536 MOLLUSCA. 
A. bambusearum and to some South-American forms, e. g. A. amazonensis, Lea (Obs. 
Gen. Unio, x. t. 46. fig. 300, and Sowerby’s fig. 120), from the Upper Amazons, I 
conclude that A. cylindracea also has a triangular sinulus. 
GLABARIS, Gray. 
16. Anodonta nicarague. 
Anodonta nicarague, Philippi, in Zeitsch. f. Malak. v. p. 130 (1848) ’. 
Anodonta bridgesii, Lea, Proc. Acad. Phil. 1868, p. 95 *; Journ. Acad. Phil. (2) vi. p. 290, t. 42. 
fig. 104°, =Obs. Gen. Unio, xii. p. 51, t. 42. fig. 104°; Tate, Am. Journ. of Conch. v. p. 160 
(1870) °. 
Oblong, angulated at both ends of the dorsal margin. Ventral margin rounded in the younger shell, straight 
and even a little sinuated in the old one. 
a. Long. 118; alt. vert. 64, ale 64, diam. 41 millim. Vertices in 3 long. 
b. 99 65 ; 29 37, 9 2, 29 10? 99 99 2 
a. Figure given by Lea**; 6. Measurements given by Philippi, reduced to millimetres. 
Hab. CuntraL Nicaracua: Lake of Nicaragua (Bridges?~+); Nicaragua, without 
nearer indication of locality (Largilliert 1); Rio Tipitapi (north side of the lake) 
and sand-bar north of the Rio Estar (Tate °). 
I have no doubt that Philippi’s species is the same as that of Lea: the only difficulty 
is that Philippi describes the ventral margin as equally rounded, whereas in Lea's 
figure it is straight and even a little sinuated in the middle; but such a difference is 
often to be seen between younger and old specimens of the same species in this genus, 
and it can even be traced in the lines of growth in Lea’s figure. The diameter given 
by Philippi! is very small, less than one-seventh of the length, which indicates a strongly 
compressed shell; but as he himself describes the shell as swollen (tumida), it is 
probable that some error has been made by the printer. 
17. Anodonta jewetti. 
Anodonta jewettiana, Lea, Proc. Acad. Phil. 1868, p. 95°. 
Anodonta jewettii, Lea, Journ. Acad. Phil. (2) vi. p. 289’,=Obs. Gen. Unio, xii. p. 49, t. 41. 
fig. 101°; Clessin, in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Anodonta, P. 135, t. 44. 
figg. 1, 9! * (copied from Lea). 
Near in form to A. ciconia, but more swollen, the summits comparatively less advanced, and the fore side not 
gaping. 
Hab COnwrrat Nicaragua: Lake of Nicaragua (Bridges '-3), 
A. areolata, Sowerby (Reeve, Conch. Icon. xvii., Anodon, t. 10. fig. 28), locality 
unknown, seems to be very near this species. 
PsEUDOLEILA, Fisch. & Crosse. 
18. Anodonta ciconia. (Tab. XLI. fig. 4.) 
Anodon sinuosus, Swainson, Exotic Conch. t. 16 (1841) * (nee Anodonta sinuosa, Lam., 1819). 
Anodonta ciconia, A. Gould, Proc. Bost. Soc. Nat. Hist. iv. p. 92 (1851) *; Carpenter, Catal. of 
