80 new-york fauna — mollusca. 



Physa glabra. 



PLATE V. FIG. 88. 



(STATE COLLECTION.) 



Description. Shell sinistral, smooth, shining, elongated, with five to six volutions : suture 

 impressed : spire elongated into an acute apex. Body-whorl more than half of the total 

 length. Aperture oblong, acute above, rounded beneath, and half of the total length. 

 Columella sinuous, slightly reverted, with a faint oblique fold. 



Color. Deep brownish orange, approaching to copper. 



Length, 0"4; of aperture, 0"2. 



This shell, for which I am indebted to Dr. Budd, who obtained it from Lake Champlain, 

 appears in some collections under the name of P. aurea, which it resembles in nothing but 

 color. It approaches P. elongata, but differs in its impressed suture and the form of its 

 columella. 



Physa aurea. 



PLATE V. FIG. 89. a. b. 

 (STATE COLLECTION.) 



Physa aurea. Lea, Trans. Arm Phil. Soc. Vol. 6, pi. 23, fig. 106. 



Description. Shell sinistral, fragile, polished. Whorls four to five : suture very slightly 

 impressed. Body-whorl longitudinally striate. Aperture moderate, four-tenths of an inch 

 long. Lip thickened near the columella, and slightly folded near the umbilical region. 



Color. Amber, varying to olivaceous and reddish brown. 



Length, 0-6; diameter of aperture, - 4 nearly. 



These were obtained from West-Point, and were found diminishing in size to the length of 

 three-tenths of an inch. Mr. Lea has described it as " sinistral, rather inflated, pellucid, 

 shining ; spire rather short ; whorls four ; outer lip margined ; aperture somewhat inflated. 

 Color, golden. Height, 0"5; diameter, 0.3. Hot Springs, Virginia." I had described 

 it in my notes as P . fragilis, but have concluded to arrange it here provisionally. It may be 

 distinguished from gyrina and elongata, by the number of whorls, and proportional length 

 of the aperture. 



