^0 A MANUAL OF AMERICAN LAND SHELLS 



duct of the genital bladder enters at about its middle. The last-named 

 organ is large, globular. The penis sac is small, short, cylindrical, ex- 

 panded, and bulbous at its apex, where the vas deferens enters. I 

 could detect no accessory organs in the single specimen imperfectly 

 examined (Plate XI, Fig. F, Terr. Moll., V). The genitalia are some- 

 what of the same type as those of L.Jiavus, but the dentition of the 

 latter is quite distinct (see below among locally introduced species). 

 There is a still stronger resemblance to the genitalia of Amalia gagates 

 as figured by Semper (Phil. Archip., Pla:e XI, Fig. 9), so far as the 

 penis and genital bladder are concerned. 



Family HELICID^. 



ITIICROPIIYSA. (See below.) 



Microphysa Lansing:!, Bland. 



Shell imperforate, orbicular-depressed, shining, dark horn-colored, 

 smooth above, at the base substriate; suture impressed; whorls 5^, 

 rather convex, the last not descending, obsoletely angular at the 

 periphery, more convex at the base, excavated around the umbilical 

 region; aperture narrow, lunate; peristome acute, the right margin 

 thickened within by an obsoletely denticulated lamella, columellar mar- 

 gin scarcely reflected. Greater diameter scarcely 3, 

 Fig. 55. lesscr 2^™°^, height If""". (Bland.) 



OZonites Lansingi, Bland, Aun. Lye. Nat. Hist of N. Y. xi, 74, fig. 

 1, 2(1875). 

 Microphysa Laimngi, W. G. Binn. T. M., ^, 169. 



In damp, moist places, among leaves. Astoria, Oreg., 

 in the Oregonian Region. 



The aspect of the upper surface of the shell is very 

 like that of Z. muUidentatus. 

 The original figure is here given. 

 Micro^h^mLansingi. Mr. Bland jjlaccs the spccics in Zonites, but owing to 

 the character of the jaw, I am inclined to consider it a 

 Microphysa. One specimen of Lansingi, appearing to have the animal 

 within it, was crushed between two glass slides, enabling me, without 

 the use of potash, satisfactorily to observe the jaw and teeth remaining 

 uninjured in the tissues of the animal. 



Jaw low, wide, slightly arcuate ; ends scarcely attenuated, blunt; 

 cutting margin without median projection; anterior surface with 14 

 broad, unequal, crowded, flat ribs, slightly denticulating either margin. 



