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 ON THE INDENTATA GROUP OF VrrREA. Referring to the 

 remarks on this topic in the January NAUTILUS, I would note here 

 that the perforated form of Vitrea indentata from Texas is var. um- 

 bilicata Singley. In "British Naturalist" 1 April, 1893, p Si, I 

 wrote : 



" Z. indentatus, var. uinbilicatus, 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 I', rhoadsi, the name um- 

 bilicata 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 carolmensis is, 

 I enclose a note giving my original description, not published hith- 

 erto in full in THE NAUTILUS : 



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. 



Vilrea sculptilis (specimen from W. G. Binney). Max. diam. 10, 

 alt. 5 mm. Impressed stria? very numerous ; 90 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 sculp/His He afterwards agreed that they were distinct, and 

 that the form referred to sculptilis was that species. 



T. D. A. COCKERELL. 



As POLYGYRA EnvARDsi Bid. seems to be a rather locally restricted 

 species, it maybe of interest to record that Mr. Simpson and myself 

 found it not uncommon at Eli/abethton, Tenn. Polygyra iri- 

 dentata comp/ana/a also occurred there. BRYANT WALKER. 



