PACIFIC COAST SPECIES. 159 



Succiiioa rusticana, Gould. 



Shell elongate, ovate-coiiical, rather large, thin and fragile, pale 

 greenish horn-color, surface rude and without Inster, fig 144. 

 coarsely and irregularly marked by the lines of growth; 

 spire acute, of 3 or more moderately convex whorls, sepa- 

 rated by a well-impressed suture, the last whorl large 

 and long, narrowing towards the base; body portion of s: msticana. 

 the face of the shell moderately large; aperture ovate, three- fourths 

 the length of the shell ; fold of the columella distinct. Length of axis, 

 12i"'>"; breadth Ci""". 



Siicciiiea runlicana, Gould, Proc. Bost. Soc. Nat. Hist., ii, 187 (Dec, 184(i); Mollnsca 

 of Expl. Expcd., 28, fig. 21) (18r)2^. — Pkeiffkr, Moii. Hel. Viv., ii, r)23.— W. 

 G. BiNXEY.TeiT. Moll.,iv,G, pi. Ixxix, fig. 14 ; L. & Fr.-W. Sh., i,269 (I8(;i)) ; 

 Terr. Moll., v, 427.— Tryon, Am. Journ. Condi., ii, 263 (18(i6). 



Oregon to Tulare Valley, California; White Pine, Nev. ; thus be- 

 longing to both Central and Pacific Provinces. 



For a figure of the animal see generic description of Succinea (below). 

 Jaw, lingual dentition, and genitalia unknown. 



Succinea IViittalliaiia, Lea. 



Shell lanceolate-ovate, thin and fragile of a dull horn-color, some- 

 what rudely undulated by the lines of growth; composed of fig- i45. 

 about 3 tumid whorls, forming a conical spire, the last whorl /Q 

 constithting nearly the whole shell; suture well marked; 

 aperture nearly two-thirds the length of the shell, ovate, 



-1 1 • /. • Succinea 



broadly rounded m front, the posterior angle being also Nuttaiuana. 

 somewhat rounded by the abrupt curvature of the peristome; columella 

 very gentlj' curved, the region being somewhat gibbous; no fold on 

 the columella, but in the region of the spire it is slightly sinuous. 

 Length 13, of aperture 10""". 



Sttcciuca XuitaUudia, Lea, Proc. Aui. Phil. Soc, ii,32 (1841); Trans., ix,4; Ob>s., iv, 4 

 (1844).— PfEiffek, Mou. Hel. Viv., ii, .'J23.— Binxey, Terr. Moll., ii, bl, pi, 

 Ixvii, a, fig. 4.— W. G. Binxey, Terr. Moll., iv,6; L. & Fr.-AV. Sh., i, 269 

 (1869); Terr. Moll., v, 428.— Tryon, Am. Jomu. Coucli., ii, 236(1866). 



Oregon and California, in the Pacific Province. 



Jaw as usual ; no anterior ribs. 



The lingual membrane has 19-1-19 teeth (Terr. Moll., Y, Plate XVT, 

 Fig. Ii). Another lingual membrane had 50 rows of 30-1-30 tei th ; 

 centrals obtusely tricuspid ; laterals bicuspid ; marginals tridentate, 

 the inner tooth much the largest. 



