368 



TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Fig. 249. 



aequoicola. 



body-whorl, between two equal bands of white ; surface but slightly ruughened 

 by coarse, irregular wrinkles of growth, often decussated with coar.<? indented 

 revolving lines, the upper whorls with prominent, 

 crowded, minute, isolated granulations, running in 

 ridges or series in an oblique direction to the wrin- 

 kles of growth ; spire obtusely conic ; whorls 6, but 

 slightly convex, the last more globose, slightly de- 

 scending before ; umbilicus moderate, conical ; aper- 

 ture very oblique, subcircular ; peristome white, thick- 

 ened, ends approaching, its columellar portion wi- 

 dened and reflected, partially covering the umbilicus. 

 Greater diameter 27, lesser 21 mill. ; height, 12 mill. 



Helix sequoicola, J. G. Cooper, Proc. Cal. Acad., III. 



259 (1866). — W. G. Binnet, L. & Fr.-W. Sh., I. 



172, Fig. 300 (1869). 

 Aglaja sequoicola, Tryon, Am. Journ. Conch., III. 



160, PI. XI. Fig. 27 (1867). 



In the California Region, from Santa Cruz County, California, twenty miles 

 north. 



Animal dark bluish-slate. Epiphragm as usual in the genus. 



In form and coloring much allied to Mormonum, but readily distinguished by 

 its peculiar sculpturing. It may be hirsute when in a perfect condition. 



The shell described and figured was received from Dr. Cooper. 



Jaw as usual ; 4 to 6 ribs. 



Lingual membrane (PI. IX. Fig. J) with 46 — 1 — 46 teeth; 18 laterals, the 

 nineteenth tooth having a split inner cutting point. I can detect no outer cusp 

 and cutting point on any of the laterals. 



The genital system (PI. XIII. Fig. A) has the same general arrangement as 

 in Arionta Nickliniana, excepting that in the present species there is at the 

 end of the vaginal prostate a bujb-like process (x). In A. Traski, also, there is 

 a similar process, but attached to the flagellate extension at the middle of its 

 length before reaching the bifurcation. 



The extreme length of the genital system is eighty-seven millimetres. The 

 lower part of the oviduct is greatly convoluted. 



Arionta Diabloensis, J. G. Cooper. 



Shell depressed-globose, umbilicated, thin, roughened with incremental wrin- 

 kles, and regularly malleated ; reddish horn-color, the last whorl with a white- 

 margined revolving band of red ; spire but little elevated, apex obtuse ; whorls 

 6, convex, the last not descending, globose ; aperture oblique, banded within ; 

 peristome thickened, white, the columellar extremity reflected, partially cov- 

 ering the umbilicus. Greater diameter 22, lesser 1 7 mill. ; height, 9 mill. 



