from the Gulf of California, elc. 381 
white or yellowish, with & more or less distinct dusky band near 
the suture, and sometimes pale flexuous lines on the larger whorls. 
Length five eighths of an inch ; breadth one eighth of an inch. 
This elegant little shell is distinguished by its small size and 
slender form, and its simple fluted surface without revolving lines. 
It has much the form and surface of T. nitida, but the size of 
T. fictilis and nassoides. 
TROCHUS MARCIDUS (PL. XIV. Fig. 11.) 
, T. pyramidalis, solidula, vix striata, rufo-viridis ; anfract. quinque planulatis 
ad suturam vix discretis; basis subplana, levis, umbilico amplo profundo in- 
fundibuliformi, juxta aperturam partim tecto; apertura subrhombea, perobli- 
qua; operculum tenue. 
Shell of moderate size, strictly pyramidal, the distinction of the 
whorls being scarcely marked at the sutures; surface with fine 
incremental stri, of a dull brownish and green color. Whorls 
about five, quite flat, the large one sharply angular at periphery. 
Base very slightly convex, highly polished and silvery near the 
aperture and around the umbilicus, which is deep, large and broadly 
infundibuliform, partially covered on the side of the aperture by a 
thin plate of shell, the margin of the funnel being indicated by an 
obtuse angle. Operculum very thin, of a dark amber color. 
Axis seven eighths of an inch; diameter of base one and one 
eighth of an inch. 
Inhabits Monterey. Lieut. Green. : 
In color and general appearance this shell would not at first sight 
be distinguished from T. Montereyi, Kiener; butit is a smaller and 
less elevated pyramid; and the base differs altogether in its per- 
fectly plain, broadly tunnel-shaped umbilicus, and its entirely sim- 
ple lip throughout. 
TROCHUS PICOIDES. 
Among the specimens obtained from Col. Jewett, was one from 
nta Barbara, which would at first glance be pronounced to be T 
pica. Being unprepared to see this species from the Pacific shores, 
I was led to make particular inquiry as to the certainty of its having 
been obtained alive at that place, and being satisfied on that point, 
I obtained the loan of three of the five specimens brought home. 
