S.A. NAT., VOL. XV. 
MARCH 27tji, 1934. By Bernard C. Colton and F . K . Godfrey. 43- 
An average Flindersian specimen has straighter lateral margins, 
tapering anteriorly and spreading posteriorly, compared with 
Hlsbry s illustration. Recorded, from \ ictoria and North Coast 
of J asmania where it is said to be rare. Hedlcv suggests that 
the scar is caused by the adherence oi a Capulus or some such 
association. from 7. parmopholdcti (the New South \\ ales shell) 
1 . acatricnsus is more depressed, sides more parallel, protoenneh 
nearer the margin, more stronglv notched anteriorly, and sculp¬ 
ture much coarser. 
Einarginula Lamarck 1801 (= Semperia Crosse 1867). 
Slit Limpets. i he genus name refers to a little notch in the 
maigin. Oval, oblique!)’ conical, the recurved protoconch dir¬ 
ected backward; front slope with a deep incision in the margin; 
vnal fasciolc distinct extending upward from the fissure, sculp¬ 
tured differently from the other ribs of the surface; surface lat¬ 
ticed; no septum or deck inside. Tvpe—A. cornea Lamarck 
3 801. Cap-shaped shells, with a vertical slit in front, which is 
partly filled up as the shell increases in size, so as to leave a 
uirrow; prutoconch always spiral; inside thickened on each side 
•of the slit, l he mantle of the animal protrudes from the slit, 
outside which it. forms a short tubular process. Slit-limpets 
inhabit Europe, Asia, Africa, America, and Australasia. The 
very young resembles a Scissurclla\ the fry has no slit. Kniary- 
iicuJa in the restricted sense, is a good location lor di/rc/a Adams, 
Candida Adams, subtilitexla \ erco. pahtla Cotton, t'/.indersi Cotton, 
Montfortula (subgenus) 1 red ale 191 j- Oval, conical, prn- 
toconch subcentra!; axial ribs numerous, raised, narrow, cancel¬ 
lated by man) concentrics; margin crenulated; internal anterior 
groove distinct, ending in a notch. Tvpe— Ktiuir^hnda niyosa 
4)uoy & (iaimarch A. stcllala A. Adams, also belongs here. 
E. dilecta A. Adams 1851. “The .Beloved Emarginula." 
1 dongate oval, subquadrangular. much depressed; summit sub- 
posteiioi, inclining backwards; white; decussated with subdistant 
i ad i a ting asperufate ribs, and elevated concentric lirae; base ar- 
<uate; mao gin ol aperture denticulate, deeply fissured in front. 
Length 12. breadth 8.5, height 4.5 mm. All along the 
South Australian coast, not uncommon, beach and dredged to 1 10 
fathoms. Also Western Australia—Hopetoun, Ellensbrook. Bun- 
bun-. and common at Rottncst. (Type locality—King George 
Sound, W.A.), \ aries greatly, some very flat, others elevated; 
sornc have about t went)-lour prominent ribs which project slight¬ 
ly beyond the base with intercostal riblets. in others the rilw are 
more nearly equal and are rounder and less scaly. One example 
from St. Francis Island is normal but has no slit at the end of 
its Jasciole. 
