THE MOLLUSCA OF FUNAFUTI. 



(SUPPLEMENT,) 



By CHARLES HEDLEY, 

 Conchologist, Australian Museum. 



IN the year 1897, a second, and .in 1898, a third expedition visited 

 the Atoll of Funafuti in prosecution of the attempt to carry a 

 bore through the coral formation. The mollusca herein described 

 were obtained by these parties, chiefly by deep dredging, and were 

 remitted to the Australian Museum by the Local Funafuti 

 Committee of the Royal Society. This material reached the Writer 

 too late for incorporation in the body of this Memoir. The results 

 of a study of it are accordingly presented in this appendix. 



This material is of importance since it illustrates a side of the 

 Funafuti zoology which I had little opportunity of investigating 

 personally, viz., that of the deeper water. Dredgings carried out 

 by Mr. G. H. Halligan in one hundred and fifty fathoms, and again 

 in two hundred fathoms, produced results of especial interest. 

 In the latter depth he discovered a bed of the typical "Pteropod 

 Ooze." The sample of his dredgings submitted to me, might have 

 stood for the portrait of that deposit figured by Murray and 

 Renard.* 



This ooze has been chiefly, studied in the Atlantic, and though 

 its equal distribution in the Pacific is a matter of course, the 

 present record is an interesting extension of the known range. 



But the chief claim that this deposit has on our attention is 

 that it appears in water of less depth than in any instance known 

 heretofore. The least depth in which the " Challenger " obtained 

 Pteropod Ooze was in 390 fathoms, the greatest 1,525 fathoms, 

 the average being 1,044 fathoms, f 



The following species already noted as from surface waters again 

 occurred in greater depths : 



Teinostoma tricarinatum 150 fathoms off Beacon Islet (Funa- 

 manu), and 36 fathoms north of Pava Islet. 



Cisondla ovata 150 fathoms off Beacon Islet (Funamanu). 



Stomatella sanguinea36 fathoms N. 30 West of Pava, 45 - 52 

 fathoms off Tutaga Islet. 



*Murray and Keuard Chall. Rep., Deep Sea Deposits, 1891, pi. xi. fig. C. 

 f Murray and Kenard loc. cit., p. 225. 



