1865.] MOLLUSCAN FAUNA OF SOUTH AUSTRALIA. 647 
25. MacoMA UMBONELLA. 
Tellina umbonella, Lam. no. 48 ; Hanley, Desc. Cat. p. 70; Sow. 
Thes. Conch. pl. 56. f. 13. 
Station. In sandy bays. 
Hab. Port Lincoln. 
26. ARCOPAGIA DECUSSATA. 
Tellina decussata, Lam. Anim. sans Vert. vi. p. 205. 
Station. Amongst rocks and stones at low tides. 
Hab. Rapid and Aldinga Bays; Tasmania and Port Phillip. 
27. LATONA EPIDERMIA. 
Donazx epidermia, Lam. Anim. sans Vert. vi. p. 243. 
D. deltoides, Lam.; Sow. Genera of Shells, no. 10. 
D. levigata, Dillwyn. 
Station. In sand at low water. 
Hab. Encounter Bay ; the Coorong. 
This species is abundant on most of the sandy shores of the 
southern portion of Australia. On the coasts of New South Wales 
and along the Coorong it is eaten by the natives; and large heaps 
of the shells may be seen about their old fires and camping-places. 
28. SEMELE EXIGUA. 
Semele exigua, H. Adams, P. Z.S. 1861, p. 385. 
Station. In sand near tide-marks, 
Hab. Spencer’s Gulf. 
This beautiful little species is an aberrant form of the genus, and 
has much the aspect of a Tellina. 
29. *SEMELE ADA. 
Semele ada, Adams & Angas, P. Z.S. 1863, p. 426. 
Station. Dredged in 3 fathoms water. 
Hab. Port Adelaide Creek, north arm. 
30. DONACILLA PRECISA. 
Mesodesma precisum, Desh. MS. (Mus. Cuming.); Reeve, Conch. 
Icon. pl. 4. f. 31. 
Station. Sands at low water. 
Hab. Salt Creek; St. Vincent’s Gulf; Tasmania. 
31. DoNACILLA ELONGATA. 
Mesodesma elongatum, Desh. MS. (Mus. Cuming.); Reeve, Conch. 
Icon. pl. 1. f. 5. 
Station. Sands at low water. 
Hab. On most sandy shores in both gulfs; New South Wales; 
Tasmania; Bass’s Straits; Swan River. 
