GALATEA. 407 



in the left valve ; ligament external. Fallial impression 

 sinuated. 



Syn. Capsa, Lam., 1818, not 1801. Donacina, F6rus. 

 Procos, Gistel. 



Ex. I. la?vigata, Gmelin, pi. 104, fig. 6, 6, a. 



The species of Ij)I/i(/enta are found in estuaries in Brazil, 

 Central America, and Senegal; one species (/. vcntricosa) 

 has the beaks eroded, and the surface of the valves is rayed 

 like Galatea. 



Sjyecies of Iphigenia. 



altior, Souk media, Shuttl. 



Braziliensis, Lam. ventricosa, Phil. 



laevigata, Gmel. 



Genus GALATEA, Bruguiere. 



Shell thick, solid, equivalve, sub-trigonal, covered with a 

 thick, horny epidermis. Hinge with the cardinal teeth 

 grooved, two in the right valve united at their bases ; three 

 in the left, the intermediate anterior and separate ; lateral 

 teeth two, remote ; ligament short, external, prominent, 

 tumid. Tallial line sinuated. 



Syn. Egeria, Roissy, not Lea. Potamophila, Sow. 

 Megadesma, Bowdich. Galateola, Fleming. 



Ex. G. paradoxa, Born, pi. 105, fig. 2. Shell, G. 

 paradoxa, fig. 2, a, 2, b. 



The species of Galatea, which are all covered with a 

 greenish epidermis, are few in number, and are found in 

 the sandy flats of the Nile and the rivers of Western 

 Africa, sometimes as far as twenty miles from the sea. The 

 mantle of the animal is freely open, the margin is simple, 



