85 



28. Lutraeia dissimilis, Deshayes, m Proc. Zool. Soc, 

 1854, p. 72. 



Surveyor's Point, Port Adelaide Creek, and Aldinga Bay, in 

 St. Vincent Gulf ; Port Lincoln, Fowler's Bay ; also Tasmania 

 and New South Wales. 



A large thick species attaining to three and four inches long ; 

 ventral and dorsal margins nearly parallel, covered with a 

 dirty brown epidermis. 



Family Scrobictjlarld^. 



29. Semele Ada, Adams and Angas, in Proc. Zool. Soc, 

 1863, p. 426. Plate v., fig. 8. 



Port Adelaide Creek {Angas), Holdfast Bay, Wallaroo Bay, 

 and Fowler Bay. 



Transversely-ovate, thin, white, compressed, concentrically 

 rugose-plicate, excavated in front of the acute umbos ; front 

 side rounded, posterior side shorter, obtuse-angled ; under 

 half an inch long. 



30. Semele exigtta, H. Adams, in Proc. Zool. Soc, 1861, 

 p. 385. Plate v., fig. 5. 



Holdfast Bay, Stansbury, and Streaky Bay. In sand near 

 low tide mark, Spencer Gulf {Angas) . 



The type specimens are reported from Tasmania, but accord- 

 ing to Tenison Woods the species is not known there. 



A white oblong shell, finely concentrically striated, posterior 

 side subangulated with a strong fold continued to the ventral 

 margin ; length, about five-eighths of an inch. 



Family P aphid je. 



31. Mesodesma prjecisa, Deshayes, in P. Z. S., 1854; id. 

 Keeve, Mon., t. 4, f. 31. 31. obtusa, Crosse and Fisher, Journ. 

 de Conch., 1865, t. 11, f. 4, p. 428. 



In sand at low water, Holdfast Bay, and west shore of St. 

 Vincent Gulf, Port Lincoln ! (type locality of M. obtusa) ; 

 Streaky and other bays in the Great Australian Bight ; Spencer 

 Gulf. 



This species was founded on Tasmanian specimens ; it also 

 inhabits King George's Sound ! 



Ovate, waxy-white, roundly truncate behind ; about one inch 

 long. 



32. Mesodesma elongata, Deshayes, P. Z. S., 1854 ; id. 

 Eeeve, Mon., t. 1, f. 25. 



On all sandy beaches, and occurs all round Australia. 

 Triangularly elongated, posterior side short and truncated, 

 light-horn coloured ; under one inch long. 



