116 A MANUAL OF AMEBIC AN LAND SHELLS. 



striction of the whorl directly bobiiid it ; ou the base of the shell is an 

 internal, transverse tubercle. Greater diameter, 6""'"; height, 3^«"". 



Selix loricata, Gould, Troc. Bost. Soc. Nat. Hist., ii, 165 (1846); Moll. Expl. Exped., 



68, fig. 39, a,i,c.; T.M. U. S., ii, 145, pi. xxix, a, fig. 1.— Pfeiffek, Mon. 



Hel, Viv., i, 416.— W. G. Binney, Terr. Moll., iv,ll ; L. & Fr.-W. Sb., i, 134 



(1869). 

 Eelix Leconiii, Lea, Traus. Am. Pliil. Soc, x, 303, pi. xxx, fig. 13; Obs., v, 59 



(1853).— Pfeiffer, formerly, Mou. Hel. Viv., iii, 265. 

 Triodopsis loricata, TuYON, Am. Jouin. Conch., iii, 54 (1867).— W. G. Binney, Terr. 



Moll., V, 313. 



California, near San Francisco and El Dorado County to Klamath 

 County, and even to Mariposa County. Both in Coast Eange and 

 Sierra Nevada counties. A species of California Eegion. 



Its general form and its aperture are very much like T. inflecta, Say, 

 though it is a much smaller shell and the teeth of the aperture are 

 less developed. Its peculiar surface, resembling a scaly coat of mail 

 when closely examined, is highly characteristic. 



Jaw long, broad, slightly. arched, ends blunt but little attenuated, 

 with 11 broad, stout, crowded ribs, visible on both anterior and poste- 

 rior surface, and crenulating either margin. 



T. loricata (Terr. Moll., V, Plate YII. Fig. J) has over 20-1-20 teeth 

 on its lingual membrane; 8 perfect laterals. 



Genitalia not observed. 



JWESODOJV. (See below.) 



ITIcsodon Coluiiibianus, Lea. 



Shell umbilicated, subdepressed-globose ; epidermis with short, rigid 

 Fig. 84.* hairs; corneous, thin; whorls 6, slightly rounded, very 

 minutely striated, rising gradually but regularly, one 

 above the other, to an acuminated apex ; suture strongly 

 M. Coiumbianus. impressed ; aperture roundly lunate, a little contracted and 

 thickened by a testaceous deposit or border at the angle of reflection of 

 the peristome ; peristome thickened, whitish or brownish white, reflected 

 but not flattened, rather grooved on its face, the basal margin horizon- 

 tal in its direction, with a slight thickening or jn-ojection before it 

 reaches the base of the shell ; umbilicus open, partially hidden by the 

 reflected peristome at its junction w ith the base ; base a little flattened. 

 Greater diameter 17, lesser 14""" ; height, 11™"^. 



* The hirsute epidermis ig not eljowii in the figure, 



