ANODONTITES 1 44 1 



Group of Anodontites trigoniis. 



Shell long, elliptical, solid, inflated, produced at posterior 

 base, with a smooth, shining epidermis ; nacre very brig-ht. 



Anodontites trigonus (Spix). 



Shell somewhat pentagonal, solid, subinflated, inequilateral ; 

 beaks moderately elevated ; hinge line slightly arched ; anterior 

 end narrowed, rounded or subtruncate ; posterior ridge well 

 developed, rounded, ending in a blunt point about on the me- 

 dian line ; dorsal slope obliquely truncate ; base produced about 

 at the middle where it is subangulate : epidermis pale to dark 

 olive, somewhat sericeous, showing dark rest marks ; nacre blu- 

 ish, iridescent ; muscle scars well marked. 



I^ength 48, height 30, diam. 20 mm. 



Brazil ; Ecuador ; Peru ; Bolivia. 

 Anodon trigGniis Spix, Test. Fluv. Bras., 1827, p. 29, pi. xxii, 



fig. 2. 

 Margarita (Anodonta) trigona Lea, Syn., 1836, p. 51 ; 1838, 



p. 30. 

 Anodon trigona Cati.ow and Reeve, Conch. Nom., 1845, p. 68. 

 Anodonta trigona Hanlev, Test. Moll., 1842, p. 218. — Kus- 



TER, Conch. Cab. Ano., 1853, p. 9, pi. 11, fig. 5. 

 Margaron (Anodonta) trigona Lea. Syn., 1852, p. 50; 1870, 



P- 75- 

 Giaharis trigonus Simpson, Syn., 1900, p. 928. 

 Anodon chiquetana d'ORBiGNY, Guer. Mag., 1835, p. 41. 

 Anodonta chiquetana P.^Tet,, Conch. Sam., III. 1890, p. 177. 

 Anodonta castchiaudi Hupe, Moll. Nouv., ITI, 1857, p. 88, pi. 



xviii, fig. 4. 

 Anodonta subrostrata Philippi, Mai. Bl., XV'I, 1869, P- 39-"~ 



Pfeiffer, Nov. Conch., Ill, i86<), p. 486, pi. cv. figs. 1-3. 

 Anodonta iicoyalensis Phii,ippi, Mai. Bl., XV^I, 1869, P- 40- — 



Pfeiffer, Nov. Conch., Ill, 1869, P- 4^6, pi. cv, figs. 4-6. 



There is a shell in the Lea Collection bearing the name Ano- 

 donta trigona Spix, that is a little higher in proportion to 

 length, and lighter colored than the figure of A. trigonus ijiven 



