81 
■5.A. NAT.. \'0L. NJV. 
.May, 1933. Hy Hrniard C. iUdioii end h. k. i>odjrcy. 
P. parvus Hedley 1896. PI. K fie. 9. Minute, solid, oblong, 
T;hite, involute, spire buried, nuperforate, the posterior o1 the 
inner portion of last whorl oblicfucly sloped; spiral grooves, about 
thirty, whose intcrscctices are three times their breadth, and are 
cut bv axial striae into squarish facets; mouth as long as the 
shell, vertical, contracted in middle. c.\panded above and below; 
outer lip smooth, thickened externally and internally, springing 
from a false umbilicus in vertex, arched higher than it; arcuate 
peripherally. cur\ing below the whorl up to the columella and 
K:hannclled'at junction; inner lip overlaid with callus; anteriorly 
the columella bears a strong entering (old, posy^rior and parallel 
to which is a weaker one, and posterior to this again a small 
deepy seated third fold is just distinguishable. Height 1.5. diara. 
i mm. (Type locality — Manly, N.S.W., alive, at low tide on 
rocks, and dead in shell sand from Middle Harbour). 
TRICLIDAE Sraphandrnlae). 
Spiral, spire sunken or concealed. 9 he lorm of ihe snell 
is so various that no useful diagnosis of the iamily can be drawn 
from it. Distribution — ^World wide. Fossil — Cretaceous. Animal 
W'ith a short cephalic shield, truncated posteriorly; no tentacles, 
■eyes deeply embedded; epipodial lobes well developed, three cal- 
careous stomachal plates, two broad and paired, one nananv and 
single; they are not tuberculate. Carnivorous. Sexes united. 
Cylichnella Gabb 1S73. Small, moderate!)' solid, subeyhn- 
•drical. the spire sunken and umbilicate or closed and concealed by 
the calloused inner lip; smooth or with spiral striae; nututh as 
long as the shell, narrow above, expanded and effuse below, lined 
base; columella rather thickened, simple or somewhat sinuous; 
outer !io receding towards the suture. Type — Bulla hidentata 
d.'Orbigny. 
C. arachis Quov S; Gaimard 183.5 [Bulla). PI. 1. ng. 10, 
Solid, cylindrically elongate, obtuse at both ends; periostracum 
cinnamon; white; spiral striations very delicate; umbilicate; 
nuHith very straight; peristome clear white; columella thick; 
rounded below. Height 24. diam. 9 mm. Not uncommon and 
generally distributed, from Beachport S.A. to Bunbury W.A. 
beach, and dredged to 150 fathoms. (Tyfc locality — King Georve 
Sound MhA.) 
C. thetidis Hedley 1903 [Cylichna), “d he Thetis Cylich- 
'iiella.” Narrow, elongated, cylindrical, thin; glossy, white; spiral 
incised lines, fine, close; growth lines hardly perceptible; 
narrowly umbilicate. partly roofed by a callous arch; mouth as 
long as the shell, narrow ab(j\'e. expanded and effuse below lined 
on inner side by callus; columella oblique, slighth' tveisted, 
uhlckencd, with a slight angle below; inner lip narrow, with a 
