THE NAUTILUS. 43 
NOTES ON THE NORTH AMERICAN SPECIES OF SUCCINEA. 
BY T. D. A. COCKERELL. 
[ Coneluded from Vol. VI, p. 31.] 
(18.) S. luteola Gould. Mr. Singley sent me this from Manatee Co., 
Florida, and at the same time specimens marked terasiana 
Pfr., from Derby, Frio Co., Texas. I made notes on these 
shells as follows: 
(a.) S. texasiana. Belongs perhaps to putris group, but very 
different from it, and forming a new subsection. Shell 
shaped, but for mouth, like some varieties of Limnwa 
palustris. Length 163 mill. Transversely irregularly 
striate-ribbed. Young example semitransparent pale 
horn, adults opaque yellowish-white. 
(b.) S. luteola. No doubt the same species as texasiana, but the 
specimens are horn-color and smaller; some little ones are 
more like putris—7} mill. long, shiny, striate, horn-color, 
more globose, spire short. 
Sect. III. Lweene. 
=Tycena Oken. 
(19.) S. avara Say. This species varies in color a good deal, and 
also in shape. The following are the varieties described or 
known to me. 
(a.) forma alba noy. - Shell greenish-white. Horseshoe Bend 
Gulch, Custer Co., Colorado, at about 10,000 ft. alt. Mr- 
H. Prime has an albino of §. avara from Arizona, and 
there is a specimen in the Binney and Bland collection 
from New York State (Dr. Lewis.) 
(b.) forma wardiana Lea. Shell yellow. 
(c.) var. vermeta Say. Yellowish, thin, suture deep. I have 
seen a clear red-brown form of this from Toronto, Can- 
ada (D. B. Cockerell). An amber-colored form was sent 
to me by Mr. Binney, collected by Mr. W.S. Teator at 
Barrytown, Duchess Co., N. Y.—this may also fall 
under vermeta. 
