46 AGLAJA. 
hind edge of the mantle, the left one bearing a flagellum. The head 
disk issmaller and more trapezoidal than in the other Mediterranean 
species. The foot occupies the front three-fourths of the entire 
length of the body. 
A. peprcra Renier. PI 12, figs. 68-70; pl. 1, fig. 12 (x 7); pl. 18, 
deentoyn iil: 
Back of the body and outside of pleuropodial lobes chestnut, 
brown, blue-gray or violet-black, maculated and marbled with 
white. Head-shield and lateral lobes edged with two narrow stripes, 
one blue, the other yellow. Head-shield with two short stripes of 
buff in front. Sole velvety-black or violet-brown, sometimes orna- 
mented with whitish spots. Gill orange or pale brownish. Posterior 
lobes of mantle joined, the left one with no flagellum. Length 35-60 
mill. 
The shell (pl. 12, f. 63, 64, 68, 70; pl. 1, f. 12) is not so different 
from that of A. tricolorata as would be thought from the figures ; 
but the small spire is more solute, and the projecting process is 
smaller; the large thin outer whorl shows 2 or 3 more or less dis- 
tinctly marked growth-zones; this quite cuticular, pale yellowish 
part is in some individuals, especially the younger ones, more or 
less calcified, excepting always the anterior part; in the large indi- 
viduals it was completely cuticular. Diam. from edge to edge 
across spire, 7-12 mm. Ina large individual, length 55 mill., the 
the shell measured in greatest length 16% mill. 
Mediterranean Sea. 
Aglaja depicta RENtER, Tay. di Class., 1807, pl. 8 ; Oss. Posthume, 
p. 4, 7, pl. 16, f. 1-11—Doridium depictum Bercu, Mittheil. Zool. 
Stat. Neap., xi, p. 123, pl. 8, f. 11-138, 17; Bull. Mus. Comp. Zool., 
xxv, p. 209, pl. 10, £9; pl. 12, f 8.—Doridium coriaceum and D. 
membranaceum MECKEL, Beytrige zur Vergl. Anat. i, 2te Heft, p. 
33, (1809).—Acera carnosa CuviER, Mém. sur les Acéres, Ann. Mus. 
H.N. Paris, xvi, p. 9-12, 14-15, pl. 1, f. 15-20, (1810)—Doridium 
carnosum DELLE CHIAJE, Mem. sulla Storia e Notomia, etc., i, pl. 
76, f. 9-11; pl. 107, f. 2—VavyssrERE, Rech. Moll. Opistobr., p. 45, 
pl. 2, f. 42-44—Doridium aplysiaeforme DELLE CutaJsE, Mem. ii, 
p. 185-192, pl. 13; t. 80, f. 23, (1825) —Acera aplysiaeformis Can- 
TRAINE, Malac. Medit., p. 74.—Hidothea marmorata Risso, Hist, 
Nat. Eur. Mérid,, iv, p. 46, pl. 1, f. 9—Doridium marmoratum Can- 
TRAINE, Bull. de ? Acad. Roy. des Sci. de Bruxelles, 1835, ii, p. 386. 
—Acera marmorata CANTRAINE, Mal. Medit. et Lit., p. 73, pl. 2, f. 
oe 
