UNIO. 505 
: VII. Simonatas, Fisch. & Crosse. 
29. Unio cuprinus. 
Unio cuprinus, Lea, Trans. Am. Phil. Soc. iv. p. 94 (1830); Obs. Gen. Unio, i. p. 104°; Synops. 
Fam. Unionide, ed. 4, p. 61 (1870) *. 
Unio calamitarum, Morelet, Test. Noviss. i. p. 30 (1849)*; Fisch. & Crosse, Miss. Scient. Mex., 
Moll. ii. p. 612°. 
& 
Thick-shelled, compressed, unequilateral, with a very obtuse ridge descending from the summits towards the 
hinder extremity, concentrically furrowed, the furrows becoming stronger near the ventral margin ; 
reddish-brown ; beaks flat, not prominent ; inside very shining, rose-coloured, rarely almost white ; cardinal 
teeth moderately strong, triangular, furrowed ; lateral (posterior) teeth rather long, nearly straight. 
a. nephriticus. 
Unio cuprinus, Lea, loc. cit. t. 12. fig. 24°; Chenu, Illustr. Conch., Unio, t. 11. fig. 37; Sowerby, 
in Reeve’s Conch. Icon. xvi., Unio, t. 66. fig. 336 °. 
Unio calamitarum (“ nunc reniformis”’), Morelet, loc. cit.? (nec U. reniformis, F. Schmidt, Rossm. 
1836). 
Unio calamitarum, var. 6. nephritica, Fisch. & Crosse, loc. cit. p. 13”. 
Ventral margin distinctly sinuated. 
Long. 53; alt. vert. 22, ale 274, diam. 21 millim. Vertices in } long. 
29 60 ; bh 29, 39 34, 99 ? 9 99 4? 29 
Had. S.E. Mexico: in the stream Baluntie, near Palenque (Morelet °) ; Mexico, without 
nearer indication of locality (Poinsett °"). 
b. tabascoensis. 
Unio calamitarum (“ vel rhomboidea’’), Morelet, loc. cit. p. 830”. 
Unio calamitarum, var. prolongata, Fisch. & Crosse, loc. cit. p. 612, t. 63. figg. 5, 5a”. 
Unio tabascoensis, Charpentier, in Kiister, Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, p. 153, 
t. 44. fig. 3 (1856) ”. 
Unio mexicanus, coll. Paetel ™*. 
Elongated, posterior dorsal and ventral margins straight, hinder extremity almost perpendicularly truncated. 
Long. 52; alt. vert. 24, ale 26, diam. 18 millim. Vertices in + long. 
» 64; = QA gs BBy ay QQ os are 
= 89; 2 29, 5, 29, » 173 ” ” 
Hab. S.E. Mexico: Tabasco (Reip, teste Charpentier), in the stream Baluntie, near 
Palenque (Morelet '"). 
99 
HE Dl 
99 
c. persulcatus. 
? Unio metallicus, Say, New Harmony Disseminator of Useful Knowledge, 1831, p. 6”. 
Unio persulcatus, Lea, Proc. Acad. Phil. 1859, p. 155*°; Obs. Gen. Unio, vil. p. 73, t. 40. 
fig. 185 (nec Sowerby, in Reeve’s Conch. Icon.). 
Unio mexicanus, Parreyss, in Mus. Berol.*® 
Ventral margin nearly straight ; hinder extremity obliquely truncated. 
Long. 50; alt. vert. 24, ale 26, diam. 15 millim. Vertices in ? long. 
3 OLS ef 96... Si, «5 (FS 1s 3 a 8% 
Hab. Mexico, without nearer indication of locality (Hanley 
BIOL. CENTR.-AMER., Terr. and Fluviat. Mollusca, April 1900. 64 
16 17), 
