924 PROCEEDINGS OF THE NATIONAL MUSEUM. 



*Anodonta penicillata H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 503. — • 



"PiETEL, Conch. Sam., Ill, 1890, p. 183. 

 *Anodon susannw Gray in Griffith, Cuv., XII, 1834, pi. xxiv, fig. l.i — •* Sowerby, 



Conch. Icon., XVII, 1867, pi. ix, fig. 21. 

 *Anodonta susanncti PiETEL, Conch. Sam., Ill, 1890, p. 185. 

 ^ \ Anodon ciconia Gould, Pr. Bost. Soc. Nat. Hist., IV, 1851, p. 92.'- — *?Gouli) 



and Carpenter, Pr. Zool. Soc. Lond., 1856, p. 202.— *Otia, Conch., 1862, ]>. 



213.— *Pjetel, Conch. Sam., Ill, 1890, p. 177.— *? Fischer and Crosse, 



Miss. Sci., Pt. 7, II, 1894, p. 534, pi. Lxvm, figs. 2, 2a. 

 ^Anodon hlainvilleana Sowerby, Conch. Icon., XVII, 1867, pi. vi, fig. 2. 



tGLABARIS TRAPESIALIS var. ANSERINUS Spix.' 



* Anodon anserinus Spix, Test.Fluv. Bras., 1827, p. 29, pi. xvn, figs. 1,2. — *Sowerby, 



Conch. Icon., XVII, 1870, pi. xxxi, fig. 125. 

 *Anodon anserina Catlow and Eeeve, Conch. Nom., 1845, p. 66. 

 *Margarita (Anodonta) anserina Lea, Syn., 1838, p. 31. 

 *Anodonta anserina Hanley, Test. Moll., 1842, p. 222 ; * Biv. Shells, 1843, p. 222.— 



^H. and A. Adams, Gen. Eec. Moll., II, 1857, p. 504.— *Chenu, Man., 1859, II, 



p. 146. — * Clessin, Conch. Cab. Ano., 1873, p. 80, pi. xx, fig. 1, — * P^tel, 



Conch. Sam., Ill, 1890, p. 176. 

 ^ Margaron (Anodonta) anserina Lea, Syn., 1852, p. 52; 1870, p. 83. 



tGLABARIS TRAPESIALIS var. EXOTICUS Lamarck. 



* Anodonta ea;o<icws Lamarck, An. sans Vert., VI, 1819,p. 87. — * STARK,Nat. Hist., II, 



1828,p. 89. — *Delessert, Rec. Coq. Lam. ,1841, pi. xiii,fig. 1. — *HANLEY,Test. 

 Moll., 1842, p. 217; *Biv. Shells, 1843, p. 217.— *d'Orbigny, Voy, Am. Mer., 

 1843, p. 621.— ''Chenu, 111. Conch., 1858, pi. in, fig. 2.—* von Martens^ 

 Mai. BL, XV, 1868, p. 397.- *Strobel, Mat. Mai., Pt. 1, 1874, p. 66.— *Clessin, 

 Conch. Cab. Ano., 1875, p. 178, pi. lviii, figs. 1, 2. 



*Anadon exotica Catlow and Reeve, Conch. Nom., 1845, p. 66. 



*Columl}a exotica P^tel, Couch. Sam., Ill, 1890, p. 188. 



t GLABARIS TRAPESIALIS var. SCRIPTUS Sowerby. - 



*Anodon scriptus Sowerby, Conch. Icon., XVII, 1867, pi. iv, fig. 9.^ 



* Anodon subsinuatus Sowerby, Conch. Icon., XVII, 1867, pi. vii, fig. 14. 



1 This is briefiy described in the index, p. 595, as Anodon siisannce. In the test the 

 genus is called Anodontites. 



^Two specimens of this, a large and a smaller one, are in the Gould collection. 

 Lea places the species in the Bynon-ymj of G. trapesialis Lamarck., to which Lewis 

 objects in a note on the back of Gould's label on account of its locality — Mexico. 

 After carefully comparing these shells with all our trapesialis in the Museum col- 

 lections I am unable to separate the two. Carpenter states (Mazatlan Shells, p. 117) 

 that it is found rather plentifully at Mazatlan. I do not believe that the locality 

 given for Gould's shells is correct (it is referred to Mexico with doubt by its author), 

 and have no doubt that they are from South America. The species alluded to by 

 Carpenter is probably G. glauca Valenciennes, which is closely related to G. trapesialis. 



3 Glaharis trapesialis is a very abundant, widely distributed species, and shows a 

 great number of variations. Some of these are probably worthy of varietal names, 

 others seem to be so mixed with various forms that they are scarcely worthy of any 

 designation. 



^A brownish, somewhat elongated form, much narrowed in front, receiving its 

 name from having dark purplish letter-like marks on the nacre. There is every pos- 

 sible development of this character from shells in which it is a marked feature to 

 those without it at all. 



