ANODONTA. 099 
Anodonta, p. 213, t. 65. figg. 8, 4° (copied from Lea) ; Fisch. & Crosse, Miss. Scient. Mex., 
Moll. ii. p. 529, t. 68. figg. 1, 1a‘; Pilsbry, Proc. Acad. Phil. 1892, p. 339°. 
Anodon globosa, Sowerby, in Reeve’s Conch. Icon. xvil., Anodon, t. 35. fig. 141°. 
Very inflated, outline of the lower half nearly circular, anterior angle not very distinct ; green, some specimens 
with yellowish zones, with darker green rays, narrow and indistinct in the greater part of the shell, 
broader and more distinct on the hinder area ; sculpture of the summits, if preserved, finely waved. 
a. Long. 100; alt. vert. 73, ale 70, diam. 54 millim. Vertices in 2 long. 
& IG: ‘ 88, ,, 74, , 73 ,, 7 3g 5 
€. 4 182; ye LOG yy PY gg DS 9 ? 4, 
a. Lea’s figure ; 6. Specimen from Tlacotalpam in Strebel’s collection ; ¢. Pilsbry’s measurements °. 
Hab. BK. Mexico: Lake Concha, near Tlacotalpam, about 20 leagues south of Vera Cruz 
(Dr. C. Burrough 1-5). 
S.E. Mexico: San Juan Bautista in Tabasco (Rovirosa 5). 
10. Anodonta nopalatensis. 
Anodon nopalatensis, Sowerby, in Reeve’s Conch. Icon. xvii., Anodon, t. 16. fig. 58 (1867) °. 
Anodonta nopalatensis, Clessin, in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Anodonta, p. 223, 
t. 73. fig. 3° (copied from Reeve) ; Fisch. & Crosse, Miss. Scient. Mex., Moll. ii. p. 581°. 
Summits very broad and prominent, much advanced; ventral margin straight, even subsinuated in its middle 
part, steeply ascending before and behind; outside dark greenish-brown. 
Long. 149 ; alt. vert. 109, ale 88, diam. ? millim. Vertices in 3 long. 
Hab. KH. Mexico: Rio Nopalapa * (Nopalata) (Princep } 2). 
11. Anodonta tabascensis. 
Anodonta tabascensis, Morelet, Journ. de Conch. xxxii. p. 124 (1884) ‘; Fisch. & Crosse, Miss. 
Scient. Mex., Moll. ii. p. 580, t. 62. fig. 1°. 
Very near A. nopalatensis, but more produced before and behind; outside yellowish or reddish ; summits 
tuberculated. 
a. Long. 173; alt. vert. 122, ale ?, diam. 105 millim. 
a UT; 4 122, , ?, 5, 104 ,, 
e , 189; a 91, ,, 76, ,, ? ” Vertices in 2 long. 
a. Fischer and Crosse’s measurements of a specimen collected by Morelet; >. Morelet’s measurements ; 
c. Figure given by Fischer and Crosse *. 
Hab. SE. Mexico: swamps in the State of Tabasco (Morelet !*). 
This is perhaps only a variety of A. nopalatensis, as in Strebel’s collection, now at 
the Museum in Hamburg, there are two intermediate specimens, these approaching 
A. nopalatensis in the shape of the fore part of the shell, but not having the ventral 
margin subsinuated nor so steeply ascending behind ; it is to be regretted that no 
* Edg. Smith has been kind enough to inform me that the typical shell in the British Museum, a single 
left valve, is labelled ‘“‘ Nopalapa, leg. A. Princep.” Dr. Seler, of Berlin, who is well versed in Mexican 
geography and antiquities, tells me that Nopal-apa or Nopal-apan_ signifies Indian-fig water in the Mexican 
language, and that there are at least three localities of that name in Mener--ane on the central plateau, one 
in the State of Vera Cruz, and one in Tabasco. The second of these, situated in the district of Arayuean, in 
the southern part of the State of Vera Cruz, on the river San Juan, is probably the correct one. 
