

206 
Base not flat, sides concave; so that the shell rests on its 
ends; subcircular; margin simple. Apex pinkish, ground 
colour faint brownish pink. From just below the pink apex 
radiate four broad opaque white bands, which increase to 
eight. 
Dim.—Height, 26 mm.; major diam., 2°7 mm. ; minor 
diam., 2°25 mm. : 
Hab.—Spencer Gulf, dredged alive, depth unknown, 7 
individuals. 
The radula contains about 36 consecutive segments, each 
consisting of two marginals, two outer laterals, and one inner 
lateral. 2(2°1°0°1:2)2.. The marginals are thin and colour- 
less, with a long stem (fig. 8), the extremity expanded later- 
ally in a central direction (fig. 11), and reflected (fig. 10) ; 
the outer one the larger and including the inner (fig. 11). 
The outer laterals are short, stout, very closely approximated, 
hooked at the end, and brown (figs. 8, 11, 14). The inner 
laterals are less approximate, much longer (figs. 8, 11, 13), 
articulate at their base with the outer laterals (figs. 9, 12), 
but are separable from them. 
Obs.—I have called it a Helcioniscus. The dentition 
does not correspond with that of any of the Patellide, which 
seem all to have three marginals, whereas this appears to have 
only two. But for this its dentition is that of /elcioniscus, 
3(2°1:0°1'2°)3, and Patellina;. but its branchial cordon is in- 
complete, and this would place it in Helcioniscus. 
The figures are not all drawn from the same radula, but 
from three radule obtained from three individuals of appar- 
ently the same species. 
Patella ustulata, Reeve. 
, Conch. Icon., 1855, vol. viii., pl. xxxi., 
B.S., Tasm., 1877 for 1876, p. 49; also 
id May, Proc. Linn. Soc., N.S.W., 
chard and Gatliff, Proc. Roy. Soc., 
Vict., 1903, vol. xv. (n. s.), p. 93; P. (scutellastra) ustulata, 
eae Se in Tryon’s Man. Conch., vol. xili., p. 101, pl. xxii., 
gs. 11, 12. 
Patella tasmanica, Ten.-Woods, Rroc. Royal Soc., Tasm., 1876 
for 1875, p. 157; also 1877 for 1876, 49; 1878 for 1877, p. 45; 
Tate and May, op. cit., p. 411; Pritchard and Gatliff, op. cit., 
p. 193. 
This species is not found in Adcock’s andlist, and -was - 
only represented by a few poor specimens ‘among our col- 
lectors until recognized by me at Port MacDon 
ary of this year, when very many somewhat 
specimens were found. 









