172 THE CD ADEMY OF SCIEN< 



Limneta strigosa Binney. Check 360; Land & F. \V. Sh. X. A.. 



II, p. 35, fig. 41, 1863; Journ. de Conch., XV, p. -Tryon, Con. Hald. 



Mon., p. 89 (63), pi. 16, fig. 4, 181 



Lymnea coarctata Lea, Proc. Anier. Phil. Soc, II, p. 33, 1841 ; Trans. 

 Amer. Phil. Soc, IX, pp. 11, 12, 1S44. Obs., IV, pp. 11, 12, - 



Lymucra coarctata, YYheatley, Cat. U. S. Shells, p. 23, 1543. — Morse, 

 Amer. Xat. Ill, pi. 11, fig. 14, 1370.— Sccdder, Bull. Xat. Mus., 23, pp. 33, 200, 

 38i 



Limncea Binney, Check-list. p. 12, 1S60; Land & F. W. Sh.. X. A., 



II, p. 35, fig. 42, 1865.— Tryon, Con. Hald. Mon., p. 89 (63), pi. 16, fig. 5. 

 Sowb., Conch. Icon., XVIII, Limnaea, sp. 36, pi. X, fig. 36 b., 1872. 



Xcristoma coarctata Tryon, Amer. Journ. Conch., I, p. 249, 1865. 

 Lymncea columella Yar. coarctata, Jay, Cat., Ed. 4, p. 2* - L852 

 ~:Lymnccus columcllus Yar. a. Say, Journ. Acad. Xat. Sci. Phil., I, p. 14, 

 If 17.— Binney, Reprint, p. 65, 1858; L. & F. W. Sh. X. A., II, p. 33, 1- a 



Limncea columella Yar. casta Simpson, Proc. DaYen. Acad. Sci., V, p. 69, 

 38 



; :ell: Elongate-ovate, compressed, thin but generally not frag- 

 ile ; color light greenish to black ; sculpture as in columella ; whorls 

 - : 2, flat-sided and compressed ; body whorl occupying about four- 

 fifths of the length of the shell ; spire short, acutely pyramidal ; in 

 some specimens a channel is developed in the suture of the whorl ; 

 aperture elongate-ovate, rounded anteriorly and angled posteriorly ; it 

 is generally very effuse anteriorly and typically somewhat expanded; 

 inner lip strongly appressed to the parietal wall, where a thin, spread- 

 ing callus is developed ; the lower part of the columella is deeply exca- 

 vated and rolled upwards, permitting an anterior view of the shell 

 almost to the apex ; axis feebly gyrate, but columellar plait well marked ; 

 the umbilicus is generally tightly closed. 

 Length. 

 15.00 

 11.00 

 14.25 

 IS. 75 

 17.00 

 16.50 

 16.50 

 17.50 

 22.25 

 20.50 



Types : Chalybca Gould, 1-i specimens. X. Y. State Museum. 

 Albany, Xo. 301, Gould, Xo. A3039 ; stngosa Lea, 3 specimens, Lea. 

 Coll., Smithsonian Xo. 11864S. Lea's figured specimen measured above; 

 coarctata Lea, 3 specimens. Lea Coll.. Smithsonian Xo. 118665. Meas- 

 ured specimen is Lea's original figured example and also Binney's 

 figure 42. 



Jreadth 



. Aperture length. 



Breadth. 





8.00 



11.00 



6.00 



Mill. 



Chalybea 



7.00 



10.00 



6.00 





.. 



7.50 



9.00 



4.10 





Coarctata 



10.00 



12.25 



6.00 



•• 



Strig - 



9.00 



12.00 



7.25 



•• 



Cambridge, Mass. 



8.50 



11.00 



7.00 





.. 



8.00 



12.00 



i 



•• 



Kent, Ohio. 



10.00 



12.75 



6.50 



" 



Blount Co., Tenn. 



11.25 



15.00 



9.00 



•• 



X'ew York. 



10.00 



14.00 



8.25 



•• 





