32 
39. Doris PRISMATICA, Var. IMPERIALIS. 
Form elongate, smooth, and convex above. Mantle small, narrow, 
dilated and rounded in front, and more acutely rounded behind. 
Foot much elongated, pointed posteriorly, and projecting far behind 
the mantle. Branchial plumes rather large, erect, non-retractile, 
ten in number, the six anterior ones simple, the succeeding two tri- 
furcate, and the posterior pair quadrifurcate ; they all decrease in 
height posteriorly, and in structure are linear, quadrangular and 
ciliated. Anal tube prominent. Dorsal tentacles oblong-ovate, 
slightly compressed, closely and finely lamellated obliquely and sub- 
retractile. Oral tentacles cylindrically tapering. Colour pale cream 
white, and spotted above and on the sides with nich yellow ; the spots 
are small, irregular, and very slightly raised, The mantle is mar- 
gined with purple, and there are a few broken rings of the same 
colour on the sides and upper posterior end of the foot, each ring 
having a yellow centre. The branchiz are pale and edged with 
purple. The dorsal tentacles are deep black, minutely speckled 
with white, and marked with two longitudinal white lines, one be- 
hind and the other in front. 
Length 2 inches. 
40. Doris PRISMATICA, var. LINEATA. 
Elongate, soft, smooth, convexly rounded above, rather wider pos- 
teriorly, portion anterior to the dorsal tentacles somewhat dilated 
laterally and rounded in front. Branchiz small, erect, lanceolate, 
pinnate, ten in number, encircling the vent and retractile into a 
common cavity. Dorsal tentacles elongate, straight, directed forward 
and laterally, lamellated about two-thirds of their length, and re- 
tractile into simple cavities. Foot elongated and projecting much 
beyond the posterior edge of the body in a point, rounded in front. 
Colour light greyish-purple, along the back and the remainder of body 
white, irregular, longitudinal, opaque fine white lines on the dorsal 
region, some of which are confluent. Margins of foot and body 
beautifully edged with violet. Branchize whitish and longitudinally 
striped with orange. Tentacles white, with an orange zone near 
the tips, and a second near their base. 
Length 1 inch. 
Genus Doriopsis. 
Oblong, or oval depressed ; mantle large, covering the head and 
foot. Dorsal tentacles two, lamellated and retractile, non-peduncu- 
late ; orals none. Branchial plumes disposed in the form of a semi- 
circle, on the posterior portion of the back, and retractile into a 
similarly formed slit, the convex portion posteriorly. 
41. Dortopsis GRANULOSA. 
Form oblongo-ovate, papillose, rather rigid, convex above ; mantle 
similarly rounded at both ends, entirely concealing the foot, rather 
contracted in the middle, and covered with minute irregularly promi- 
