COXCHOLOGY. 131 



f. FuUaceus group. 



Un-io foliaceus, Gould. Tavoy. Pegu. 

 Peguensis, Anthony. 



,, k.^lOlescens, GoulJ. Tavoy. 



„ PEAGiLis, G. Nev. Yaylaymaw. Upper Burma. 



Mo.vociioNDYL.EA, If Orligtuj. 



Tliis genus is readily discriminated from Unio by the teotli being- smooth and 

 tangential, not serrated and interlocking, as in that genus. In habits they resemblo 

 Unio, with which they arc associated in the hill streams. 



* ,, Salweniana, Gould. Pegu. Salwccn R. 



* „ inoscularis, Gould. Pegu. Salween 11. 



* ,, cREBitisiKiATA, Autliony. Pegu. 



J't'guerms, Ant. 

 ,, Av.i;, Theob. Mandalay. 



A single species of Conrad's genus Solenaia {S. solcniformis, B.) has been found 

 in Kachar, and may possibly be discovered in Arakan ; but the most promising ground 

 for future discoveries lies between Maulmain and Zimmay, where some species of Unio 

 occur almost rivalling in size the largest American species. 



Order SIPHOXATA. 

 Eespiratory siphons more or less well developed. 



Fumilg Chamidse. 

 CnAMA, Bruguieres. 



Shell incquivalve, fixed by one valve. Teeth two in one valve, one in the other. 

 Beaks rccuiTed, unequal. 



* ,, Lazakus, L. 



* ,, OKvrnoiDES, Chem. (non L.). 



* ,, SQUAMOSA, Chem. 



Tkibacna gigas, L. 



Shell inecjuivalve, triangular, inequilateral, ribbed, margins dentate. A single 

 primary tooth in each valve, and two lateral teeth in one valve and one in the otlier. 

 Byssal orifice large. Shell dense, and so calcified as to almost obliterate all traces 

 of organic structure (Carpenter). 



The giant clam inhabits coral reefs, and large individuals seen through the clear 

 water, through the sinuous gape of their shells, look like dark serpents. Aged 

 individuals cannot close their valves, and are said to grow to upwards of 500 lbs. 

 Their flesh is not exactly inedible, but is stinging and peppery to the taste, and 

 probably unwholesome if freely partaken of. 



Hipropus, Lamarck. 



This shell difi'crs from the last by the absence of the byssal foramen, and by its 

 double primary tooth. 



Family Cardildse. 



Foot very long and bent. Shell regular, equivalve. Hinge composed of two 

 oblique primary teeth in each valve and two elongate lamellar laterals. Ligament 

 short, external, conspicuous. 



CABDmr, Linnaus. 



* ,, RUGosuir, Lam. 



* ,, AsiAiieuM, Chem. 



* „ FIMBEIATUM, Wood. 



