curta. 
We have little doubt that the specimens collected alive by P. Hesse 
at San Antonio and referred by C. R. Boettger to I. lenzi are really I. 
curta, since that species is abundant on the sandbanks there. 
Iphigenia levigata (Gmelin) 
Donax levigata GMELIN, in Linneus, 1791, ‘Syst. Nature,’ 13th Ed., p. 3265; 
based upon CHEmnitz, 1782, ‘Syst. Conch. Cab.,’ VI, p. 253, Pl. xxv, fig. 249 (not 
binomial; said to have come from Tranquebar). 
