PACIFIC COAST SPECIES. 



145 



Genitalia as in A. Nickliniana. The flagellate ends of the vaginal 

 prostate are shorter in this species. 



This species is nearly allied to, if not identical with, A. TrasM. It 

 is, however, a more delicate shell, which is readily distinguished from 

 the typical TrasM. 



Arionta Diipetithouarsi, Deshayes. 



Shell umbilicated, orbicularly convex, smooth or substriate, dark 

 chestnut, lighter above, with a dark-red, white- 

 margined band ; spire obtusely conoid ; whorls 7 

 to S, narrow, rather convex, the last inflated ; ap- 

 erture ovate-semilunar, white, and banded within ; 

 peristome simple, narrowly reflected, its columellar 

 end arched, dilated and arched above, not cover- a Dupctdhuuan,, 

 in g the moderate umbilicus. Greater diameter 29, lesser 25"" " ; height, 

 17""". 



Helu Dupetithouarsn, Deshayes, Rev. Zool., 1839, 360; in Guerin, Mag., 1841, tab. 

 XXX ; in Fer., i, 169, pi. xcvii, figs. 8-10. — Pfeiffer. Mon. Hel. Viv., i. 338, 

 excl. var. ; iii, 229 ; in Chemnitz, ed. 2, 1, 328, pi. Iviii, figs. G, 7 (not pi. Ivi, 

 figs. 3-5).— Reeve. Con. Icon., 659.— Gould, Terr. Moll., iii, 14.— W. G. Bik- 

 NEY, Terr. Moll., iv, 1.5, pi. Ixxvi, fig. 9; Pac. R. R. Rep., vi, 114 (1857); L. 

 &. Fr-W. Sh., i, 174 (1S69). 



Helix Oregommsis, Lea, Trans. Am. Philo. Soc, vi, 100 (1839) ; Obs., ii, 100, pi. xxviii, 

 tig. 9; Troschel, Arch. f. Nat., 1839, ii, 221.— De Kay, N. Y. Moll., 46.- 

 Peeiffer, formerly, Mon. Hel. Viv., i, 428. ■ 



Aglaja Dttpeiithouarsi, Tryon, Am. .Jouru. Couch., ii, 315 (1866). 



Ai-ionia Dupetithouarsi, W. G. Binney, Terr. Moll., v, 370. 



A species of the California Province, only found at Monterey, Cal. 



Animal light slate-color or dirty white. 



Jaw as usual in the genus ; 4 ribs. 



Lingual dentition (Terr. Moll., Y, Plate IX, Fig. E) as usual. Teeth 

 50-1-50. The centrals and first laterals have no 

 decided side cusps and no decided side cutting 

 points, but the latter is represented by a lateral 

 bulging on the large cutting point; the distinct 

 side cusp and cutting point appear on the ninth 

 tooth. There are about 19 laterals, the twentieth 

 tooth having its inner cutting point bifid. The 

 marginals are as usual in the genus. 



The genitalia are like those of sequoicola. The \ 

 penis sac is, however, more slender. There does -^z-^^*,; 

 not api^ear any retractor muscle of the penis sac. 

 The oviduct is greatly convoluted. 

 1749— Bull. 28 10 



Fig. 125. 



A. Dvpetithovarsi. 



