226 
Habitat.—Dredged alive in numbers in mud at 10 
fathoms, off Banks Islands, and at 15 fathoms in Wallaroo 
Bay, Spencer Gulf 
Glycimeris LGBT CASON we Tole RT tet pf Ah 
Pectunculus pectinoides, Deshayes, Cuy., Régn. Anim (Fortin 
and Masson’s illustrated edition), Mollusques, pl. Ixxxvii., f. 8. 
Illustrations Conchyliologiques, Chenu, Pectunculus, pl. ii., f. 2: 
Reeve, Conch. Icon. Pectunculus, pl. viii., f. 44.  Pectunculus 
gealei, Angas, Proc. Zool. Soc. Lond., 1878, p. 183, pl. xx., f 
Type locality, off Port Macquarie, N.S. Wales. Tate, Trans. 
Roy. Soc. S. Austr., 1891, vol. xiv., part 2, p. 268; (Ghuaumerse), 
Tate & May, Proc. Linn. Soc. N.S. Wales, 1901, vol. xxvi., part 
3, p. 436.  Pectunculus flabellatus, Ten. Woods, Trans. Roy. 
Soc. Vict., 1878 (1877), vol. xiv., p. 61, 62. Type locality, Victoria 
and Tasmania: Tate, Trans. Roy. Soc. S. Austr., 1886, p. 103, 
No. 134: (Glycimeris), Pritchard and Gatliff, Proc. Roy. Soc. 
Vict., 1904, vol. xvii. (n.s.), part i., p. 248. Pectunculus orbicu- 
Jaris, Angas, Proc. Zool. Soc. Lond., 1879, p. 420, pl. xxxv., f. 9. 
Pectunculus beddomei, H. A. Smith. Chall., Zool., 1885, vol. 
Xvill., p. 255, pl. xvili., f. 1, 1b 
Our South Australian shell was first recorded by Tate 
as P. flabellatus, Ten. Woods, in 1886; later as P. gealet, 
Angas, in 1891. The species figured by Chenu as P. pecti- 
noides, Deshayes, and described and figured by Reeve as P. 
pectenoides, cannot be distinguished from a half-grown ex- 
ample of our shell. Reeve gives ‘““Bay of Panama’ as its 
locality, and says:—“After receiving from M. Deshayes the 
example of this species, originally described by him, Mr. 
Hinds supplied me with finer specimens from the collection 
of Captain Belcher.” The habitat is far distant, but our shells 
appear conspecific. 
It is not a common shell on our beach, but is fairly 
abundant in deeper water. It has been dredged in Spencer 
Gulf from Wallaroo Bay to Thorny Passage, in Investiga- 
tor Strait, in St. Vincent Gulf, and through Backstairs Pas- 
sage as far as Beachport. It has been taken alive at all 
depths between 8 and 30 fathoms, but is most numerous 
about 22 fathoms. Valves have been secured at all depths 
explored up to 150 fathoms off Beachport in decreasing quan- 
tities. 
It is a very variable shell. When young it has an orbi- 
cular shape, being rather longer than high, and having a 
_long, straight dorsal border. As it grows, it becomes higher 
“than long, and its dorsal border is proportionally much 
shorter. It generally remains almost symmetrical; rarely it 
becomes quite decidedly oblique. 
It may vary in obesity. One example, 41 mm. high, may 
be 30 mm. in section; another, 37 mm. high, may be only 
20 mm. in section. The latter are of the compressed P. bed- 
