[TAYLOR] MARINE MOLLUSCA 85 
Dr. Dall unites À. patina with the Atlantic A. festudinalis, of Müller 
(Prodr. Zool. Dan., p. 237, 1776), but Pilsbry, and with him I agree, 
considers that as the Pacific shell is in nearly all its variations readily 
distinguishable from its Atlantic analogue, there is no good purpose to 
be served by dropping our west coast name. 
A. patina is extremely abundant in this province and very variable. 
I have collected and carefully studied many thousands of specimens and 
I am not even yet quite satisfied that we are not now erring in uniting 
forms that are specifically distinct, as we erred before by indulging in 
excessive subdivisions. 
A small deep water variety ? of patina is no larger than and has 
somewhat the shape of A. virginea. A narrow and compressed variety 
occurring of leaves of Zostera at extreme low tide, seems to represent 
the Atlantic A. alveus, Conrad. Giant specimens found between tide 
marks sometimes attain a length of nearly three inches. 
In nearly all our Vancouver Island localities two forms, very 
different to each other, exist side by side. The one is large and flat 
with an open colour pattern, the other more conical, darker in colour 
and with the markings much more delicate and close. This last is 
evidently the A. scutum of Eschscholtz, and in some of its varieties can 
hardly be distinguished from the Chilian A. scutum of D'Orbigny. Near 
Victoria it is rare to find a specimen that cannot at once be referred 
to the one or the other of these two forms. 
Dr. Jeffreys (in a paper which I have referred to under Modiolaria 
marmorata) speaks of this species as being very common in Japan, where 
however I do not think it occurs at all. 
The variety ochracea, Dall, described from Monterey, is credited to 
Vancouver Island by Dr. Pilsbry, but I have never seen a native specimen. 
299. Acm#A PELTA, Eschscholtz. 
Zool, Atlas, pt. 5, p. 19, no figure (1853). 
+ A. cassis, Esch, Zool. Atlas, pt. 5, p. 19, pl. xxiv, fig. 3 (1833). 
etc., etc. 
This species is almost as common as À. patina. It is very variable 
but it does not approach the last named in any of its forms. In the 
adult shells the interior is often entirely white, but there is a curious 
variety in which the interior is marked with numerous and close raised 
lines of purplish brown radiating from apex to the edge. 
300. ACMÆEA PERSONA, Eschscholtz. 
Zool. Atlas, pt. 5, p. 20, pl. xxiv., figs. 1 and 2 (1833). 
+ digitalis, Esch., ete., ete. 
This is a smaller species than either A. patina or À. pelta, and is not 
quite so Common. It is generally found very near high-water mark, and 
consequently it must spend much of its time out of water. 
