ERYCINA. 



Lam. Annales du jNhiseum, VI. p. 413. 



^ ^1 



TESTA transversa, plerumque ina^quiiatera, 

 u^quivalvis. Denies^ ultcrius valvce^ duo Cardi- 

 7iales, inaeqiiales, divaricati, cum foveolS, liga- 

 ment i intermedia; duo lateralesy oblonjj;i, com- 

 pressi, breves, approximati; alterius valves^ 

 cardinaJcs ant niilli, autobsoleti; lateral es duo y 

 alter obiongus, compressus ; alter brevis crassus. 

 Imprf'ssiones inuscularcs dua3, laterales. Sinus 

 inipressionis pallii adlia^rentis museiili parvus. 

 Lip'amentntn internum, foveolae cardinali in 

 utr?ique valva insertum. 



AVh; believe that this Genus has been scircel}^, if at ail, 

 known hitherto in England, except from the indistinct 

 figures of several fossil species, published in the Aniiales 

 du Museum, whose hinges, hovv ever, are so iii represented 

 that they do not agree with the character which Lamarck 

 g^ivcs of the Genus. We are glad, therefore^ to introduce 

 to our readers, three very distinct and well-marked 

 recent species ; we purchased two of them at the sale of 

 ^ir. Hay's collection of shells at Portsmouth, and we have 

 received a few specimens of the third in a small col- 

 lection of recent shells from Vienna, but we do not know 

 their localitv. 



Shell transverse, equivalve, g*enerally inequilateral; 

 two unequal, divaricate, cardinal teeth, with an inter- 

 mediate hollow to which the ligament is attached, and 

 two oblong^, compressed, short lateral teeth, placed near 

 to the cardinal teeth, in one valve ; in the other tlie 

 cardinal teeth do not exist, or are very obsolete, or some- 

 times one of them is united to the anterior lateral tooth, 

 which is very short, and thus increases its thickness; the 

 other lateral tooth in this valve is oblong and compressed. 

 Two lateral muscular impressions, and a very small an- 

 terior sinus in the impression of the muscle by which the 

 mantle of the animal is attached to the shell. Ligament 



