150 
the rest. Average length of lateral spines, '27 mm. The 
minutely denticulated margin was not observed. Between 
the lateral spines and central jDlate, with its cuspidated edge, 
an irregularly triangular, plane plate. 
Dim. — Length 82, breadth 34 mm. 
Hah. — Dredged in 20 fathoms, off Antechamber Bay, 
Kangaroo Island, January, 1903. 
Ohfi. — The mollusc was kept alive for several days in a 
glass of sea water, and it was still alive when transferred to 
the preserv^ative. It has retained its colour remarkably well 
in a weak solution (3 per cent.) of formaline. 
Archidoris varia, Abraham. 
Plate v., figs. 1-5. 
Boris, vciriahilis, Angas, Journ. de Conch, xii., 1864, p. 
44, PI. iv., fig. 1 (not Doris variabilis, Kelaart, Ann. Mag. 
Nat. Hist. (3), iii., 1859, p. 300). Doris varia, Abraham, 
Proc. Zool. Soc, 1877, p. 209. Doris 'praetenera, Abraham, 
Proc. Zool. Soc, 1877, p. 258, PI. xxx., fig. 10-12. 
This species is as abundant in South Australian waters 
as in Sydney Harbour. 
In addition to the characters indicated by Angas we 
note that the skin is soft, and, in preserved specimens, has a 
flabby appearance. In dead examples the rugosities of the 
back sometimes disappear. The rhinophora arise from ele- 
vated conical sheaths, and are ornamented with about 24 
lamellae. Oral tentacles, with a deep longitudinal groove on 
the exterior side. Branchial plumes five, tripinnate. In 
colour the species ranges from pale yellowish (St. Vincent 
Gulf) to dark reddish-brown (Port River). The wrinkles 
on the back are outlined and exaggerated by a mesh-work of 
dark lines. The sole of the foot is white, edged with rich 
orange, and through the thin skin the liver is visible. Along 
the edge of the mantle muscle-fibres are discernible as short, 
white, radiating lines. 
Radula amber yellow. Lateral spines hamate, nume- 
rous, about 70 on either side of each transverse row, de- 
creasing very gradually in size inwardly. Average height of 
spines, "3 mm. No central spine. Twenty-three rows of 
spines in specimen examined. OC • o • X • 
Hah. — Dredged in 20 fathoms. Si. Vincent Gulf, Janu- 
ary, 1903, and Spencer Gulf (Verco) : Port River, in 4 
fathoms, April, 1902 (Field Naturalists) : taken at low water, 
Port Noarlunga (Ashby) : Port Noarlunga (Newland). 
Ohi<. — This species has hitherto been classified in Dori^. 
On account of the general form, grooved tentacles, and rad- 
ula. we propose to include it in Arrliirloi'i^. 
