LYMN-EIDZ OF NORTH AMERICA. 167 
Length. Breadth. Aperture length. Breadth. 
21.50 12.00 14.00 7.00 mill. Type columella 
19.00 12.00 14.50 8.50 “ Type macrostoma 
16.00 8.50 11.40 6.00 “ Chicago. 
14.00 Tate 9.50 A) os 
21.00 11.00 15.50 9.50 “ Washington, D. C. 
13.00 7.00 9.00 EEO) w - 
10.00 6.50 7.00 ALE) Manatee Co., Fla. 
19.00 11.00 14.00 8.00 “ Concord, Tenn. 
12.00 7.50 9.00 6.00 “ Pass Christian, Miss. 
20.50 12.00 15.00 9.00 “ Branford, Conn. 
14.00 8.00 10.00 G50 ce - 
Types: Columella Say, Academy of Natural Sciences, Philadel- 
phia, three specimens, No. 58791; columellaris C. B. Adams, Amherst 
College ; navicula Val., location unknown; Succinea pellucida Lea, eight 
specimens, No. 117913, and Succinea wilsoni Lea, one specimen, No. 
121066, Smithsonian Institution; macrostoma Say, Academy of Nat- 
ural Sciences, Philadelphia, three specimens, No. 58582; acuminata 
C. B. Adams, Amherst College. 
Type Locarity: Columella Say, type locality not mentioned by 
Say (probably near Philadelphia); macrostoma Say, Cayuga Lake, 
N. Y.; acuminata Adams, New Bedford, Mass.; navicula Val., Phila- 
delphia, Penn; Succinea wilsoni, Darien, Ga.; Succinea pellucida, type 
locality not given. 
AntmAL: Almost transparent, with a short, wide foot, bluntly 
rounded behind; head separated from foot by a constriction; tentacles 
short, thick, triangular, transparent; color dirty white, darker on the 
body, which is covered with white spots, seen through the transparent 
shell; edge of mantle transparent; head above lilac-tinted; the head 
is not much in advance of the edge of the shell when the animal is 
in motion; the animal appears much too large for the shell. Length 
of foot,.8.00; width, 5.50 mill. 
Jaws: Median jaw wide and low, arched, about three times as 
wide as high; lower margin with a wide, bluntly rounded median 
prof@ction. (Pl. VI, fig. C.) 
RapuLa: Formuta (plate VII, fig. B): $3424401111091 2123 
(35-1-35) ; central tooth with a wide reflection, the cutting point 
broadly spade-shaped ; lateral teeth with a quadrate base of attachment; 
reflection rather wide, reaching below the base of attachment, tricuspid, 
the mesocone the largest; all cusps wide and spade-shaped; the second 
lateral has the entocone nearer the distal extremity, the ectocone be- 
coming higher on the reflected portion; the eleventh and twelfth teeth 
are modified and connect the lateral with the marginal teeth, a second 
