386 Gould's Descriptions of Shells 
lowish, shaded with brown, so as to appear as if scorched; spire 
acute, having as many as eight convex somewhat angular whorls, 
which are girdled with dliveted threads, and have about eight vari- 
cose folds on each whorl disappearing on the last half of the anterior 
whorl: suture deep, to which the upper part of each whorl gradu- 
ally slopes. Aperture quite small, nearly semicircular, furrowed 
within ; beak nearly straight, and with a very narrow channel. 
Length one and three fourths of an inch ; diameter three fourths 
of an inch. 
From Mazatlan. Lieut. Green. 
The only described species to which it bears any resemblance 
are F. marmoratus, Phil. from Australia, which is twice as long, 
more numerously ribbed, mottled in coloring, and with the whorls 
more angular ; and F. rostratus, from the Mediterranean, which is 
smaller, and has remarkably rounded whorls with the folds extend- 
ing to the suture. 
ERATO LEUCOPHJEA (Pl. XIV. Fig.20.) 
T. obovata, solida, subfusca, valde callosa, callo et basi eburneis ; anfr. ad 
4 subangulatis, ultimo superne tabulato ; apertura angusta, labro antice exca- 
vato, concinne denticulato. 
Shell obovate, solid, polished, of a livid drab color, the lip and 
face ivory white. horls four or five, forming a low conical spires 
the outer whorl angularly rounded above; lip thick, rising poste- 
riorly somewhat above the bod y of the shell, slightly excavated ante- 
riorly, and its inner margin very delicately toothed ; columellar 
margin still more delicately toothed, with a conspicuous fold ante- 
riorly. 
Length one fourth of an inch; breadth one fifth of an inch. 
Inhabits Santa Barbara. Col. Jewett. 
Very closely resembling E. callosa, Adams (Voy. of Samarang) 
differing chiefly in color, and the more delicate denticulations of the 
aperture. 
CONUS RAVUS (PI. XIV. Fig. 21.) 
T. solida, aii oe bulbosa, spiraliter argute striata et antic? Jiris ele- 
vatis alternis majoribus instructa, falvida, epidermide briate induta; spira 
