H-9 



Var. a. Testd lameUis crebrioribus , frondibus brevioribus. 



Hab. cum prsecedente. 



Var. b. Testd toid purpured, lamcllis creberrimis, frondibus brevis- 

 simis. 



Hab. ad Mexico. (Gulf of Tehuantepec.) 



Dredged up from sandy mud attached to Aviculce (Meleagrince, 

 Lam., Margaritae, Leach,) at a depth of ten fathoms. 



Chama pellucida. Chama testd albd rosea seu ruh-o fucatd vel 

 strigatd, lamelUs frequentibus, frondibus elongatis pellucidis; in- 

 tits albd, limbo crenulato. 



Hab. ad Peruviam. (Iquiqul.) 



Dredged up attached to stones, Mytili, and turbinated shells, at a 

 depth varying from nine to eleven fathoms, from a bottom of coarse 

 sand, and also found under stones at lov/ water mark. 



In old specimens the foliations and lamellce are completely worn 

 down, and the shell has somewhat of a crystalline appearance ; — 

 indeed it is always semitransparent. 



Chama lobata. Chama testd albd, lobatd, subrhomboided, radi- 

 atim striata, lamellis creberrimis, fimbriatis, foliaceis, striatis >• 

 Umbo interna crenato. 

 Hab. ad Insulam Nevis. 



Found attached to small stones and shells, at Nevis in the West 

 Indies, in sandy mud, and at a depth ranging from four to ten fa- 

 thoms. 



Chama Pacifica. Chama testd 7'ubrd purpured vel luted, lamellis 

 creberrimis, foliis seu squamuUs brevioribus interdum albidis ; 

 Umbo interna crenato. 



Hab. in Oceano Pacifico. (Lord Hood's Island. — Pearl Islands.) 



The infinite variety of this species in shape and colour defies de- 

 scription. In many points it agrees with Lamarck's Chama forida, 

 but he describes the margin of that shell as entire, whereas the mar- 

 gin of Chama Pacifica is strongly crenated. 



Mr. Cuming's specimens were obtained by diving. They were 

 attached to Avicula, at a depth ranging from three to seven fathoms. 

 Many shells of this species were brought to this country some yeare 

 ago, from the Pearl Islands, by Mr. Samuel Stutchbury. 



Chama imbkicata. Chama testd lamellosd, squamis imbricatd, ul- 

 bidd purpureo-fusca varid ; valvd superiore subdejjrcssd, sublo- 

 batd, sinu ab umbone usque ad limbum currente ; inttts ulbidd, 

 limbo Integra, scepissime nigra-purpurea. 

 Hab. in Oceano Pacifico. (Lord Hood's Island. — Pearl Islands.) 

 This grows to a large size, and was obtained by diving, attached 

 to Aviculce, at a depth ranging from three to seven fathoms. I'lu-re 

 is generally a purple spot at the tip of the umbo of the upper 

 valve. 



This species was also brought home in considerable numbers by 

 Mr. Samuel Stutchbury from the Pccul Islands, 



