182 UMBRACULUM. 
The soft parts have been figured by Blainville, Gray, Eydoux 
and Souleyet, and Gould. The locality of the single alcoholic spec- 
imen figured by the first two authors is not known. The figures of 
the Bonite voyage and the U. 8. Exploring Expedition were drawn 
from Sandwich Island examples; and this form Pease proposes to 
separate specifically from the “ U. indica” under the name auran- 
tium. The characters of the soft parts cited by him are useless, as 
no adequate information on those of U. sinicum is extant, his com- 
parison with the Bonite figures being fallacious on account of the 
fact that those figures were drawn from Sandwich Island specimens. 
He distinguishes the shells by the less marked radiating ribs and 
color of the inside, which is “in the center dark chestnut-brown, 
muscular impression yellowish, bordered by a concentric band of 
chestnut-brown, outer edge yellowish. Length 52, diam. 4 inches.” 
The animal “attains the size of 8 inches in length,” and when liy- 
ing is orange yellow. 
Hawaiian specimens before me differ slightly from typical U. sin- 
icum in the obsolescence of the radial ridges externally. The body 
is more depressed than in specimens of U. mediterraneum (judging 
both by alcoholic examples), the tubercles of the surface are higher, 
and the mantle edge has fewer, slenderer processes. 
Gould describes the Sandwich Island form as covered with prom- 
inent tubercles of different sizes, growing smaller toward the mar- 
gin, cream-colored, with olive shadings in the fissures, increasing 
toward the margin, branchiz orange colored. 
U. cuminer Deshayes. PI. 73, figs. 86, 87. 
Shell large, irregularly patelliform, ovate, the vertex excentral, 
bent toward the back and left side. White under a corneous, yel- 
lowish epidermis, with radiating obtuse angles. Lower surface 
with the central area subradiated with orange or chestnut, muscle 
impression narrow, continuous, irregular. Length 120, width 90, 
alt. 23 mill., or smaller. (Desh.). 
Island of Bourbon (Maillard). 
Umbrella cumingi Du., Moll. de ?Te Reunion, p. 52, pl. 8, f. 4, 
5. 
Readily distinguished from U. indica by the form and the rela- 
tive size of the colored middle area within. It is oval, quite regu- 
larly obtuse at the ends. Outside covered by a yellowish corneous 
epidermis, nearly identical with that of U. indica. This epidermis 
