CLASS GASTROPODA 
195 
front of it horizontal with a fine spiral thread at a short distance, giving 
a somewhat tabulate effect; somewhat more distant is a second stronger 
thread at the shoulder, and a similar one at the periphery, while a fourth 
forms the margin of the base against which the suture is laid; on the base 
are four more similar threads, becoming gradually more adjacent and 
feebly beaded or nearly simple, except the fourth, which is distinctly, 
minutely beaded, while a fifth, forming the brink of the large, wide, and 
deep umbilicus, is even more strongly beaded; axial sculpture of minute, 
feeble radial wrinkles which at their intersection with the posterior thread 
crenulate it, and on the second and third threads produce, at intervals of 
about a millimeter, sharp, triangular, subspinose nodules; the entire shell 
is covered with axial, fine, retractive, silky striation; whorls full, base 
rounded; umbilicus very deep, funicular, the walls axially striated; aper¬ 
ture rounded-quadrate, the margin thin; pillar oblique, slightly excavated, 
not callous, slightly expanded; body and throat pearly. Alt., 21; of last 
whorl, 14; of aperture, 8.5 ; maximum diameter of shell, 19.5; of umbilicus, 
5.5 mm. (Dali.) 
Type in United States National Museum, No. 125964. Type locality, 
U.S.S. “Albatross” Station 3376 off the Ecuador coast, in 1,132 fathoms. 
Range. San Diego, California, to Ecuador. 
Described as Solariella equatorialis. 
Genus SOLARIELLA S. Wood, 1842 
Shell umbilicated, conical; whorls with spiral granose lirae; umbilicus 
with carinated margin. (Tryon and Pilsbry, Manual of Conchology.) 
Type. S'. maculatum Wood. 
Distribution. Arctic to California, circumboreal. 
Solariella peramabilis Carpenter, 1864 
Plate 91, fig. 8; Plate 101, fig. 7 
Supplementary Report , British Association for the Advancement of Science, 653. 
Tryon and Pilsbry, Manual of Conchology, 11:312; PI. 67, figs. 59-61. 
Shell very thin, very elegantly sculptured, livid, spotted with pale 
rufous-brown; nuclear whorls 2, very tumid, smooth, apex mamillated; 
following whorls 4, tabulated, sutures nearly rectangular; upon the spire 
there are two or three carinae, and intercalated carinulae; the entire sur¬ 
face is most elegantly and densely radiately costate, costae very acute, 
subgranulose upon the carinae, interstices on the first whorl fenestrated, 
posteriorly decussated; base deeply rounded; sculptured with about 5 
lirulae, anteriorly granulose; and radiating costulations continued from 
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