880 Notices respecting New Books. 



ent from that of the inhabitant of free valves, to which it has been 

 denied by Nature. 



Lamarck and Barnes both mention in their description of the U. 

 alatus of Say, that M. Le Sueur thought this shell should constitute 

 a new genus. Since that time so many connate shells have come to 

 my notice, that I feel satisfied the science of conchology will be sub- 

 served by the institution of this natural genus, which will embrace, in 

 all probability, several others, viz. Hyria of Lamarck, Dipsas of Leach, 

 and Cristaria, Prisodon, and Paxyodon of Schumacher, all of which, 

 when they shall be found perfect, will most probably turn out to be 

 connate shells. Lamarck suspected his Hyria to be connate, like the 

 U. alatus ; for when describing that species, he says, " Nos Hyries 

 auraient-elles une pareille reunion a la carene de leur corselet ?" 

 Indeed the fact can scarcely be doubted. 



1. Symphynota LiEVissuiA. — Testa ovato-triangulari, incequila- 

 terali, transversim rugosa, sub-ventricosd ; valvulis tenuissimis, super ne 

 bi-alatis, ante et post nates connatisqye ; dentibus cardinalibus et late- 

 ralibus lineam curvatam facientibus ; natibus prominulis ; ligamento 

 celato ; margaritd purpurea et iridescente. 



Hab. Ohio. T. G. Lea. My cabinet. Cabinet of T. G. Lea. Ca- 

 binet of Prof. Vanuxem. Cabinet of P. H. Nicklin. Diam. 1*4 inch., 

 length from beaks to base 2'4 inches, breadth 4*5 inches, length 

 from the top of the wing to base 3-1 inches. 



2. Symphynota bi-alata. — Testa ovato-triangulari, incequilaterali, 

 transversim rugosa, sub-ventricosd ; margine dorsali bi-alata; valvulis 

 tenuibus, ante et post nates connatis ; natibus et alee posterioris basi 

 apiceque undulatis ; natibus haud prominentibus ; dente lamelliformi 

 unico in valvuld utraque ; ligamento celato; margaritd tenui et iri- 

 descente. 



Hab fresh waters of the south of Asia ? Brought from Canton 



by Captain Barr. My cabinet. Cabinet of Mr. Pierpoint. Cabinet of 

 Mr. Hyde. Cabinet of Mr. Phillips. Diam. 1 inch, length from the 

 beaks to the base 2 inches, breadth 3*G inches, length from the top 

 of wing to base 3*4 inches. 



3. Symphynota alata. — Testa ovato-triangulari, transversim ru- 

 gosa, sub-compressd ; valvulis crassiusculis, earum marginibus dorsali- 

 bus alatis, et super ligamento connatis; dente cardinali in valvulis 

 ambabus duplici, laterali in sinistra tantrum duplici, sub-curvato ; liga- 

 mento sub aid celato; natibus prominulis ; margaritd purpurea. 



Hab. our western waters. Unio alatus. Say. Nicholson's Ency- 

 clopaedia (Am. Ed.) Art. Am. Conch, pi. 4. fig. 2. Unio alata. La- 

 marck. Unio alatus. Barnes. Silliman's Am. Journ. vol. vi. Unio 

 alata. Swainson. Diam. 2, length 47, breadth 6*9 inches. 



4. Symphynota complanata. — Testa ovato-triangulari incequila- 

 terali, transversim rugosa, compressd ; valvulis crassis; margine pos- 

 teriori dorsali alata connatdque ; dente unico cardinali in valvuld 

 utraque; piano irregulari calloso sub ligamento; natibus compressis, 

 sub-prominulis ; ligamento celato ; margaritd alba, iridescenti. 



Hab. Fox River. Mr. Schoolcraft. Wisconsan. Captain Douglass. 

 Ohio. W. Cooper. My cabinet. Cabinet of Mr. Barnes. Cabinet of 



Prof. 



