260 A MANUAL OF AMERICAN LAND SHELLS. 



Patula perspectiva, Say. 



Shell broadly and perspectively umbilicated, orbicular, scarcely con- 

 fk; 270. y(^x above, excavated below, Ibin, reddish horn -color, regu- 

 larly ribbed ; whorls C^, gradually increasing ; aperture small, 

 lunately subciicular, within furnished with a single, subprom- 

 inent tooth on the base of the shell ; peristome simjjle, acute, 

 its extremities separated widely. Greater diameter 8, lesser 

 7i-"'" ; height, 3"^"^ 



Helix perspecHva, Say, Journ. Phila. Acad., i, 18 (1817); Nich. Encycl., iv, ed. 3 

 (1819); Binxey's ed., 9.— Binney, Bost. Jouru. Nat. Hist., iii, 430, pi. xxi, 

 tig. 4 (1840); Terr. Moll., ii, 2^6, pL xxx, fig. 1.— De Kay, N. Y. Moll., 

 42, pi. iii, fig. 38 ( 1843).— Fekussac, Tab. Syst., 44; Hist. Nat. desMoll., pi. 

 Ixxix, fig. 7.— Deshayes, in Lam., viii, 130; ed. 3, iii, 315; in Fl^R., i, 81. — 

 Chemnitz, ed. 2, ii, 114, tab. Ixxxv, figs. 30, 32.— Pfeiffer, Men. Hel. Viv., 

 i, 103; iii, 99 (excl. if. ^/io/a).— Reeve, Cpn. Icon., 695.— W. G. Binney, 

 Terr. Moll., iv, 122.— Leidy, T. M. U. S., i, 453, pi. vii, figs. 4-7 (1851), anat- 

 — W. G. Binxey, L. &Pr.-W. Sb., i, 79, fig. 139 (1869). 



Eelix patula, Deshayes, Encycl. M6tb., ii, 217 (1830). 



An(jiii^'pUa pirnpectiva, Trvon, Am. Journ. Concb., ii, 262 (1866). 



I'atula pnspeciivn, W. G. Binney, Terr. Moll., v, 164. 



A Post-Pliocene species. jSTorth of Maryland it is not now found east 

 of the Appalachian chain, but elsewhere is probably found over the 

 whole of the Eastern Province. I have received it from Texas. 



Animal: Head and eye-peduucles bluish-black, margin and posterior 

 l)art of foot white. Foot transparent, narrow, less in length than 

 twice the diameter of the shell, terminating acutely. 



The jaw and lingual membrane are quite like those of F. striatella. 

 The ends of the jaw, however, are more squarely truncated, and the 

 striae are not converging. 



Lingual membrane (Terr. Moll., V, Plate IV, Fig. A) 15-1-15 teeth, 

 7 perfect laterals. 



The genitalia are figured by Leidy (Terr. Moll., I, Plate YII Figs. 

 4-7). The same general arrangement is found as in alternata but 

 all the organs are more elongated ; the duct of the genital bladder 

 is very long and thread-like. 



A strongly carinated form is found in Union Count}', Tennessee. 



Patula Bryanti, Harper. 



Shell broadly and perspectively umbilicate, discoidal, nearly fiat 

 above, deeply excavated below 5 whorls 5, gradually increasing, regu- 

 larly ribbed, outer whorl bicarinate; color light-brown ; aperture small. 



