210 
Obs—Angas, in Proc. Zool. Soc., 1867, p. 221, made his 
name a synonym of Patella costata (Lottia costata), Sowerby, 
Moll., Beechey’s Voy., t. 39, f. 2, 1839; and as Acmaa cos- 
tata, Sow., his shell is referred to by Ten.-Woods, Proc. Roy. 
Soc. Tasm., 1877, p. 50, and op. cit., 1878, pp. 44 and 45; 
“Pilsbry, in Tryon’s Man. Conch., vol. xiii., p. 51, pl. xxxvi.,. 
f. 72-77; Adcock, Handlist of Aquatic Moll.; S. Aust., 1893,- 
p- 9, No. 394; Tate and May, Proc. Linn. Soc., N.S. Wales, 
1901, vol. xxvi., part 3, p. 411; Pritchard and Gatliff, Proc. 
Roy. Soc., Vict., 1903, vol. xv. (n.s.), part 2, p. 194. But 
Hedley affirms them to be different species, loc. cit. 
It may reach the size of 2 in. long, 1°7 broad, and -8 
high. It is nearly always narrower anteriorly, sometimes 
markedly so; very rarely it is quite elliptical. The height 
may be ‘7 in. in a shell only 1°] in. long, or only ‘5 in 1°6, just 
twice as high proportionally. The shape may be acutely 
conical and straight-sided or flat-topped and convex-sided. 
The ribs vary from 14 to 27, increasing by intercalation with 
age, The interstices may be prettily ornamented with close- 
set fuscous crescentic lines, convex towards the apex; these 
may climb the sides of the ribs, or cross them; they are more 
marked in beach-worn shells. The interior may be wholly 
white, including the margin ; even the spatula may be scarcely 
tinted or distinguishable. The latter may be blackish-brown, 
or of any lighter tint of brown, its anterior and posterior 
parts being usually much darker. The margin may have no 
colouration, or very dark spots may mark all or some of the 
interspaces between the ribs. In addition to these a light- 
brown band may completely margin the inner border, or this 
may be found alone of any darker tint up to a purplish 
black. More or less rusty colouration may be found between 
the spatula and the margin, generally in blotches. 
Acmzea marmorata, Ten.-Woods. 
Proc. Roy. Soc., Tasm., 1876 for 1875, pp. 156, 157, and 
1877 for 1876, p. 53; Pilsbry., Tryon, Man. Gonek , 1891, vol. 
Kills eD Ose Loex lites figs. 66-70 ; Adcock, Handlist Aquatic Moll., 
S. Aust., 1893, p. 9, No. 399; Tate and May, Proc. Linn. Soc., 
N.S.W., 1901, vol. xxvi., pt. 3, p. 412; Pritchard and Gatliff, 
Proc. Roy. Soc., Vict., 1903, vol. xv. (n. s.), pt. 2, p. 4 
Patella latistrigata, Angas, Proc. Zool. Soc., Lond., 1865, p. 
154, and p. 186, No. 1964; Adcock, loc. cit., 1893; Pritchard and 
Gatliff, ie cit.; Helcioniscus latistrigata, Angas, Pilsbry., loc. 
cit., p. 143. 
Locality.—From Port MacDonnell to Port Victoria, 
Spencer Gulf. 
‘ Obs.—My largest individual from Port MacDonnell 
measures 24 mm. long, 22°5 wide, and 10 high. The alti- 
