PACIFIC COAST SPECIES. 



137 



A. inter cisa. 



Dr. Cooper furtber describes A. DiahJocnsis thus: Fiuely rngose-inal- 

 leate, Hues of growth often obliquely cut by delicate grooves; obscure 

 revolving ridges around umbilical region. 



Ariontn iiitei-cisa, W. G. Binxey. 



Shell globose-conic, with 5 slightly rounded whorls ; spire little ele- 

 vated ; suture distiuct; upon the body-whorl a dark re- -Fm.iu. 

 volving band, hardly discernible f aperture very oblique, 

 shape of a horseshoe ; peristome thickened, heavy, 

 dirty white, slightly reflected at the uml)ilicus, which 

 it entirely conceals, near its junction with the columella 

 furnished with a tooth-like process, the extremities con- 

 nected by a heavy ashcolored callus, which is spread more lightly 

 over the wh'ole parietal wall ; epidermis grayish-yellow, apex rufous. 

 The stride of growth are very numerous and distinct, crossed by numer- 

 ous, regular, revolving lines, so deeply impressed as to entirely sepa- 

 rate them into small sections ; thus the whole surface of the shell 

 is divided into minute, raised parallelograms, separated by the deep 

 longitudinal and horizontal furrows. Greatest diameter 22, lesser 

 19"'™; height, 15""". 



Helix intercisa, W. G. Bixney, Proc. Acad. Nat. Sci. Pliilad., 1857, 18; Proc. Bost. 



Soc. Nat. Hist., vi, 156 (1857)-; Terr. Moll., iv, 8 ; L. & Fr.-W. Sh., i,167 



(1869).— Pff.iffeu, Mon., Hel. Viv., iv, 349. 

 Helix XickHniaiia, var., Bixney, Terr. Moll., ii, I'iO ; iii, pi. vi, tig. 1 (middle tigure). 

 Eelix crebristriaUi, Newcomb, Proc. Cal. Acad. Nat. Sci., iii, 116. 

 Polijmita initrcifid, Tryox, Am. Jourii. Couch., ii, 319 (18r.7). 

 Arionfa crehrintriala, Tkyox, 1. c, ii, 317 (18G7). 

 Arionta intercisa, W. G. Binxey, Terr. Moll., v, 360. 



A species of the California Eegion, from San Clemente Island and 

 Santa Cruz Island, California. An apparently semi-fos- 

 sil form occurs, with thick shell, heavy, rough growth 

 beyond the peristome, which is made continuous by its 

 ends being joined by a very solid, raised callus. 



Jaw as usual in the genus, with 6 separated ribs. 



Lingual membrane as in other species of the genus. ^- erebHunata. 

 Teeth 31-1-31, with about 15 laterals on each side. The extreme lat- 

 erals only are bicuspid. 



Genitalia as in Eupaniplia Trijoni. 



A type oH crebrisiriata, from Dr. Xcwcouib, is figured (Fig. 115). 



From a series of specimens sent by Mr. Hemphill I am led to be- 

 lieve A. redimita a variety of inicrcim. I formerly suspected it might 

 be a variety of ramentom. Th(^ original description and figure are re- 

 peated here. 



