72 
South .lustraiw.r. Shells. 
S.A. NAT., VOL. XIV. 
May, 1933 , 
SOUTH AUSTRALIAN SHELLS. 
(Including descriptions of new genus and species)^ 
PART VII. 
In this part the following families are treated: — 
Architectonidaej Heliacidae, Retusidae, Ringiculidae, Trie- 
lidae, AkeraUdae, Bullariidae, Aphistridae, Philinidae, Aglajidae^ 
Cavolhiidae, Spiratellidae, Tcthyidae, UmhracuUdae, Scyllaeidaej 
Aeolididae^ Pleurophyllidiadaej Argidae, Doriopsidae^ Polyceridae, 
ARCHITECTONICIDAE. 
Architecton = master builder. Shell orbicuiarj depressed or 
trochiform; mouth entire, angular or subcircular; lip and colu- 
mella simple, interior without nacre; umbilicus deep, usually wide, 
and usually with crenulated margins; main sculpture usually 
sfiral; operculum horny, spiral. Distribution — World-wide, in 
warm seas. Fossil — ^I'rias, maximum in the Tertiary. Few liv- 
ing species. The shells are not pearly like Trochus — \^■hich many 
of them resemble. 
Animal with very large oval foot, notched in front; tentacles 
cylindrical, folded throughout their length, thick, with eyes sessile 
on swellings near their outer bases. 
Philippia Gra}' 1847 (— Discuhis Deshay cs 1863). Conic, 
angular at tl^e periphery; without axial sculpture, spiral sculpture 
nearly obsolete; protoconch minute, smooth; umbilicus small, 
deep. Operculum flattened; whorls numerous, with nucleus sub- 
central; internal face bearing a subspiral calcareous process, 
dype — Solarhnn luteiim Lamarck 1822. 
P. lutea Lamarck 1822 (Solarium). Pi. 1. fig. L ‘‘The 
Yellow Philippia.’'’ Rather thin, conical; yellowish, with bands 
of small brown dots on the spirals above the suture and on the 
periphen-; umbilical crenulatlons white; spiral sculpture, a fine 
smooth thread above the suture, and two cinguli on the peri- 
phery; base spirally finely striated; growth lines oblique, fine; 
spire conical, a little higher than the mouth, outlines slightly con- 
vex; protoconch minute, smooth; adult whorls five, regularly 
increasing, flatl\' convex, the last keeled; base flattisli; suture 
but little impressed; mouth subquadrangular ; outer lip sharp; 
columella vertical, broadly rounded; umbilicus small, deep, mar- 
gin crenulated. Height 12, diam. 15 mm. Rare. Gulf St. Vin- 
cent, St. Francis Island, MacDonnell Bay, Glenelg River, and 
