318 A MANUAL OF AMllKICAX LAKD SHELLS. 



ITIcsodon profundus, Say. 



Shell broadly umbilicated, orbicularly' depressed ; epidermis yellowish 

 Fig. 342. horn-color, with reddish brown revolving Ihies and 



bands, sometimes uuiformly'brown oralbino ; whorls 

 from 5 to G, convex, obliquely striated with delicate 

 and regular raised striie; suture distinct; aperture 

 21. profundus. aluiost circular, a little contracted by the peristome, 



flattened towards the plane of the base; peristome wliite, thickened, 

 reflected, with a slightly prominent callus or obtuse tooth on the inner 

 edge near the base ; umbilicus rather large and prolbund, exhibiting all 

 the volutions to the apex; base convex, with the stria? converging into 

 the umbilicus. Greater diameter 29, lesser 24"""; height, 14""". 



Hetixjirofunda, S\Y, Jonrn. Pbila. Acad., ii, IfiO (1821); American Conchology, No. 

 4, pi. xxxvii, fig. 3; ed. Binnky, 20, 36, pi. xxsvii, lig. 3; ed. Chenu, iii, 51, 

 pi. xiii, fig. 2, b, 2, c.—Bk Kav.N. Y. Moll., 42, pi. iii, fig. 3.— Lkidy,T. M. 

 U. S., i, 25.^), pi. ix. figs. 1-3, anat. — Bi>;xky, Best. Jomn. Nat. Hist., iii, 3T7. 

 pi. XV ; Terr. Moll., ii, 177, pi. xxii. — Pfeiffeh, Mon. Hcl. Viv.,i, 382; in 

 Chemnitz, ed. 2, ii, 63, pi. Ixxvii, figs. 14-16.— Dkshayes in Fer., i, G'J.— Mrs- 

 Gray, Fig. Moll. Au,,pl. cxciii,iig. 12.— Reeve, Con. Icon., 682.— W. G. Bix- 

 NEY, Ter. Moll., iv, 70; L. & Fr.-W. Sh., i, 152 (1869). 



Eelix Richardi, Ferussac, Tab. Sy8t.,43 ; Hist., jil. Ixx, three lower figs.— Lamarck, 

 An. 8. Vert., vi. 72. — Deshayes, Eucycl. M^tb., ii, 212; in Lam., viii, 40; 

 ed. 3, iii, 283.— Ciienu, 111. Couch., pi. xii, fig. 13.— Delessert, Rec. des 

 Coq., pi. XX vi, fig. 7. 



Junior 'i Eelix bidhina, Deshayes, in F^R. Hist., i, 108, pi. Ixxxv, figs. 14-18. — Pfeif- 

 FER, Mon. Hel. Viv., iii, 201.— W. G. Binney, Terr. Moll., iv, 117, pi. Ixxix, 

 fig. 10. 



Vlosloma 2)rofnnda, Tryon, Am. .lonru. Conch., iii, 37 (1867). 



Mesodon profunda, W. G. Binney, Terr. Moll., v, 338. 



A Post Pliocene species, now found in the Interior Eegion, from 

 Western New York to Minnesota, Virginia to Kansas. Southern Appa- 

 lachians. 



Animal light brown, darker on the head, neck, eye-peduncles, and 

 tentacles, and pale on the posterior extremity ; foot rather thick, in length 

 less than twice the diameter of the shell, terminating acutely. (Sec 

 Bost. Journ. Nat. Hist., I, Plate XV.) 



Jaw arcuate, of uniform width, ends blunt; anterior surface crowded 

 with 10 stout ribs, denticulatiiig either margin. 



The lingual membrane (Terr. Moll., V, Plate VIII, Fig. Q) has 40-1- 

 40 teeth, with about 14 perfect laterals ; but the change from laterals 

 to marginals is very gradual, being made without sjjjittingof the inner 

 cutting point, which is simple on the extreme marginals even. 



Genitalia figured by Leidy (7. c). The penis sac is not very stout, 



