97 
S.A. NAT., VX)L. XIV. 
-May, 1v.'3. By Bernard C. Cotton and F. K. Godfrey, 
Thi^ species has not been found, as the name falsely implies, at 
Norfolk Island (Hedley). The auricle produced by the reflected 
dorsal margin is more expanded in 7'. concava {Aplysia) than 
in tins similarly shaped but differently coloured shell (Sowerby). 
Anitr.al about 40 mm. long, brown as the kelp-weed, spotted 
with scattered W'hite dots, and edged with black along the mar- 
gins rtf the lobes and on the tentacles: parapodial lobes sfiort. 
united behind, with digitate margin, free from the siplion; crown 
of shell protruded through an opening In the centre of the mantle; 
on h.Ind right side the mantle is produced into a large orifice 
enclosed by upstanding lobes; from the shell the mantle is ra\ed 
with brown and white; branchiae in life entireh' concealed; tail 
rather long. I’he animal kept in confinement did not use its 
lobes for swimming, and emitted purple uhen annoyed, r'he 
exposure of the shell and production of mantle in a tube connects 
this witli the European T. depUans Linnc. and conscouciul) 
places it In the typical section of Tethys as restricted bv Pil.s- 
bry. Probably A. briinnea Hutton, A. tryoni Meinertx., and 
others will be reduced to the synontmi of T. norjolkensis when 
they are carefull)' re-examined (Hedley). 
UMBRACULIDAE (= UmhreUidae). 
Shell external, limpet-like; \'ertex near the centre: 
nucleus minute, slnistral; interior with a circular closed 
muscle-impression. Distribution — World-wide, tropical and sub- 
tropical. laminarian zone and deeper. Fossil — Eocene. Animal 
having the foot very flesh}% large, oval, with a deep anterior 
sinus in which the mouth-parts are situated; gill a long adnate 
plume, extending across the front and along the right side, free 
and biplnnate behind. Both sexes are combined In the one 
individual. Plant feeders. 
Umbraculum Schumacher 1817 (—Umbrella Lamarck 1819; 
— UrnheUa d’Orbieny 1841: = Operculatinn H. S; C. Adams 
1854. Umbraculum, a parasol. “Chinese Umbrella-shell.’" 
Limpet-like, depressed, sinistral; vertex to the left of and somc- 
\^.'hat behind the centre, usually coloured,, more Ic.ss conically 
elevated; apex of scarcely more than one whorl, mluiiie. curved 
backward. Type — Patella umbraculum Sohander 1786 Patella 
umbella Martyn 1788, which occurs from East Africa to the 
Sandwich Islands. 
U. corticalis Tate 1887. PI. 1, fig. 22. Orbicular, mod- 
erately ele\'ated, thin; primrose yeiiow; concentrically striated, 
and with a few obscure radial ridges; covered, except apex, with 
a well developed periostracum, which extends about half as far 
again as the shell, and raised Into about twenty broad rays, di- 
pi.onjpi iaso[[3iuB[ X[[Hai.nii30uoo si put? *\mdu uioaj Suifl.mA 
