■S.A. XAT., VOL. XV. 
march 27th, 1934. By Bernard C. Colton and /'. k' . Godfrey. 
fasciole elevated, two thin erect walls include fine close curved 
transverse scales: interior of fasciole marked bv a heavy streak ot 
callus. Length 19.3, breadth 14. height 5.6 mm. Beachport to L - 
mantle, down to 200 fathoms. (TYpc locality—Beachport, 200 A- 
thoms). The margin spreads more than in the Peronian E. sup r- 
ba, being widest at the lateral line of the apex, and it is me re 
attenuate anteriorly. 
E. rugosa Quoy k (iaimard 1854 ( = Clypidina Candida A. 
Adams 1851: - C. annnlala A. Adams 1851: - C. scabric ■ 'a 
\dams 1851: — E. lunpina Gould 1846: = C. acuminata Adams 
1851: not E. conoiden Reeve, tile Sydney shell. PI. i, fig. 5. “1 e 
Wrinkled KmarginulaG Oval, conical, limpet-like, protoconch 
central: whitish; primary ribs thirteen to seventeen, narrow, ne¬ 
ed, continuing to the apex, each interval occupied bv tlr-.-e 
small riblcts; ribs cancellated bv close, raised, concentric 
threads which form prickly scales where they cross the 
radiating ribs; interior greenish (or white), the area 
within the muscle-scar dark or outlined with dark green, usually 
distinctly mushroom-shaped: anal groove rather deep, nc * 1 1 
short. Length 17.5. breadth 13, height 8.5 mm. \oi uno 
mon, on rocks and stones above low tide mark; Port Lincoln, 
Kingscote, Venus Bay. Sceales Bav. Point Sinclair. Murat Bay. 
Streaky Bav, MacDonncll Bav, Beachport. Guichen Bay; dre. c- 
cd ^ ankahlla, Bay, 10 fathoms. Also W estern Australia —Km r- 
ance, Kllensbrook, Yajlingup, King George Sound, I LopeO n. 
Rottnest, where the largest specimen we have seen is 11.2 x ; .2 
mm. (Type locality—King George Sound). The primary ribs 
not split or double, and sometimes some are suppressed on t ie 
side slopes: margin very finely crenulated. denticles 60 to 72: a 
mushroom is usually outlined in dark green or dive, in the inter¬ 
ior; basal margins level, sides not arched upward, margin r t 
noticeably thickened. There is a variant in which the riblets 
are subequal. I lie radula of the species is quite different from 
that of IIcmitoma subemarginat a Blainvillc: the central tooth, is 
serrated and the laterals small in ntyosa: in subemarpinata tue 
central tooth is not serrated and the laterals are comparative;) 
larger. M. con aide a Reeve 11 cmitoma aspera Gould, the Per- 
onian shell, from Caloundra (Queensland) to Lakes Entrar.se 
(\ictoria) is not so tall as M. rupnsa, apex is more central. An¬ 
terior slope less arched, posterior slope not so steep and nr re 
•spreading basallv, sculpture coarser and less regular, and (esjvsi- 
ally in the northern forms) the coloration of the spatula is nr re 
marked. 
