-/9t)\ 



PEOCEEDINGS 



OF THE 



LINNEAN SOCIETY OF LONDON. 



(ONE HUXDEED AND ELEVENTH SESSION, 189S-99.) 



November Srd, 1898. 



Dr. Albert C L. Gt. Gunthee, E.R.S., President, in the Chair. 



The Minutes o£ the last Meeting were read and confirmed. 



Messrs. Albert Harrison and William Joseph Eaiubow were 

 elected Fellows of the Society. 



The President exhibited an abnormal twin tusk of an adult 

 Indian Elephant and made the following remarks : — The tusk 

 occupied the right jaw of the animal. The two teeth were deve- 

 loped from separate papillae and remained perfectly separate, 

 without any connecting ossification, although they grew side by 

 side from tlie same socket, the uneven surface of one clcsely 

 fitting into that of the other. The outer tooth is much larger 

 J. than the inuer, the circumference of the outer being 124 and of 

 7 the inner Qg inches. The irregularity of growth seems to have 

 ^ afi'ected the structure of the ivory, w'hich crumbled away, leaving 

 ^~ only an irregular stump projecting a i^^ inches beyoud the 

 ^ socket. 



-. He was inclined to look upon the smaller tooth as a persistent 

 7 milk-tooth, which, not being shed, continued to grow from its 

 5 original papilla ; but Mr. Charles Ton es, E.R.S., considered it a 

 ^ case of duplication, such as is sometimes found in man and other 

 • mammals, in which the development of two separate papillae gives 

 ~i rise to a twin tooth of the permanent dentition. No such case 

 ^ seems to have been previously observed in the Elephant. 



'^ Prof. Gr. B. How^es, F.E.S., exhibited some young and six 

 N living eggs of the New^-Zealand Lizard Sphenodon {Katteria), 

 ^_ received from Prof. A. Dendy of Christchurch, N.Z., part of a 



a:^ l^lSS. SOC. PEOCEEDIJfQS. — SESSION 1898-99. 6 



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