78 



Palliobranchiata, 5. The publication of a revised list of our 

 bivalves has further been rendered desirable by reason of con- 

 siderable changes in the nomenclature. Some of the altera- 

 tions consist in the substitution of prior names, and a few of 

 them are a consequence of more correct identification. 



To render this list a partial aid to the determination of the 

 species, I have added brief characters to each when considered 

 necessary. 



I have thought it superfluous to furnish all localities at which 

 & common species occurs, and only in the case of rare species 

 have localities and the collectors' names been given. The sign (!) 

 following the collector's name indicates that I have examined 

 specimens from the reported locality. In every instance I have 

 exercised the utmost care in investigating the circumstances 

 under which the species were obtained to the exclusion of all 

 possible scources of accidental introduction. 



The chief collections which I have had under examination 

 .are those of Mr. W. T. Bednall, embracing the coast-line from 

 Port Lincoln to the South-east ; Mr. Forwood, Holdfast Bay ; 

 Mr. Tepper, Ardrossan ; Dr. Gosse, "Wallaroo Bay ; Mr. 

 McDougall, Southern Yorke's Peninsula ; Mr. Pulleine, St. 

 Vincent Gulf and South-east coast ; the South Australian 

 Museum, St. Vincent Gulf. I have to acknowledge also my 

 obligations to Mr. Brazier, of Sydney, for his assistance in the 

 determinations of some critical species ; by reason of his exten- 

 sive conchological library and accurate knowledge of Australian 

 species, a value is attached to his identifications, which few 

 authors can attain to. Personal explorations during the past 

 eleven years have embraced all the more important collecting 

 stations from the mouth of the river Glenelg to Eucla. 



Dredging operations have been undertaken only to a limited 

 extent, being chiefly restricted to the shallow waters of the 

 Port Adelaide creek and St. Vincent Gulf. A haul from 32 

 fathoms in Backstairs Passage brought to light a few species 

 hitherto unknown to occur with us. Mr. Pulleine's dredgings in 

 deep water off Encounter Bay, carried on during the early 

 months of this year, have been more fruitful of results, and the 

 oyster dredgings in the Port Lincoln District have furnished 

 some little information. And though we may congratulate 

 •ourselves with an extensive acquaintance with the Molluscan 

 life of the littoral and shallow water regions, yet we do 

 anticipate a new revelation when the deeper parts of our 

 •oceanic waters shall have been explored. 



The following list embraces all the species previously re- 

 corded under specific names different from those employed in 

 the present work and such as are excluded or unrecognisable. 

 In the first column are given the names hitherto used ; in the 



