ARCA. Pana/ma Shells. 261 



420. Area Reereana. 



/Synonymy. 



Area Helhlingii Reeve (non Brug.) Conch. Icon. spec. 



90 pars. pi. 14. f. 90 ? - - Apr. 1844. 

 Reeveana Orb. Voy. Amer. Merid. Moll. p. 635. 1846. 



Station. — Under stones at low water ; Outning I Reeve. 

 Our specimens were found in the same situation. 



HaMtat. — St. Elena, Monte Christi ; Cuming I Reeve. 

 Payta; Fontaine I Orbigny. 

 Panama ; C. B. A. I 

 9 specimens were collected : one of ttem is nearly 4 inches 

 long. Mr. Reeve mentions also I. Corregidor, Philippines, 

 where probably the true A. Helhlingii was obtained. 



421. Area rcTersa. 



Synonymy. 



Area reversa Sowb. in Proc. Zool. Soc. Lond. p. 20. Feb. 1833. 



Mull. Syn. Test. Viv. p. 180. 1836. 



hemicardium Koch, in Phil. Abbild. I. pi. 1. f. 1. Mar. 1843. 



reversa Reeve Conch. Icon. pi. 1. f. 6. Dec. 1843. 



Orb. Voy. Amer. Merid. Moll. p. 635. 1846, 



Station. — Soft mud, at the depth of 7 fathoms ; Cuming I 

 Sowerby : also Reeve. 



Habitat. — Tumbez ; Cuming I Sowerby : also Reeve : also 

 Orbigny. 



Unknown: Koch. 



Panama ; C. B. A. I 

 4 odd valves were found. 



422. Area similis. Nov. sp. 



Shell ellipsoidal, very inequilateral, slightly aurioulate : infe- 

 rior margin subrectilinear ; anterior and posterior margins well 



JULY, 185S. 66 Am. Lto. Nat. Hist. 



