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ACADEMY OF SCIENCES. 19 
wedge-shaped. Color dark brown, tentacles darker. Surface thickly studded 
with paler tubercles very regularly arranged in front, less so behind the shell. 
A deep furrow at upper edge of foot, which spreads to twice the width of 
the body, forming a sharp edge all around. Head obtusely rounded, tentacles 
long and slender. 
It resembles that of H. Traskii most nearly, differing much from the others 
nearest allied in their shells. 
A remarkably flat variety of H. fidelis, found by Mr. Harford at Dalles, 
Oregon, is so much like forms of this species as to suggest that they are of a 
common origin. If the animal proves to be intermediate in colors, it will 
show that they are only varieties of one species, but so far as known, the 
animals are more distinct than usual in shells no nearly allied. 
H. Traskii Newe. Specimens from near San Buenaventura, where it 
abounds in moist bottom lands, have the young shell bristly up to the growth 
of four whorls, but the adult shows no trace of this. The animal has the 
form of that of var. Diabloensis (figured in Proc. Phil. Acad. 1872), but differs 
in paler purplish (not slaty) tint, and tubercles tipped with white, probably 
only a more southern variation. The young shell is also distinctly subangled, 
though not always to the same degree, some being far flatter above than others. 
Out of over fifty adult shells, one measures 1.30 by 0.60 inch, looking like a 
pale H. fidelis, with but 644 whorls. I found them to bein the habit of 
climbing small willow trees in a swamp up to a height of 12 feet. 
Dr. Yates has found var. Diabloensis in Colusa Co., 100 miles north of Mt. 
Diablo, near Cache Creek, the outlet of Clear Lake, inhabiting only the 
eastern ridges of the coast ranges as farther south. Also near Calistoga, Napa 
County. The supposed hybrid mentioned by me in these Proceedings, III, 
331, is the type of this form. 
H. fidelis var. infumata Gld. In a former article, I have stated that 
specimens from Humboldt Bay are intermediate between the northern and 
southern shells; also suggesting that the latter might sometimes show the 
normal bands of the group. I have verified this suggestion by finding a 
young faded specimen two miles east of Oakland, in which the darker band 
is quite distinct just above the angle, on several upper whorls, the light 
marginal ‘‘ fillets ’’ also showing above and below it. This specimen is also 
roughly ribbed and clouded above, exactly as in H. lapicida for which it might 
be taken if found in Europe. 
Tt will be observed from the description of the colors of the animal here 
given, that they resemble those of /fidelis. All the species analogous to 
** Campylea’’ differ much more in animals, as well as in shells, than the 
** Arionta’’ group. This is connected with their extensive range in latitude, 
while the latter are limited to more constricted circles, as shown in the article 
on the ‘‘ Law of Variation.” 
The animal is black, with brick-red tubercles, conspicuous even to the end 
of the tentacles, the furrows of the back not quite symmetrical, except one 
on each side of the median dorsal line. Mantle edge smoky gray. Length 
twice the diameter of shell; height of body half the breadth of foot. Form 
and tentacles more slender than in the polished species; tail sharper. The 
