AKCA. Panama Shells. 26S 



rately, excurved ; anterior margin well rounded : dingy white, 

 with blackish brown epidermis: with numerous very pro- 

 minent but very narrow linear ribs, which are often alter- 

 nately large and small, and of which a few at each extremity 

 are a little stouter and are subnodulous ; with a few indistinct 

 concentric lines : umbones prominent, flattened : area of the 

 ligament very narrow, anteriorly widened abruptly: margins 

 of the interior finely and irregularly crenulated: middle teeth 

 very small. The epidermis is between pilose and lamellar, 

 with the points long posteriorly. 



Length 1.3 inch ; height .85 inch ; breadth .65 inch. 



Station. — Under stones near low water mark. 



Habitat. — Taboga and Panama ; C. B. A. I 



60 specimens were collected, mostly at Taboga. 



426. Area tuberculosa. 



Synonymy. 



Area tuberculosa Sowb. m Pfoc. Zool. Soc. Lond. p. 19, Feb. 1833. 



Mull. Syn. Test. Viv. p. 119. 1836. 



Phil. Abbild. I. pi. 1. f. 2. Mar. 1843. 



Reeve Conch. Icon. pi. 3. f. 18. Jan. 1844, 



Hanley Descr. Catal. p. 161. 1845? 



Station. — Found at low water at the roots of the mangrove 

 trees; Cuming! Sowerby: also Eeeve. Our specimens were 

 found in impalpable mud, under a mangrove thicket, near high 

 water mark. 



Habitat. — Eeal Llejos ; Cuming 1 Sowerby : also Eeeve, 

 Pacific Ocean, Central America ; Philippi. 

 South America ; Hanley, 

 Eeal Llejos ; Jay, 



Mazatlan ; Lt, Green I Mus, Essex Inst, 

 Panama ; 0. B. A. 1 



