THE NAUTILUS. 99 
sent out under this name, it may be well to say that this shell is 
somewhat triangular with rounded margins, nearly as large and 
solid as the average P. variabile, horn colored shading to yellow at 
the borders, some specimens with dark blotches or stripes near the 
basal margin. The California types were described as having 
“valves shallow in the cavity,” but the northern shells are more full 
and rounded. 
P. randolphii n. sp. Shell rounded oval, moderately inflated ; 
anterior end elongated and perfectly rounded, no angle indicating 
the junction of the anterior and basal margins; posterior margin 
sloping abruptly from the very short hinge margin; beaks decidedly 
posterior, fairly prominent ; surface very finely and evenly striated, 
polished, of a most peculiar greenish-yellow color, different from 
other Pisidia, but much like some Corbiculas. ‘This of itself makes 
it easy to separate from P. abditum and P. variabile, associated spe- 
cies. Long. 0°18 inch; lat. 0°14 inch; diam. 0°10 inch. Found at 
Seattle. Dr. J.G. Cooper says the shell most nearly resembling 
thisis P. harfordianum Pr., a species practically unknown to collect- 
ors, and of which he has only a young specimen. 
Pp ?n.sp. A rotund, orbiculate, dull yellow Pisidium, 
with prominent beaks and projecting scutellum, was collected by 
Mr. Hemphill in Patten Lake, Whateom County. Dr. Sterki con- 
siders it identical with a species apparently common in the region 
of the Great Lakes, to which he has applied the name P. scutel/atum 
(in letters). A deep water form is supposed to be P. abyssorwm Stimp., 
but as Dr. Stimpson’s manuscript was destroyed by fire, and his 
types mixed, this can never be certainly known. Figures and more 
minute descriptions of this and P. randolphit may be expected in 
Dr. Sterki’s coming monograph. Additional specimens are urgently 
desired of this and other species of the Pacific Slope, which are, at 
present, deplorably scarce. 
I believe it is safe to say that P.insigne Gabb., P. harfordianum 
Prime and P. angelicum Rowell are unknown, except from the 
original lots. P. occidentale Newcomb seems to be only a form of 
P. abditum Hald. Additional specimens may confirm that view or 
prove the contrary. The most experienced collectors disagree re- 
garding the identity of the Spheria. This tangle need not long 
remain if sufficient material can pass under the eye of a competent 
conchologist. Pacific coast collectors have generally given their 
attention to marine and land shells, and it would seem that a field 
for discovery is open among the freshwater species. 
