110 



up South-East coast ; 'also Tasmania, New South Wales, and 

 New Zealand. Upper beds of the Older Tertiary, River 

 Murray cliffs, at Aldinga and Hamilton ; Pliocene beds at 

 Limestone Creek, R. G-lenelg. 



Irregularly orbicular, flat, thin, ornamented with imbricat- 

 ing scaly laminse, and radial threads or ridges ; diameter, two 

 inches. 



Family Ostreld^:. 



166. Osteea Axgasi, Sowerby, in Reeve's Mon., t. 13, f. 27. 



Ranges from low tide to a few fathoms ; Davenport Creek, 

 in the Great Bight ; Coffin's Bay and Port Lincoln ; Spencer 

 and St. Vincent Gulf ; Kangaroo Island ; also Tasmania, New 

 South Wales, Port Darwin, and New Zealand. I# Pliocene 

 strata, Limestone Creek, and Ascot Heath, in "West Victoria. 



This species, which is the common " Port Lincoln oyster" of 

 the Adelaide markets, is the southern analogue of the Euro- 

 pean 0. edulis, under which species name, or as a variety, it has 

 been more frequently quoted by conchological writers. The 

 " Sydney rock-oyster" (O. glomerata, G-ould), so largely im- 

 ported as food, is not indigenous in our waters, but it has 

 lately been introduced, so I have been informed, to the Port 

 Lincoln district. 



CLASS PALLIOBRANCHIATA. 



1. Waldhemia flavescexs, Lamarck, An. s. Vert., [vi., 

 p. 246 ; Reeve, Mon. Terebratula, t. 2, f . 1. 



Attached to rocks and the bases of the large seaweeds be- 

 yond low tide. Fowler Bay, St. Vincent and Spencer Gulfs, 

 Encounter Bay. Also Victoria, Tasmania, and New South 

 "Wales. 



Ovate, inflated, with a pentagonal outline and broad radial 

 ridges ; length, one inch. 



2. Teeebeatella cancellata, Koch. 



Dredged in life from 32 fathoms in Backstairs Passage ; dead 

 shells from 20 fathoms, Encounter Bay (R. H. Pulleine!) 

 Also New South Wales (B?°azier\ West Australia (Dall), and 

 Tasmania (Challenger Exped.). 



Shell ovate, rather depressed, with a pentagonal outline, 

 ornamented with numerous radiating riblets ; length, three- 

 fourths of an inch. 



3. Megeelia Willemoesi, Davidson, Brach. Challenger 

 Exped., t. 4, f. 1-3, p. 51. 



One dead shell from 22 fathoms in Encounter Bay (B. H. 

 Pulleine /) 



A minute, inflated, smooth, ovate shell of a cochineal-red 



