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NOTES ON SOUTH AUSTRALIAN MARINE MOoLLusca, 
WITH DESCRIPTIONS OF NEW SPECIES.—PART V. 
By Jos. C. Verco, M.D. (Lond.), F.R.C.S. (Eng.). 
[Read May 7, 1907.] 
During the last session in Adelaide of the Association 
for the Advancement of Science, Mr. Hedley, of the Austra- 
lian Museum in Sydney, kindly examined, with me, a number 
of my South Australian shells, and has since compared them 
with types in the Sydney Museum. We have thus been able 
to identify several of our forms. He also took with him all 
my Pteropods, and returned them named. A trip to the 
three bays in the South-Hast of our State—MacDonnell Bay, 
Guichen Bay, and Lacepede Bay—provided a quantity of 
minute beach material, which has already proved to be very 
rich in novelties, and has provided examples of larger shells 
in such excellent condition as to allow one to speak more 
certainly upon some previously questionable points. 
Family PATELLID.&, Guilding. 
Genus PareLia, Linneus. 
P. ustulata, Reeve: 4 
This species was found in abundance by me this year on 
the rocks at Western Beach, Robe. Here and at MacDonnell! 
Bay it was seen in better condition and in greater numbers 
on the vertical face of the rocks, just above low water, than on 
the submerged reefs, less eroded and less encrusted. A vari- 
ant was taken at Robe, suggesting at first a new species, a 
rather narrow oval shell, with 22 to 24 large, rounded, close- 
Set radial coste, with one feeble or no interstitial riblet. 
Sy were found, however, to merge insensibly into the usual] 
orms. 
P. hepatica, Pritchard & Gatliff. ~~ 

At Beachport, on the shore, several dead shells were ae 
lected, some quite typical, with oblong oval border, and crowd- 
ed, fine, equal radial riblets. But, though retaining this out- 
line, their sculpture gradates into the sub-distant coste with 
Intermediate riblets of P. ustulata, Rve. In one individual 
the sculpture is that of P. hepatica until it is 18 mm. long, 
When 24 valid white scaly ribs arise. Another shell, measuring 
41 mm. by 36 by 20, is provided only with uniform crowded 
finely-scabrous riblets, combining the sculpture of P. hepatica 
with the shape and size of the largest of our P. ustulata. 
Zeny, gradation, too, can be traced between the oblong-oval 
D 
