On the Musculus Kerato-cricoideus. 327 
and outwards to be attached to the posterior margin of the 
inferior horn of the thyroid cartilage. He stated that the 
muscle was not found in every larynx, and that when pre- 
sent it existed only on one side. 
In my remarks, I supplemented the description of Merkel 
with some additional particulars, more especially pointing 
out, that, although, as a rule, the muscle only occurred on 
one side, right or left, as the case might be, yet that a double 
muscle might exist. I figured an example of such a bilateral 
muscle, which at that time was the only one I had seen. 
Since then I have met with two additional cases in which a 
double kerato-cricoid muscle was present. One of these was 
especially note-worthy, for the muscle, on both sides, was 
more largely developed than in any previous example that 
had fallen under my notice. The great size of the kerato- 
cricoid muscle was combined with a general laryngeal mus- 
cularity. The occurrence of three examples of a double 
kerato-cricoid muscle, during the last two years, within my 
own experience, shows that the bilateral arrangements is 
not so unusual as was in the first instance supposed.* 
Wednesday, 22d January 1862. — James M'Bain, M.D., R.N., 
President, in the Chair. 
The following gentlemen were elected Members of the Society : — 
Edward Hargitt, Esq., an Ordinary Member; and the Rev. William 
Caesar, Minister of the parish of Tranent, and Daniel Manson Logan, 
Esq., Seafield Lodge, Leith, as non-resident Members. 
The following Donations to the Library were laid on the table, and 
thanks voted to the donors : — - 
1. Report of the United States Commissioner of Patents, 1859. 
Mechanics, Vols. I. and II. — From United States Patent Office. 2. 
(1.) Annual Report of the Board of Regents of the Smithsonian Insti- 
tution for the year 1859. Washington, 1860. (2.) Smithsonian Con- 
tributions to Knowledge : — Astronomical Observations in the Arctic 
Seas, by Elisha Kent Kane, M.D., U.S.N., Washington, May 1860; 
Tidal Observations in the Arctic Seas, by Elisha Kent Kane, M.D., 
October I860.— From the Smithsonian Institution, U.S.A. 3. (1.) 
Notice of the Indians seen by the Exploring Expedition under the Com- 
^ Since the ahove was written, a specimen of a symmetrical kerato-cricoid 
has been sent me by Mr H. P. Mallam, who found it in a subject in the dis- 
Becting-room of Charing-Cross Hospital. 
VOL. II. 2 u 
