ARCA. Panama Shells. 261 



420. Area Reeveana. 



Synonymy. 



Area Helblingii 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 ; Cuming ! Eeeve. 

 Our specimens were found in the same situation. 



Habitat, St. Elena, Monte Christi ; Cuming ! Eeeve. 

 Payta; Fontaine! Orbigny. 

 Panama ; C. B. A. ! 



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

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

 where probably the true A. Helblingii was obtained. 



421. Area re versa. 



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. 5. Dec. 1843. 



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



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

 Sowerby : also Keeve. 



Habitat. Tumbez ; Cuming ! Sowerby : also Eeeve : also 

 Orbigny. 



Unknown : Koch. 



Panama ; C. B. A. ! 

 4 odd valves were found. 



422. Area similis. Nov. sp. 



Shell ellipsoidal, very inequilateral, slightly auriculate : infe- 

 rior margin subrectilinear ; anterior and posterior margins well 



