376 



MACTRINjE. 



coruea, Desk. 

 Cumingii, Desk. 

 cuneata, Chem. 

 cygnea, Chem. 

 decora, Desk. 

 disco rs, Gray. 

 dissimilis, Desk. 

 epidermia, Desk. 

 exirnia, Desh. 

 fasciata, Lam. 

 gibbosula, Desh. 

 glabrata, Linn. 

 glauca, Born. 

 graudis, Lam. 

 hepatica, Desh. 

 hians, Phil. 

 inaDqualis, Desh. 

 incarnata, Desh. 

 incongrua, Desh. 

 inflata, Brown. 

 iutuspicta, Desh. 

 Isabellina, D'Orb. 

 Largilliertii, Phil. 

 lilacea, Lam. 

 lurida, Phil. 

 Luzonica, Desh. 

 maculata, Chem. 

 mera, Desh. 



meretriciformis, Desh. 

 mitis, Desh. 

 Murcbisoni, Desh. 

 obesa, Desh. 

 olorina, Phil. 

 opposita, Desh. 

 ornata, Gray. 

 Petitii, DVrb. 

 pulcln'a, Gray. 

 pura, Desh. 

 pusilla, A. Adams. 

 quadrangularis, Desh. 

 radiolata, Desh. 

 Reevei, Desh. 

 Saulise, Gray. 

 scalpellum, Desh. 

 semistriata, Desh. 

 semisulcata, Desh. 

 sericea, Desh. 

 stultorum, Linn. 

 subrostrata, Desh. 

 sulcataria, Desh. 

 symmetrica, Desh. 

 tristis, Desh. 

 tumida, Chem. 

 veneriformis, Desh. 

 violacea, Chem. 

 virgo, Desh. 



Genus MACTRINULA, Gray. 



Shell trigonal, thin. Hinge with the cardinal teeth small ; 

 lateral teeth short, very close to the cardinal ; hinge-margin 

 double; ligament marginal, triangular, separated from the 

 cartilage-pit by a shelly ridge. Pallial sinus rounded. 



Syn. Papyrina, part, Morch. Blainvillia, Hupe. 



Ex. M. plicataria, Chemnitz, pi. 99, fig. 2, 2, a. 



The shells of tiiis genus are thin, more or less plicated, 



