16 PROCEEDINGS OF THE CALIFORNIA 
The name Lysinoe proves also inapplicable to our species, being only a sub- 
stitute for Aglaia, of which the type, H. Axdouinii, is quite different. The 
Mexican species, Ghiesbreghti, adopted as typical, has been made a type of the 
new subgenus Odontura, Crosse & Fischer. 
On the whole, the most scientific plan seems to be to consider the West 
Coast banded forms as belonging to subgenera of Helix, and to include them 
under that name. There are about ten species on this slope, however, which 
seem to differ enough in the shells alone to be separated generically, besides 
Patula, Macrocyclis, Hyalina, ete., which differ both in shell and soft parts. 
Subgenus ARIONTA. 
H.ramentosa Gld. = reticulata Pf. Dr. Newcomb informs me that the 
types sent by him to both these authors were from Mission Peak, 25 m. 8. E. of 
Oakland, Cal. The former name has several months’ precedence in description, 
the latter being merely a variety of it, and both are probably varieties of 
Californiensis, with which they are connected by the subglobular form figured 
as H. Bridgesii by Binney & Bland (Pulm. Geoph. 169, f. 294). A very small 
Oakland specimen is 0.85 by 0.60 inch. Another exactly resembles the 
Monterey var. in form (vincta). 
Among the collections of the Geol. Survey of Cal. in 1860, were some 
Helices, encrusted with lime from a tufa-spring, nearly 14 inch thick, and 
supposed to be fossils. I softened the crust in dilute acid, and scaled it off 
from a perfect specimen of this species, retaining epidermis, band, etc., 
others being more or less kleached. The locality was ‘‘ Sergeant’s Ranch,”’ 
about 25 m. N. E. of Monterey (where it is replaced by the vars. vincta and 
nemorivaga). 
The form of H. arbustorum from Switzerland, called H. Repellini Charp., 
seems to represent this var. in Europe. 
Compare ‘‘ H. lutacea’’ Pf. Noy. Conch. I. 120, pl. 34 f. 1 (bandless var.?). 
H. arrosa var. Holderiana. Specimens found on the east side of San 
Francisco Bay, along the first range of hills opposite the Golden Gate, for 15 
miles N. and §., have the color and seven whorls of typical arrosa, but in 
form and sculpture approach ramentosa, being examples of the law of inferior 
development in a warmer climate, retaining characters of the young of the 
type. They measure 1.05 to 1.28 by 0.60 to 0.75 inch. The first specimen, 
found several years since by Mr. W. W. Holder, was considered a variety of 
exarata, being imperfect and faded. Dr. Newcomb identifies it as his ‘‘ var. 
of ramentosa with seven whorls,’’ mentioned in Amer. Jour. Conch., but I 
cannot yet see cause for uniting a7rosa with that series. Iam, however, less 
certain about evarata and arrosa being distinct, having found specimens exactly 
intermediate in the Coast Range 25 m.S. of San Francisco. They do not, 
however, appear to mix at Santa Cruz, where both occur, with varieties of 
Californiensis. The animal of exarata differs also in being reddish, not 
smoky-gray, more slender, with longer tentacles, foot narrower, more pointed 
behind. 
H. arvosa var. Stiversiana. A specimen obtained from Dr. Stivers, col- 
lected in Marin or Sonoma Co., has but 64% whorls, and dimensions agreeing 
with Lea’s figure of ‘‘ Nickliniana,”’ viz.: 1.05 by 0.70. It has, however, numerous 
