The South A-ustralian Naturalist. 
91 
Turbo Griineri Occasionally collected on our Ciulf bcadies. 
About the same size as preceding specimen. Xo umbiiication 
color, shaded salmon-pink. 
FAMILY NERITIDAE. 
Fcrita melanotragiis. Our State has only one representative of 
this widely distributed family. Its dense, black shell con- 
trasts sharply with its highly colored cousins from tropical 
waters. 
hleritidae spend considerable periods out of water, but generally 
are found on the shady sides, and in deep fissures of 
rocks exposed at lowtide. The wonderfully constructed tooth- 
ed operculum, fitting closely the aperture, is a notable feature, 
FAMILY ACMAEIDAE. 
These limpets now take the name Patelloxdea, About ten varieties 
have been described, some being very plentiful on rocks 
exposed by receding tides. 
Fatelloidea septifor?nis occurs in great numbers at Port Willunga. 
The average measurements on their oval base of a large quan- 
tity collected being 18 mm. x 13 mm. The exterior generally 
eroded makes it difficult to see the sculpture. Interior scar 
purple and brown, edges of shell spaced with brown spots. 
Fatelloidea alticostata. A limpet with 18 or 20 well-defined ribs, 
shining white within, with a blackish, horse-shoe shaped scar. 
This handsome shell was invariably found further out on 
the rocks than P. septiformis. Collected at Port Noarlunga 
and Willunga. 
Fatelloidea niarmorata. A more or less rounded limpet found 
in company with P. septiformis. Exterior generally much 
eroded. Interior scar black, circled with a narrow white line, 
then clouded sepia to edge of shell. 
Other shells of Acmaeidae are P. calamus, P. cantharus, P. 
conoidea, P. flammea, P, inradiata, P, punctata, P. subun- 
dulata. 
FAMILY PATELLIDAE, 
These limpets, whose home is on rock faces fully exposed to the 
rush of the surf are well adapted, in their conical-shaped, 
smooth, solid sides, and powers of adhesion, to resist dis- 
lodgement by wave action. 
CeWana variegata may be taken off almost any of our rocks. It 
is stated that they return to their own particular roost, after 
wanderings in search of food, which is scraped off with their 
sharp radula. A microscopic view of this organ shows it 
it to be a wonderful object, coiled up like a watch spring. 
