196 A MANUAL OF AMERICAN LAND SHELLS. 



Family SUCCINID^. 



SUCCI]VEA. (See below.) 

 Siicciiica Ilaydeiii, W. G. Blnney. 



Shell elongate-oval, thin, shining, amber-colored ; spire short, acute ; 

 Fig. 203. whods 3, convex, the last marked with wrinkles of 



growth and irregular, heavy, spiral furrows ; suture 

 moderate ; columella covered lightly with callus, and 

 allowing all the interior whorls to be seen from below 

 to the apex ; aperture oblique, oval, five-sevenths the 

 length of the shell, the lower portion of its margin con- 

 s.Haydcni. gidcrably cxpaudcd. Length, 21'"'". ; diameter, 9 •"■". 



Sucdnea Haydeni, W. G. Binney, Proc. Acad. Nat. Sci. PMla, x, 114 (May, 18r>8); 

 Terr. Moll., iv, 40, pi. Ixxix, fig. 1; v.— Pfeiffer, Mai. Bliitt., 1859,52.— 

 Bland, Ann. N. Y.,Lyc., viii, 1G8 fig. 14 (1865).— Tkyon, Am. Jouru. Couch., 

 ii, 2:i6 (1866).— W. G. Binney, L. & Fr.-W. Sli., i, 256 (1869). 



A species of the Northern and Interior Eegions. Nebraska, between 

 the rivers Loup Fork and L'Eau qui Court ; Salt Lake City. 



Yur. 7ninor : Length, 15™"'. Found by Mr. Eobert Kennicott near 

 the Eed Eiver of the North, and at Fort Eesolution, Great Slave Lake. 



Animal of a uniform amber-color, judging from the specimens pre- 

 served in spirits in the collection of the Smithsonian Institute. 



This is the largest known American Succinea. 



Mr. Say describes IS. ovalis as showing the interior apex from the 

 base of the shell ; in other respects his description does not apply to : 

 this shell. Its aperture is nearer that of S. ovalis, Gould, not Say, but 

 the peristome is much more fiexuose, and the upper third of the shell 

 becomes gradually attenuated, so as to give a sharp-pointed appear- 

 ance, though the spire itself is short. The revolving lines are some- 

 times continuous over the whole body-whorl, but generally interrupted, 

 or confined to the interstices of the incremental striai or wrinkles. It 

 shares this peculiarity with S. Concordialis, Gould, and 8. lincata. 



Named iu honor of Dr. F. V. Hayden, the discoverer of the species. 



Jaw without anterior ribs ; lingual membrane as usual ( Terr. Moll., 

 V, 415, Plate XVI, Fig. E); teeth 35-1-35. 



