FROM THE MONTE BELLO ISLANDS. 671 
Islands. This is necessary, as there can be no question that, due 
to the wide range of the species, it can and must be divided into 
subspecies. In the latest Monograph of the family, Pilsbry (Man. 
Conch. vol. xiii. p. 49 et seg., 1891) did not determine these but 
admitted demca saccharina Linné, quoting as a synonym Patella 
lane Reeve: p. 50, var. stellaris Q. & G., giving as synonyms 
stella Lesson and %octoradiata Hutton, and naming p. 50, var. 
perplexa nov., from Australia, quoting under this name 2 stellaris 
Reeye and octoradiata Hutton. He accepted Sowerby’s name 
costata for the Australian shell, synonymising with it Angas’s 
alticostata. In the Proc. Linn. Soc. N.S.W. 1904, p. 188, 
Hedley put on record that Pilsbry’s var. perplexa was absolutely 
Hutton’s octoradiata, and that this was a valid species. There 
can be no question about this, but Hedley accepted Hutton’s 
name, whereas he should have chosen Pilsbry’s, as Hutton’s name 
was invalidated by Patella octoradiata Gmelin, Syst. Nat. p. 3699, 
1791. 
Suter, reviewing New Zealand Acmeide (Proc. Malac. Soc. 
(Lond.) vol. vii. pp. 315-326, 1907), recognised in Patella stella 
Lesson (Voy. ‘Coquille,’ vol. 11. p. 421, 1831) the shell commonly 
known as corticata Hutton, but admitted the form Hutton named, 
with subspecific rank. He also pointed out its alliance with the 
Australian 4. alticostata Angas. The New Zealand species is 
- certainly specifically distinct from every form of sacchurina. 
At the same place Suter admitted octoradiata Hutton, and 
placed these two species in a subgenus Collisellina. This name 
was proposed by Dall (Amer. Journ. Conch. vol. vi. p. 259, 1871) 
for his section B, which covered saccharina Linné and borneensis 
Reeve. In the Voy. de l’Astrol., Zool. vol. iii. pt. ii. p. 349, 1835, 
Quoy and Gaimard introduced their genus Patellotda for southern 
Limpet-like forms with distinct anatomical features. In 1847 
Gray designated as type P. rugosa Q. & G., and as this is one of 
the original members of the genus this selection must stand. 
I suggest that P. rugosa Q. & G. is a member of the present 
group, and that Patellotda Quoy and Gaimard should displace 
Collisellina Dall. The group is well defined and easily recog- 
nisable. 
Patelloida stellaris Q. & G. for a New Ireland shell, which is 
certainly not identical with the North Australian form, is invalid 
on account of Bolten’s Patella stellaris (Mus. Bolten. p. 12, 1798) 
given to a different form of A. saccharina. 
Patella lanw Reeve was described from Japan. 
Other early names given to saccharina-like shells are all in- 
applicable to the Australian form, which is therefore unnamed. 
These differ appreciably from typical specimens, whether specimens 
from Monte Bello Islands, Port Essington, Cape York, or Port 
Curtis are contrasted, and I therefore note them as 4. saccharina 
Linné, var. 
Verco referred the shells from South-West Australia to 4. alti- 
costata, and specimens in the British Museum labelled West 
