186 MOLLUSCA. 
the base in the smaller specimens: aperture circular; columella 
rounded, straight, a little excavated in the umbilical region: outer lip 
crenulated by the sulcations; ribs and sulcations very slight on the base. 
Axis three-fourths of an inch; diameter two-thirds of an inch. 
Inhabits Puget Sound, Oregon. Lveut. Case. 
This shell resembles, in most respects, J. doliarius ; small speci- 
mens are like Margarita cinerea, Couth. 
Figures 207, and 207 a, front and base of the shell ; 207 4, details of 
the sculpture. 
Trocuus PuPiLius (Gould ). 
Testa parva, elevato-conica, marguritacea extrinsecus tncana, filis virido- 
Suscis ubique cincta, ad intervallos minutissimée clathrata: spira 
anfractibus sex convexis: basis planiuscula, fissura umbihcah per- 
forata: apertura circularis ; columella arcuata: faux fulgida, minu- 
lissime punctata. 
Trochus pupillus, Goutp; Proceed. Boston Soc. Nat. Hist., 1. 91. 
March 1850. Expedition Shells, 56. 
SHELL small, ovate-conic, rather solid, perforate, ash-coloured, with 
darker greenish on the ribs, sub-surface brilliant silvery ; surface with 
small, flattened, nearly equal and equidistant ribs, about five on the 
upper whorls separated by interspaces of the same width, and with 
fine, crowded, lamellar lines of growth, by which the interspaces are 
distinctly barred : spire of six convex whorls, the last obtusely angular, 
flattened at base, and with much finer and more crowded ribs and 
grooves. Aperture circular; columella somewhat arcuate, with a 
minute, groove-like umbilicus at its side; lip sharp; interior pale and 
opaque near the lip; minutely punctured, and with crimson irides- 
cence within. 
Length of axis three-tenths of an inch; diameter one-fourth of an 
inch. 
Inhabits New Zealand. 
