CLASS GASTROPODA 
203 
by deep but not channeled suture, having a rounded periphery, a wide, 
completely pervious umbilicus and a large, very oblique, iridescent aper¬ 
ture. Axial sculpture of very fine silky incremental lines; spiral sculpture 
of low flattish threads separated by narrower interspaces sometimes carry¬ 
ing a finer intercalary thread; this sculpture is carried over the base but 
is absent from the walls of the wide umbilicus; aperture rounded, very 
oblique, the margins sharp, hardly meeting over the body except by a 
thin layer of enamel. Operculum brown, thin, multispiral. Height of 
shell, 8; max. diameter, 15 mm. (Dali.) 
Type in Museum at Ottawa, No. 4071. Type locality, Station 22, in 
N. Latitude 69° 35 ' and W. Longitude 163° 27', in 11-12 fathoms. 
Range. Southwest of Point Barrow, Arctic Ocean, and south and 
east to the Aleutians. 
Described as Margarites ecarinatus Dali. 
Margarites salmonea Carpenter, 1864 
Supplementary Report, British Association for the Advancement of Science, 653. 
Proceedings of the California Academy of Sciences, 3:158. Dali, Bulletin 112, 
United States National Museum; PI. 18, figs. 6, 9. Tryon and Pilsbry, Manual 
of Conchology, 11:295. 
Between pupilla and undulata: salmon-tinted, sculpture fine, not de¬ 
cussated; sutures not waved. 6-40 fm. (Carpenter.) 
M. t. inter M. undulatae et M. pupillae intermedia; minore, spira satis 
elevata; anfr. nucl. iii. purpureis; dein iv. normalibus, colore salmoneo; 
liris spiralibus in spira viii., quarum ii. suturales, minimae; suturis haud 
undulatis; interstitiis a lineis incrementi creberrimis, haud elevatis, sculptis ; 
basi lirulis creberrimis, aequalibus, circ. xviii. ornata; apertura sub- 
quadrata; umbilico minore, angulato; operculo tenuissimo, diaphano, anfr. 
circ. x. vix definitis. Long., 0.22; long, spir., 0.14; lat., 0.22; div. 80°. 
(Carpenter.) 
Shell intermediate between M. undulata and M. pupilla; smaller, with 
spire well elevated; with three purplish nuclear whorls; then four normal 
ones, of salmon color; with eight spiral lirae on the spire, of which two are 
very small, on the suture; sutures not undulate; with very numerous inter¬ 
stices on the lines of growth, not raised, incised; basis ornamented with 
numerous (about 18) equal lirulae; aperture subquadrate; umbilicus rather 
small, angulate; with very thin translucent operculum, with about 10 
scarcely defined whorls. (Translation.) 
Type in State Collection, Species 352. Type locality, Monterey, Cali¬ 
fornia. 
Range. Known only from the type locality. 
[805 ] 
