LYMNvEIDTE OF NORTH AMERICA. 167 



Length. 



Breadth. 



Aperture length. 



Brea 



dth. 





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 



7.75 



9.50 



5.60 



" 



" 



21.00 



11.00 



15.50 



9.50 



" 



Washington, D. C. 



13.00 



7.00 



9.00 



5.50 



" 



" " 



10.00 



6.50 



7.00 



4.50 



" 



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 



6.50 



" 



" 



Types : Columella Say, Academy of Natural Sciences, Philadel- 

 phia, three specimens, No. 58791 ; columellaris C. B. Adams, Amherst 

 College ; navicula Val., location unknown ; Succinea pellncida 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 Locality : 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 zvilsoni, Darien, Ga. ; Succinea pellucida, type 

 locality not given. 



Animal : 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 

 projection. (PI. VI, fig. C.) 



Radula: Formula (plate VII, fig. B) : |^+| + V' +{+¥+!+! i' 

 (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 



