74 
South JustniUan Shrlls. 
S.A. NAT., VOL. XIV 
May, 
H. stramineus Cimelin 1791 (= 7'. fiilva Hinds). “The 
Straw-coloured Sun Shell.” Convex, uniform yellowish-brown: 
axi:dl\' striated, spirally grooved and ribbed, ribs broad and Hat: 
suture profound; umbilicus wide, ribbed at the border, rib crenu- 
lated, umbilical wall with or without spiral ribs. Diam. 25 mm. 
Gulf St. Vincent, one fragment. King George Sound W.A.. 35 
fath(jmSj one alive (\ erco). (Type locality— Tranquebar, Phil- 
ipj'Ines). .Also recorded from New Guinea. I'he older authors 
gave the Ifast Coast of Africa as the habitat of //. stramhiens,- 
but afterwards a small shell agreeing with this species in sculpture 
and colour, and differing only in .size, was found in the Mediter- 
ranean and identified by Philippi as the same shell. Cantraine, 
considering the difference in size and the widely separated habi- 
tats has made the Mediterranean shell a distinct species and 
named it 7'. sicnia. At the best. Cantraine's species is but a 
variety, of which 7'. jallaciosa Tiber! is a synonym. 
RETUSIDAE (= Toniaiinidae), 
Spiral, cylindrical or fusiform, capable of containing the 
soft parts; spire short or sunken and concealed; protoconch more 
or less turned over; mouth long and narrow, wider below; colu- 
mella with or without a fold; umbilicus, if present, very narrow: 
no operculum. Distribution — World-wide. Fossil — Cretaceous. 
Animal wdtli the foot shorter than the shell, entire behind; head- 
shield short, quadrangular, produced in two erected processes 
behind, near the bases of which are the et'cs; gizzard with three- 
oval tuberculate plates. 
Retusa Brown 1827. Retusa — blunt. Subcylindrical. 
imperforate, with slightly raised, flat or depressed spire; mouth 
almost or quite as long as the shell, narrow above, dilated below; 
columella thickened, with a small fold or none. Type — R. ohtnsa 
Brown. 
R. atnphizosta Watson 1886 {LUnculits) . d he Ciiithed 
Retusa.” Rather broadly cylindrical, but contracted in the 
middle, and broadest below the contraction, bluntly _ rounded in 
front; translucent white, w'lth trace of spiral bands; axial striations 
faint, close, feeblest on the base; spiral striations, regular, with 
delicate spiral scratched lines; top of shell flat, but slighth’ de- 
pt essed; [ fotoconch papillate, small; whorls four, (jf which only 
the small rounded tojts are seen on the crown. Avherc they aie- 
sliglitly and radiately ridged; suture impressed, distinct; mouth 
as long as the shell, rounded below, long, narrow, rounded above: 
outer lip bends outwards below the middle; columella with a 
Slight fold and a narrow patulous edge, with a scarcely noticeable 
