THE NAUTILUS. 59 
and have a copper-tinted nacre. U. paulus Lea and N. corvinus 
Lea are very likely the same species, but I should not place them in 
the synonomy of U. parvus as Mr. Call does. 
U. visicularis Lea, of which I have before me the two original 
Specimens on which the species was founded, is certainly not U. 
parvus. Both these specimens are dead shells, very badly eroded 
and in poor condition, but they are nearer to U. amygdalwm than 
any of the Parvus group, and probably are merely a somewhat 
heavy, light-brown variety of that species. Unio singleyanus is a 
smooth, shining, yellowish or waxy-brown shell, sometimes tinted 
and rayed with green, and very different from U. parvus. And U. 
minor seems to me to be more nearly related to U. vesicularis than 
to U. parvus, under which Mr. Cail places it. 
Unio haleianus Lea is not noticed in this revision of the Par- 
vus group, although it should undoubtedly be placed with that 
assemblage. It is the largest of the species, one of Lea’s specimens 
before me being 2 inches long by 13 high, and is nearest to U. texas- 
ensis, but is a less heavy species. 
NOTES AND NEWS. 
Mexican LAanp SHEtrs.—Professor T. D. A. Cockerell has sent 
to me a few land shells collected at San Rafael, Jicaltepec, Vera 
Cruz, by Professor C. H. T. Townsend. The species are: 
Helicina flavida Mke. Wonderfully variable in color. Some are 
uniform yellow with red apex; others uniform reddish; others 
whitish with the spire red, or whitish below, red above, while some 
specimens are girt with a reddish band above the periphery, on a 
whitish ground. The size also varies considerably. 
Glandina? A species of the decussatus group, not adult. 
Volutaxis similaris Strebel. Somewhat larger than the type, alt. 
7 mm. 
Praticolella griseola Pfr. 
Praticolella ampla Pfr. This Helix looks a good deal like simi- 
laris Fér. 
Bulimulus sulphureus Pfr. Besides the ordinary unicolored form, 
there is one example with five reddish bands, the umbilical and basal 
continuous, those above interrupted into squarish spots at irregular 
intervals. This color-form has not before been noticed.—H. A. P. 
