6 DUBLIN TJNIYEHSITY 



garded only as approximately correct. Perhaps no two individuals, 

 measuring the same specimen at different times, would exactly agree in 

 their record. 



The Secretary also read a paper — 



ON THE TEETH OF THE HYPEBOODON. BY DB. DICKIE. 



On my arrival in town some weeks after the capture of the Hyperoodon, 

 I accompanied Mr. Patterson to the chemical works of Mr. Ritchie, 

 where the bones of the animal were lying. "We examined the jaws 

 very carefully, but found only two teeth, one on each side of the 

 lower jaw, near the symphysis. Each is a hollow cone, open and jagged 

 at the base, and ending somewhat abruptly in a very sharp point. I 

 prepared a longitudinal section of one of the teeth, and found a small 

 quantity of osteo-dentine at the base, with a layer of cement inclosing 

 the central dentine. The cement extended all over the tooth, but was 

 very thin at the apex, this thinning taking place abruptly a little way 

 below the tip. Enamel is altogether wanting, in which respect the 

 teeth of HyperoodoD differ from those of the Dolphin, which have a 

 layer of enamel near the end. 



Professor Owen, in his "Odontography," alludes to tubercles on the 

 roof of the mouth which are supposed to represent the baleen of the Bahe- 

 nidae ; he had not examined any specimen of these tubercles. Unfor- 

 tunately, in the example which came under my notice, all the softer 

 parts had been removed from the upper and lower jaws, except those 

 which correspond to the gum, and embedded in the putrid, though still 

 very tough, remains in which we found the two teeth alluded to. 



After which the members proceeded to ballot, and the following 

 gentlemen were elected as officers for 1857-58 : — 



Pbesident. — Alexander H. Haliday, A. M., M. R. I. A., F. L. S., &c. 



Vice-Pbesidents Professor "W. H. Harvey, M. D., M. R. I. A., 



F.L.S., &c, and Rev. Professor S. Haughton, A.M., F. T. C. D., 

 M.R.I.A., &c 



Honobaby Membebs. — The Rev. the Provost, the Rev. the Vice- 

 Provost, the Senior Fellows. 



Tbeasubeb. — The Rev. Thaddeus O'Mahony, A. B. 



Libbabian. — W. B. Brownrigg, Science Scholar, T. C D. 



