186 THE SECRETARY Ol-f ADDITIONS TO THE MENAGERIE. [Mar. 21, 



Alcyonaria) and practical absence of certain families of others 

 (e. g. Chromodoriclse and Pseudoceridaa, of Nudibrancli Mollusca 

 and Planai'ian worms respectively) may be features indicative of 

 a subtropical fauna, or indications of the existence of a different 

 balance of life obtaining in the two Oceans. 



2. The Formation of Organic Rocks. 



(«) Between tide-marks by two kinds of Nullipore and Vernietus- 

 tubes, principally by the encrusting nullipoi-e and the tubes in 

 combination. An enormous quantity of these calcareous growths 

 is present on these coasts, though only as an incrustation a few 

 inches thick. The absence of reefs may be due to the small 

 vertical range of these growths on a remarkably steep coast, but 

 especially to the extraordinary abundance of boring Sponges, 

 Polychseta, and Mollusca, which more or less infest almost every 

 fi-agment. 



(h) Below tide-marks, 5-10 fathoms, by the growth of nodules 

 of Lithothamnion and great quantities of a foraminiferan. The 

 former is usually reduced to fine grey mud by boring organisms. 

 In 10-20 fathoms, by two more delicate species of red Alga and 

 by the above-mentioned foraminiferan. 



3. Beach- Sandstone is formed by the depositioia of calcareous 

 cement from fresh water on meeting the salt. The action of the 

 sea upon this rock has in one case produced a remarkable simu- 

 lacrum of a growing fringing-reef, which, however, is not being 

 extended by the growth of organisms upon its margin, but slowly 

 eroded by the sea. The total extent of this formation is insig- 

 nificant in proportion to the organic incrustations above. 



March 21, 1905. 



G. A. BouiiENGER, Esq., F.R.S., Vice-President, 

 in the Chair. 



The Secretary read the following report on the additions that 

 had been made to the Society's Menagerie in February 1905 : — 



The registered additions to the Society's Menagerie during 

 the month of February were 103 in number. Of these 26 were 

 acquired by presentation, 16 by purchase, 39 were received on 

 deposit, 21 by exchange, and 1 was born in the Gardens. The 

 total number of depai-tures during the same period, by death and 

 removals, was 94. 



Amongst the additions special attention may be directed 

 to:— 



1 . A female Kiang (Eqmos hemionus kiang) from Eastern Tibet, 

 deposited by H.M. The King on Feb. 23rd. 



2. A male Lynx [Felis lynx) from the Caucasus, received in 

 exchange on Feb. 24th. 



