98 
South .lustraliau Slit’lls. 
S.A. 
NAT., \»L 
May, 
XIV. 
193 :^. 
but encircled with a band of maroon, corresponding^ with the 
edge of the shell; periostracum very tough, and can he readily 
rernoved in one piece; apex prominent, somewhat Incuived. a 
little cxceiuric. Height 4, transverse diameters 19 and mm. 
Specimen illustrated. Height 5, diameters 30 and 26 mm. llaiher 
rare — Henley Ikacln Corne\- Point, Coobowic, St. Francis Is- 
land. also dredged Cape Jaffa, 90 fathoms. Type locality — 
Lower end of the South Channel of Port Pliillip, 7-16 fathoms, 
sand and weed (J. B. Wilson]). Animal deep port-wine colour, 
foot circular with an extended margin, underside of mantle cov- 
ered with small white carunculae (small pieces of flesh). 
SCYLLAEIDAE. 
Animal ccimpressed ; mantle produced into lateral lobes, 
v.’liich bear the branchial processes; tentacles with sheaths; mouth 
armed with corneous jaws. Distribution — South Britain, Medi- 
terranean, l^hilippines. Australia, on floating seaweed. 
Scyllaea Linne 1758. Sc\llaea = a sea n^unph. Animal 
elongated, compressed; foot long, narrow, and channelled, adapted 
for clasping seaweed; back with two pairs of wing-llke lateral 
lobes, bearing small tufted bi'anchiae on their inner surfaces; 
tentacles dorsal, sicndei^ with lamcllated tips, retractile into longr 
sheaths; givczard armed with horny knife plates; orifices on the 
right side. d\ pe — S. pelai{u'a lunne 1758. 
S. pelagica. Linne 1758. 1^1. 2. figs. 10, 11. "'Fhe 
Pelagic Scyllaea.' Body higher than broad. cream- 
coloured, transparent; tentacles rather small, laminated, 
issuing from large, compressed, trumpet shaped sheaths, 
1 rilled posteriorly; branchial processes consisting of two 
lobes on eacli side of the back (which arc laree, flattened, and 
rather irregularly shaped, each bearing tufts of branchial fila- 
ments over their inner surface) and of a central j''Ostcrior. crest 
shaped lobe (also bcarintr filaments) towards the tail; foot linear, 
the sides thin and capable of being drawn together for clasp- 
ing. ‘South Australian large specimen, length 42 mm, length of 
lobes 16 mm. Height of be)d}’ 21 mm., making a total lieight 
oi 37 mm. Antechamber Bay (Kangaroo Island). 20 fathoms; 
I'ort \\ illunga beach, also d'erre d’Edels. W'.A. (Peron). A 
world-wide }'»clagic species, on floating seaweed. It is singular 
among Sca-slugs in ha\ing its stomach fitted with plates of 
diitin to break down it food. Somewhat variable. The main 
differences are in the length of the dorsal lobes and the color- 
ation, the former ieature depending largely upon the degree of 
contraction, and the latter, no doubt, upon the colour of the 
seaweed u]’> on w'hich the animal lived. 
