171 
New varieties of Crepidula rugosa Nutt. found on Natica and 
on Norrisia. Nautilus 19:50. Names the next two forms. 
2522 Crepidula rugosa naticarum 
White, porcellanous, more pellucid, maculated with chestnut- 
colored spots. Found in situ in San Pedro bay, Cal., on Lunatia. 
Lewisii. 
2523 Variety Norrisiarum Williamson. 
More porcellanous, interior light magenta-pink. Occurs on 
Norrisia Norrisii and heretofore determined as Crepidula adunca. 
Sby. 
2524 Crepidula nivea glottidiarum 
Dall, Nautilus 19:26. Uniformly straight, convex, smooth, 
equilateral, white and posteriorly attenuated. Found in situ on 
Glottidea albida, 
2525 Leda amblia 
“Shell chalky under a polished dark olive-green periostracum, 
compressed, rostrate, concentrically and feebly irregularly striate, 
with obscure microscopic radial lines; lunule narrow, lanceolate; 
escutcheon, long, wide smooth and slightly concave, the valve 
margins rising slightly in the median line; valves bluntly round- 
ed in front, bluntly truncate behind, the rostrate portion not 
set off from the body by any constriction, and the radial subangu- 
lar lines which bound the rostral area are feeble and obscure; 
interior whitish, with a deep subumbonal impression, a very shal- 
low and obscure pallial sinus, very short siphons, 12 or 13 ante- 
rior, 18 or 19 posterior normal hinge teeth, with a narrow, back- 
wardly oblique socket for the resilium. Lon. of adult shell 18, 
alt. 9.5, diam. 5.5, vertical of the beaks behind anterior end 7 
mm.’’—Dall, Nautilus 18:123. 
Type locality:—Monterey bay, Cal. 
2526 Magilia perattenuata 
Type locality:—-Monterey bay, Cal. (Woodworth). 
“Shell small, very slender, with one smooth turgid nuclear, 
and 6 smooth normal whorls; the whorls are but slightly convex, 
whitish, the suture very distinct, its posterior margin slightly 
overhanging or dominant; aperture narrow, short, simple, the 
outer lip slightiy concavely waved between the periphery and the 
suture, canal short, a little recurved, relatively rather wide. Lon. 
of shell 9.5, of last whorl 3.75, max. diam. 2.5 mm.’’—Dall, Nau- 
ullus 18:128. 
2527 Admete Woodworthi 
Type locality:—Monierey bay, Cal., in 10-45 fms. 
“Shell small, thin, whitish, with a yellow-brown periostracum, 
5 normal, sculptured, and 1 smooth, turgid nuclear whorl, grad- 
uaily increasing, subtabulate by a prominent spiral thread at the 
shoulder while young, rounded at the last whorl, with 8 or 9 
obscure riblets on the upper part of the spire, which are obsolete 
on the last whorl! and a half; spiral sculpture of rounded threads, 
with wider fiattish, somewhat irregular interspaces; peristome 
continuous with a slight notch or sulcus near the end of the 
nearly straight pillar, and with no umbilicus; there are 2 obscure 
plaits on the pillar, which is not marked by any umbilical chink 
or fissure; aperture with the external sculpture modifying the 
margin, but no lirations. Lon. of shell 9, of aperture 4, max. 
diam. 4.5 mm.’’—Dall, Nautilus 18:123. 
