120 THE NAUTILUS. 
on rushes at an average distance of from six to eight inches from the 
bottom, adhering unusually firmly with spire uppermost on a line 
with the rush stalk. They did not seem to be in water over four 
feet deep, nor in that shallower than six inches. They clung so 
tightly to the rush that, in three instances, in the act of removing 
them the muscle attaching them to the shell was fractured, and the 
animal remained attached to the rush, leaving me with a clean shell 
in my fingers. ‘Twice the shell broke without disengaging the animal 
from his position.” 
Notes OX THE INDENTATA GROUP OF VITREA.—Referring to the 
remarks on this topic in the January Nautitus, I would note here 
that the perforated form of Vtrea indentfata from Texas is var. um- 
bilicata Singley. In ‘‘British Naturahst” April, 1893, p 81, I 
wrote: 
‘*Z. indentatus, var. umbilicatus, Singley, n. var. Mr. Singley 
has kindly sent me this from Lee county, Texas. It is the form 
figured in Man. Amer. Land Shells, fig. 17.” 
If the figure of Binney cited by me is /. rhoadst, the name um- 
biliicata must still apply to the Texan shell, as that is the only one 
Singley or I had seen. I do not remember, however, that the shell 
was much larger than usual. 
In case there is any misunderstanding as to what carolinensis is, 
I enclose a note giving my original description, not published hith- 
erto in full in THe Navtitus: 
Vitrea carolinensis, (Ckll). The original type was thus described : 
Max. diam. 10, alt. 5 mm., whorls 5. Pale horn, shiny, semi- 
transparent, umbilical region somewhat whitened. Surface of shell 
with strong transverse growth lines and distinct transverse grooved 
lines. The grooved lines are about 26 on body whorl. Umbilicus 
small, narrow. Aperture obliquely large-lunate, the upper angle 
much smaller than the lower. Peristome not sinuate. 
Vitrea sculptilis (specimen from W. G. Binney). Max. diam. ro, 
alt. 5 mm. Impressed strizee very numerous ; go or more on body 
whorl. Peristome sinuous, reflected so as to nearly cover umbilicus. 
Aperture narrower. 
These were originally sent to me by Mr. Binney as ‘* two forms” 
of sculpilis He afterwards agreed that they were distinct, and 
that the form referred to scu/piilis was that species. 
T. D. A. COCKERELL. 
As Potyeyra Epvarnsi Bld. seems to be a rather localiy restricted 
species, it may be of interest to record that Mr. Simpson and myself 
found it not uncommon at Elizabethton, Tenn. Polygyra iri- 
dentata complanata also occurred there. —BRYANT WALKER. 
