MARINE MOLLUSCA OF THE UNITED STATES. 1S) 
5. P.ornatus, Lamarck. Fig. 541. 
Anim. sans Vert., vi. 176. 1819. 
Subequivalve, depressed, inequilateral, oblique, ribs thirty to 
thirty-six, alternately smaller and subscabrous; one ear minute, 
yellow ochraceous or white profusely blotched with angular red 
markings. 
Length 1 inch, width 20 mill. 
North Carolina, southwards. 
6. P. Noposus, Linneeus. Fig. 542. 
(Ostrea.) Syst. Nat., edit. xii. 1145. 1767. 
Shell with nine thick rounded ribs, and strong radiating striae ; 
ribs with large hollow vesicles. Reddish-brown, orange, or white. 
Diameter 2-5 inches. 
North Carolina, southwards. 
P. pustutosus, Verrill, Amer. Journ. Sci., v. 14. 1873. “St. 
George’s Banks.” 
This is probably, from its small size,an immature shell. It has 
not been figured, and besides, is extra-limital. 
Genus LIMA, Bruguiere. 
Encyc. Meth., t. 20, f. 6. 1792. 
The animal has double mantle-margins, the inner pendent, 
fringed with long tentacular filaments, ocelli inconspicuous; foot 
finger-like, grooved; lips with tentacular filaments, palpi small, 
striated inside; gills equal on each side, distinct. 
The Limas are either free or spin a byssus; some make an 
artificial burrow when adult, by spinning together sand or coral 
fragments and shells. The valves are always white. About 
twenty species are known. 
1. L. scapra, Dillwyn. Fig. 543. 
Recent Shells, 271. 1815. 
Ostrea glacialis, Gmelin (pars), Syst. Nat. 
Shell oval, subequilateral, with numerous subscabrous strive ; 
margin entire. 
Length 2.25, width 1.5 inches. 
Southern Coast. West Indies. 
2. L. sqguamosa, Lamarck. Fig. 544. 
Anam. sans Vert., vi. sp. 2. 1819. 
Shell ovate, inequilateral, with strong, scaly ribs; hinge oblique}. 
margin plicated. 
Length 1.5, width 1 inch. 
Southern Coast to West Indies. 
