115 



Notes on South Australian Marine Mollusca, 

 with Descriptions of New species. -Part XIII. 



By Jos. C. Verco, M.D. (Lond.), F.R.C.S. (Eng.). 



[Read October 4, 1910.] 



Plates XXIX. and XXX. 



This paper consists of full notes on the South Australian 

 species of the genera Scissurella, Schismope, Pyrene, and 

 Turritella, and of occasional notes on species belonging to 

 several other genera. 



I am indebted to Mr. Hedley, Mr. W. L. May, Mr. Gat- 

 liff, and Mr. Gabriel for specimens given or loaned and sug- 

 gestions made. The usual difficulty was found in dealing with 

 the mass of material in the genus Pyrene, owing to the varia- 

 tions in each species. Pace, in his preliminary paper on the 

 C olumb ellidce (in Proc. Mai. Soc, London, 1902, vol. v., 

 p. 39) regards the colour markings as of considerable value in 

 distinguishing species, and I set myself the task of studying 

 these very closely ; but I cannot say they proved of very great 

 or very definite use, though of some assistance. My conclu- 

 sions are not altogether in accord with those of other Aus- 

 tralian workers, and are intended rather as suggestions for 

 further advances. I found great difficulty, too, in dealing 

 with the deep-sea Turritellas, especially the larger forms be- 

 longing to the group of T. runeinata and T . accisa, Watson. 

 He has several species from Australian waters which I cannot 

 recognize with certainty, and my examples show so much varia- 

 tion in sculpture as to make splitting them up into species 

 too dangerous, and to render their accurate description as 

 varieties too difficult and laborious at present. 



Scissurella australis, Hedley. 



Scissurella australis, Hedley, Memoirs Austr. Mus., 1903, part 

 6, vol. iv., p. 329, fig. 63. Type locality— "63 to 75 fathoms off 

 Port Kembla, New South Wales." Gatliff and Gabriel, Proc. Roy. 

 Soc, Victoria, 1910, vol. xxiii. (N.S.), part 1, p. 95, "off Wilsone 

 Promontory." 



Dredged in 130 fathoms off Cape Jaffa, 4 dead; in 150 

 fathoms off Beachport, 1 good; in 200 fathoms, 1 good: in 

 300 fathoms off Cape Jaffa, 4 dead. Identified by Mr. Hedley 

 from his type. 



Scissurella obliqua, Watson. 



Scissurella obliqua, Watson, "Chall." Reports, Zool., vol. xv. 

 1886, p. 116, pi. viii., fig. 5. Type locality — "Kerguelen Island 



