irh ,'.
I: , mouth and for a short distance along the sides, and then simple and
gradually increasing in the width of the expansion towards the
end, where it is very wide beneath the hranchia ; it is stained with
black on the inside of the edge. Branchial plume posterior, concealed
between the foot and the hinder lobes of the dorsal disk. Head
presenting exteriorly a small lobe on each side the oral opening.
Shell internal, situated at the hinder extremity above the hranchia,
white, calcareous, uncoiled, consisting of one or two volutions,
thickened at the free “ sutural line,” convex externally and concave
within, cup-shaped at the commencement, with the outer edge
extended by a broadish membranous expansion.
Total length 38 millim.; cephalic disk 18 long and 16 wide at
the broadest part ; shell with a greatest diameter of 8 millim., and
about 2 in height.
Hab. Thursday Island, Torres Straits, 4 -5 fathoms, on a sandy
bottom.
The only species which appears to have been recorded from the
Australian coasts is Aglaia lineolata, figured by H. & A. Adams in
the ‘ Genera of llocent Mollusca,’ vol. iii. pi. 58. fig. 4. This differs,
however, in the form of the anterior dorsal disk and its small
size in proportion to the hind part of the animal, in addition to
wliich tho colour and markings appear to be quite distinct. Aglaia
gigliolii, from Japan, described by Tapparone-Canefri (A*oy. Magenta,
p. 110, pi. 1. fig. 18), may be distinguished by the posterior lobation
of the cephalic disk, different colour, and apparent different position
of the branchial plume.
Doridium cijaneum, D. nigrum, and D. guttatum, described by Dr.
A’ou Martens from tho Indian Ocean, have not yet been figured.
Until all these exotic species have either been compared or much
more amply described and illustrated, there will remain much un certainty
respecting the identification of all or any one of them.
126. Pleurohranchus angasi. ( P la te VI. figs. K, K 1.)
Animal (in spirit) uniformly pale huff, elongate ovate. Mantle
probably smooth in life, wrinkled by contraction, not very widely
produced at the free margin. Foot broad, tapering behind, roundly
suhtruncate in front, where there is a thickening forming a double
margin beneath the proboscis. The frontal veil is straight in front,
angular a t the sides, which are grooved. Tentacles shortish, slit at
the outer side, with the minute eye-specks at their base behind.
Branchial plume consisting of about sixteen leaflets. Penis spinelike,
very acute, and slightly curved at the tip.
Shell placed well forAvard, the pale apex being posterior. I t is
brown in front, glossy, and beautifully iridescent on the exterior.
I t consists of about a Avhorl and a half, the nucleus being spiral and
hollow within. The last whorl is much prolonged by additional
strongly defined concentric layers, and also ornamented with fine
yet distinct transverse striæ. The columella is arcuate, and has an
umbilical groove parallel with it.
Length of animal 17 millim., diam. 7 ; length of shell, from
nucleus to opposite end, 4 |.
Hah. Port Jackson (Coqipinger).
This may be the P delicatus of Pease, but there _ appear to be
certain differences in the shells of the two forms which may be of
specific value.
127. Dolahella rumphii.
Cuvier, Ann. du Mus. v. p. 437, pi. 29. fig. 1.
Hah. N.E. Australia ( C'oj^^^mp'ér) ; Moluccas (tonmp/wAs) ; Timor
(Pérou) \ Waigiou (Quay and Gaimard); Mauritius (Rang and von
Martens).
A There is no indication of any caudal prolongation in the specimen
before me, the hinder end being (in spirit) \æry broad and obtusely
curved.
The shell agrees with the figure given by Bang (Hist. Nat. des
Aplysiens, pi. 1).
128. Aplysia sparsinotata.
Animal of a pale colour in spirit, varied with a few dark distant
dots along the sides, caudate posteriorly. Middle of back between
the mantle-lobes in front of the shell, also the inner surface of the
anterior portion of the lobes themselves, exhibiting irregular brownish
patches. Lobes commencing a short distance behind the dorsal
tentacles, and tei'minating behind at about the same distance from
the end of the body. Oral tentacles moderately large and long ;
posterior conical, acuminate, not far apart.
Shell elongate, rather beaked behind, sharply arcuate in front,
15 millim. long, 1Ü broad. Animal about 45 in length.
Hah. Same as A . piiperata.
129. Aplysia piperata.
Animal (in spirit) olivaceous, minutely and closely dotted everywhere,
with the exception of the foot, with hlaok ; hinder third
part of the body sometimes paler than the rest, from which it is
marked off by a blackish band passing right round the animal.
Lobes of the mantle narrowish in front, where they arise quite close
to the posterior tentacles, considerably dilated behind. Oral ten tacles
large, long, and pointed; posterior small, close together,
conical.
Shell Avhite, concave within, subquadrate. Length 27 millim.,
width 22. Animal about 80 long.
Hah. Thursday Island, Torres Straits, 4 -5 fms., sandy bottom.
Peculiar on account of the position of the posterior tentacles, close
to the origin of the mantle-lobes.
130. Aplysia deaisoni.
Body (in spirit) high, exhibiting a distinct pedal disk, produced
posteriorly into a caudal termination. The entire surface wrinkled,
I