644 SUPPLEMENT. 
PLANORBIS (p. 380). 
Planorbis tumens (p. 387). 
Stearns [Proc. U.S. Nat. Mus. 1891, p. 102] has recorded this species from Phoenix, 
Arizona, at the Rio Gila, which flows into the Gulf of California. 
Planorbis caribzus (p. 387). 
Planorbis tumidus (Pfr.), Dall, Proc. U.S. Nat. Mus. xix. p. 8369 (1896) "**. 
To the localities given, add :— 
Hab. [N. Mexico :] San Bernardino and Rio Sonoyta, near the boundary-line (Jnter- 
national Boundary Commission’’*). 
Planorbis orbiculus (p. 390). 
Also occurs in the Devil’s River, Texas (W. Lloyd), according to Stearns (loc. cit.). 
Planorbis parvus (p. 394). 
Stearns [Proc. U.S. Nat. Mus. 1891, p. 104] records this species from Arizona and 
the Colorado desert, these localities to some extent bridging over the gap in the known 
distribution of P. parvus. 
Planorbis obstructus (p. 398). 
Planorbis obstructus, Pilsbry, Nautilus, xiii. p. 139 (1900) *. 
To the localities given, add :— 
Hab. S.E. Mexico: margin of the Rio Grijalva (Rovirosa ®). 
AMPULLARIA (p. 404). 
Ampullaria costaricana (p. 418). 
To the localities given, add :-— 
Hab. [S.W. Costa Rica:| Rio Coto and wooded swamps between Lapa and Rio Las 
Esquinas, Golfo Dulce (Pittier). 
Ampullaria hondurasensis (p. 420). 
Observations on the living animal and the eggs of this species are given by Tate 
in the work already cited ”. 
Add to the species of Ampullaria erroneously accredited to Mexico (p. 424) :— 
Ampullaria pallens, Philippi (in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, Ampul- 
laria, p. 52, t. 8. fig. 4): labelled at one time as Mexican in the Berlin Museum ; 
the specimen was obtained, indeed, by F. Deppe, though not in Mexico, but 
during his subsequent visit to the Philippines [see v. Martens, Malak. Blatt. 
iv. p. 184 (1858), and xii. p. 53 (1865)]. Philippi correctly surmised that it 
was from the East Indies. 
