STUDIES ON AUSTRALIAN MOLLUSCA. 



Part VI. 



By C. Hedley, F.L.S. 



(Plates i.-iii.) 

 (Co)iiinued from Vol. xxvi., p. 708.) 



BORNIA FILOSA, 11. sp. 



(Plate ii., figs. 15-17.) 



Shell small, thin, compressed, subtrigonal, nearly as high as 

 long, inequilateral. White. Sculpture : numerous close fine 

 radiating hair lines, which in the young shell are disposed in 

 several divaricating bundles; on the older shell they radiate more 

 regularly, and are cut into beads by concentric grooves. Anteri- 

 orly and posteriorly the radii diverge abruptly from the sculpture 

 of the median area. Length 6, height 5 mm. 



Hah. — Port Jackson; one valve adhering to an annelid tube, 

 taken by myself in Middle Harbour. 



Type to be presented to the Australian Museum. 



ROCHEFORTIA DONACIFOKMIS, Angas. 



Mysella donaciformis, Angas, P.Z.S. 1878, p. 863, pi. liv., f. 13. 



(Plate i., figs. 10-U.) 



Angas described and figured this species from South Australia, 

 but his illustration has been condemned by Dall and others as 

 unsatisfactory. A series of drawings is therefore now given of 

 a shell I o-athered at Middle Harbour, in length 6 mm., and in 



