156 
prominent. Branchial plumes twelve, intetrgrown at the base, 
and rather difficult to separate, incompletely surrounding the 
tubular anus in horseshoe shape, the posterior portion being 
bare ; they are retractile with the anus into a common cavity ; 
the five posterior plumes on either side terminate in the s^me 
foot stem respectively, the remaining two plun'es are unequal 
in size. Colour, rich reddish-yellow. 
Radula. Deep yellow to brown in colour. Lateral spines 
numerous, about 140 on either side; simply hooked, with an 
average length of '2 mm. ; about 80 rows in specimen examin- 
ed. No central spine. The shape of the odontophore and iiie 
arrangement of the spines are similar to the corresponding 
features of Doris adelaidce, sjjec. nor. Formula, oc • o • OC . 
Dim. — Length 111, breadth 25, height 31 mm. 
Hah. — Dredged in 20 fathoms. Gulf of St. Vincent, anl 
off Antechamber Bay, Kangaroo Island, January, 1903 (Dr. 
Verco) ; taken at low water, Port Noarlunga CDv. Torr and L 
Ashby) ; and Salt Creek Bay, Yorke Peninsula (E. H. M?xt- 
thews). 
Ohs. — This fine species appears to be fairly plentiful and 
well distributed within our gulf. Dr. Verco has dredged it o.i 
various occasions. Though specifically identical, the littoral 
specimens are nowhere nearly as large as the deep-water forms. 
The specimens from Antechamber Bay, in particular, deserve 
mention for their large size ^^nd fine colouration. 
Ceratosoma adelaidse, spec. nov. 
Plate X., fig. 3-4. 
Body small, flattened on top, elongate, a little wider at 
the head than further posteriorly, terminating in a small tail. 
Mantle sparingly developed. Foot rounded in front, attenu- 
ated behind, projecting to no considerable extent beyond the 
mantle. Colour white underneath, scantily spotted witli 
light lilac along the sides : the dorsal surface, for the most 
part of a pale buff colour, is bordered on either side by some- 
what regularly spaced deep reddish-violet spots (about eight 
on either side), which are made the more pronounced by being 
surrounded each by a whitish space, the interspaces between 
these spots being of a somewhat deeper shade of brown tiian 
the rest ; the central area is decorated with rows of light 
bluish spots. Dorsal tentacles club-shaped, obliquely lami- 
nated, orange-red in colour. Branchial plumes coherent a»- 
their base, apparently six, non-retractile, of the same tint as 
the rhinophores. 
Dim. — Length 8, breadth 3 mm. 
TJah. — Taken at low water off Marino Rocks in Decem- 
ber, 1901 ; and also off Edithburg, Yorke Peninsula, m Janu- 
ary, 1903. 
