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. Pound 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 perattemiata 



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 slightly 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- 

 tilus 18:12.'i. 



2527 Admete Woodworthi 



Type locality: — Monterey 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- 

 ually 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 flatfish, 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. 



