AND OTHER FAMILFES. 77 



like that species, curve towards the cavity of the beaks ; it stretches in 

 a point towards the centre of the cavity of the disk. In general out- 

 line it resembles the An. rutagonia (Lam.), but differs in being less 

 rotund, less inflated, and in the nacre being white. 



Anodonta Blainvilliana. Plate XII. fis. 35 



t3' 



Testa ovatd, injlatd, vulde insequilatcrali, ant'ice angulatci, postice lulissima, 

 ad marginem anteriorem hiunti; cicatrice marginali lata et postice valde incurva; 

 valviilis subcrassis ; natibiis jjromiimUs ; margine dorsali rectd; margnritd snl- 

 monis colore tinctd. 



Shell ovate, inflated, very inequilateral, angular before, very wide posteriorly, gaping 

 at the anterior and posterior margins; palJeal cicatrix broad and much incurved poste- 

 riorly; valves rather thick ; beaks somewhat prominent; dorsal line straight; nacre 

 salmon and pearly. 



Hab. Chili ? 



My Cabinet. 

 Diam. 1-3, Length 1-9, Breadth 3 inches. 



Shell ovate, inflated, very inequilateral, angular before, very wide 

 posteriorly, the greatest length being perpendicular from the extreme 

 posterior end of the ligament to the basal margin, gaping much at the 

 anterior margin, and rather less at the posterior margin ; substance of 

 the shell somewhat thick ; beaks rather prominent; dorsal line straight, 

 having a slight elevation under the beak like an incipient tooth ; ante- 

 rior cicatrices complicated but distinct ; posterior cicatrices wide and 

 confluent; dorsal cicatrices numerous and stretched in a line across the 

 cavity of the beaks ; marginal cicatrix wide, deep and much incurved 

 near to the posterior cicatrix; nacre salmon, beautifully pearly and iri- 

 descent. 



Remarks. — I accidentally met with this interesting shell at a shop 



in Havre last October, a few days previously to my embarkation. The 



two valves belong to different individuals, but they very nearly match. 



They have both been slightly mutilated by an attempt to beautify 



VOL. V. — u 



