212 MR. P. L. SCLATER ON CASUARIUS SALVADORII. [Feb. 19, 



Anous cinereus (Neb.), Finsch and Hartl. F. Central- Polynesiens, 

 p. 239 (1867), Phoenix group, 3° 8' S., 171°W„ nee Gould. 



Hab. Pacific, from a little north of the Equator; Christmas Island; 

 the Ellice group, 9° S., 179°E., whence there are two specimens in, 

 the British Museum recently obtained by the Rev. S. J. Whitmee ; 

 the Phoenix group ; and Honden Island, Low archipelago. 



Anous cinereus, Gould. 



Peleeanopus pelecanoides, G. R. Gray, L. Birds Brit. M. iii. p. 180 

 (Australia, presented by Sir T. Mitchell). 



Anous cinereus, Gould, P. Z. S. 1845, p. 104 (N.E. Australia) ; 

 id. B. Australia, vii. pi. 76 (1848), Norfolk I. and N.E. coast Aus- 

 tralia. 



Procelsterna albivitta, Bp. Compt. Rend.xlii. 1856, p. 773 ; Gould, 

 Hand-b. B. Austr. ii. p. 420 (1865); Gray, Hand-1. iii. p. 123 

 (1871). 



Sterna cinerea, Schlegel, M. P.-Bas, Sternce, p. 38 (1863), Aus- 

 tralia. 



Anous albiviitatus, Finsch, P. Z. S. 1877, p. 776 (Eua, Friendly 

 group). 



Hab. Norfolk Island ; N.E. Australia and the Tonga or Friendly 

 group, in about 22° S., 175° W. It is presumably the species 

 observed by Mr. E. L. Layard in the Fiji group. 



The range of these two species appears to be nearly parallel, that 

 of A. cceruleus being the more northerly. A. cceruleus is smaller 

 than A. cinereus, Gould, and is darker all over, especially on the 

 underparts, which are blue-grey, whereas iu A. cinereus they are 

 nearly white. The differences are too great to be explained away as 

 being due to age, and I admit the distinctness of the two species ; 

 hut they are very closely allied. The fact of their being found in 

 iuch close proximity within so limited an area is very remarkable. 



February 19, 1878. 



Prof. Mivart, F.R.S , V.P., in the Chair. 



Mr. P. Geddes read a memoir on the mechanism of the odonto- 

 phore in certain mollusca. In this paper the view of Cuvier that 

 the movements of the radula depend upon those of the under- 

 lying cartilages was substantially revived. Arguments were adduced 

 against the more recent theory of Prof. Huxley that it runs like a 

 chain-saw, the cartilages merely forming a pulley-block. The 

 use of bacteria as food by Limnceus was also described in the 

 memoir, which will be published in the Society's 'Tranasctions.' 



Mr. Sclater exhibited the skin of a fine adult Cassowary, which had 

 recently been acquired for the collection of the British Museum. 

 The specimen was labelled "Wandamrnen, May, 1876," and was 



