88 
776. 
Ostrea spreta is subplicate ; O. Puelehana and O. Afquatorialis 
are smooth, and probably varieties of the same species, varying 
in form accordirg to the substance on which they are attached : 
some specimens of the latter have elongated, and others short, 
SHELLS OF SOUTH AMERICA. 
OstrREA AiQuaATORIALIS, d’Orb. Voy. v. 672. 
Ecuador ; Guayaquil ; Isle de la Luna. 
broad muscular scars, like O. Puelchana. 
ida 
The three muscular scars of the upper valve are nearly equal 
in size ; the two lower ones are equal, very near together, almost 
ANOMIA PERUVIANA, d’Orb. Voy. v. 673. 
Peru; Payta. 
confluent. 
fi 0. 
779. 
780. 
781. 
782. 
783. 
PLACUNOMIA FOLIACEA, Brod., d’Orb. Voy. v. 
674. 
Ecuador ; Guayaquil. 
Order III. PALLIOBRANCHES. 
TEREBRATULA Ma.Louina, d’Orb. Voy. v. 674. 
t.8). 4. 27-29. 
Isles Malouines. 
TEREBRATULA boRSATA, Lamk., d’Orb. Voy. 
v. 675. 
Straits of Maghellan. 
TEREBRATULA ROSEA, Mawe, d’Orb. Voy. v. 675. 
Brazils. 
TEREBRATULA FonTAINEI, d’Orbd. Voy. v. 675. 
Terebratula Chilensis, d’Orb. 
Chili; Coquimbo. 
TEREBRATULA CHILENSIS, Brod., d’Orb. Voy. 
v. 676. 
Chili; Coquimbo (bad state). 
