149 



Var. a. Tesld lamellis crebrioribus , frondibus brevioribus. 



Hab. ciim prsecedente. 



Var. b. Testd totd purpured, lamellis creherrimis, frondibus brevis- 

 simis. 



Hab. ad Mexico. (Gulf of Tehuantepec.) 



Dredged up from sandy raud attached to Avicula {Meleagrinee, 

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



Chamą pellucida. Chamą testu albd roseo seu rubro fucatd vel 

 strigatd, lamellis f requentibus, frondibus elongatis pellucidis ; in- 

 tus albd, limbo crenulato. 



Hab. ad Peruviam. (Iquiqui.) 



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 low water mark. 



lu old specimens the foliations and lamellce are completely worn 

 dovvn, and the shell has soraewhat of a crystalline appearance ; — 

 indeed it is always semitransparent. 



Chamą lobata. Chamą testd albd, lobatd, subrhomboidęd, radi- 

 atim striatd, lamellis creherrimis, fimįriatis, foliacęis, striatis j 

 limbo interno crenato. 

 Hab. ad Insulam Nevis. 



Fouijd 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. 



Chamą Pacifica. Chamą testd 7'ubr d purpured vel luted, lamellis 

 creberrimis, foliis seu squamuUs brevioribus interdum albidis ; 

 limbo interno creuato. 



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 ■vvith Lamarck's Chamą įiorida, 

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

 gin of Chamą Pacifica is strongly crenated. 



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

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

 Many shells of this species \vere brought to this country some yeai^s 

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



Chamą imbricata. Chamą testd lamellosd, squamis imbricatd, al- 

 bidd ptirpureo-fusco varid ; valvd superiore subde2)rcssd, sublo- 

 batd, sitiu ab umbone u$que ad limbum currente ; intūs albidd, 

 limbo integro, supissime nigro-purpureo. 

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

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

 to Aviculee, at a depth ranging from three to seven fathoms. Tliere 

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

 vai ve. 



This species was also brought home in considerable numbers by 

 Mr. Samuel Stutchbury from the Pearl Islands. 



