ANODONTA.—MYCETOPUS. 539 
Doubtful Central-American Species. 
Anodonta cherziana. 
Anodonta cherziana (Rang), Villa, Dispos. Syst. Conch. terr. et fluv. p. 40 (1841) *. 
Hab. Mexico, without nearer indication of locality 1. | 
The name A. cherziana is very probably an incorrect rendering of A. chaiziana 
Rang [Nouv. Ann. du Mus. d’Hist. Nat. Paris, iv. f. 28 (1835)], which has been 
found in Seneval, and not in Mexico. 
Anodonta cornea. 
Anodonta cornea, Philippi, Zeitschr. f. Malak. v. p. 180 (1848) *. 
Hab. Nicaracua (Largilliert '), 
See anted, p. 535. 
Anodonta holtonis. 
Anodonta holtonis, Lea, Proc. Acad. Phil. 1857, p. 85'; Joura. Acad. Phil. (2) iii. p. 316, t. 32. 
fig. 3] *, = Obs. Gen. Unio, vi. p. 36, t. 82. fig. 31°. 
Mentioned by Lea, Index to vols. i.-xi. of Obs. Gen. Unio, 1867, p. 20, among the 
species from Mexico and Central America; but in the descriptions themselves !~%, 
Cartago *, New Granada, Rev. J. F. Holton, are given as locality and collector. The 
shell from Rio Purificacion, a confluent of the Rio Magdalena, Colombia, figured by 
Clessin (in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, t. 50. figg. 5, 6), now in 
the Berlin Museum, differs, however, from Lea’s specimen in having the ventral 
margin sinuated and the hinder extremity blunter and bent downwards; it approaches 
nearer to the group of A. tenebricosa, Lea. 
MYCETOPUS. 
Mycetopus, d’Orbigny, Mag. Zool. 1835, p. 41; Voy. dans l’Am. mér., Moll. p. 600. 
Nearly allied to Anodonta, but distinct by the cylindrical foot of the animal, swelling and expanding into a 
disc at the fore end. Shell elongated, distinctly gaping at the anterior part of the ventral margin, as in 
Leila and in Pseudoleila, rather compressed, somewhat concentrically striated, not shining, rather thin ; no 
teeth in the hinge; sinulus triangular, but small. 
The known species are from Central or South America. 
. Alt. | Alt. : . 
Nomen. Forma. Sculptura. Color. ext. Vertices. Long. vert. | alee. Diam. Patria. 
mm. | mm. | mm. | mm. 
subsinuatus, | elongata, compressa, | levis, nitida. | virescenti- plani, 3. | 118-132 | 80-34 | 42-45; 23 | W. Guatemala. 
Sav. postice altior, marg. flava. 
ventr. ant. sub- 
sinuato. 
weddelli, elongata, antice | levis, lineis | corneo-flava, plani, 4%. 84 24 2 123 | Centr. 
Aupé. rotundata, postice| nonnullis nitida. Nicaragua. 
subrostrata. radiantibus. 
* There is a place of this name in Colombia, on the Cauca River, an affluent of the Magdalena. 
68* 
