GLAUCONOME. 



Gray, 



TESTA oblongo-ovalis, tenuis, ventricosa, sequi- 

 valvis, insequilateralis, antice rotundata, pos- 

 tice subacuminata, epidermide viridi, tenui, 

 cornea induta: dentibus in utraque valva tribus, 

 posticis majoribus, valvae dextralis medio, 

 sinistralis postico bifidis : impressionihus mus- 

 eularibus duabus in utraque valva, antica mar- 

 ginali, oblonga; postica subquadrata: impressi- 

 one musculari pallii sinu magno, antic^ obtuso ; 

 ligamento externo oblongo. 



A BIVALVE which, according to Mr. Gray, belongs to the 

 family of the Solenaceee, inhabiting some of the great 

 rivers of the Continent of China. It was first described by 

 Mr. Gray in his Spicilegia Zoologica, he has since obtained 

 specimens with the animal preserved in spirits, and has 

 favoured us with his notes, from which we have extracted 

 the following description. 



Animal ovate, elongate, the lobes of the mantle 

 united together, leaving only a linear slit in the front of 

 " the ventral margin for the passage of the small com- 

 pressed foot : behind furnished with a very long, thick, 

 " compressed, retractile siphon, (as long as the shell when 

 contracted in spirits,) grooved along the centre of each 

 side, and slightly bifid at the end. Body oblong, ventri- 

 cose, soft, ending in a small oblong compressed foot, (as 

 long as the slit in the mantle) in front. Lips triangular, 



