'VI.— Observations on the Anatomy of the Paca 
of Brazil, (Coelogeiius, F. Cuv.) 
By Robert Edmond Grant, M.D., F.R.S.E., 
F.L.S., M.W.S., &c. 
Member of the Medico-Chirurgical Society of Edinburgh, Fellow 
of the Royal College of Physicians of Edinburgh, &c. 
A HE specimen of the Paca from which I have taken the 
following observations, was a full-grown male^ measuring 2 
feet 7 inches along the back, from the point of the nose to 
the anus, and having a circumference of SI inches round 
the belly, and 17 inches round the chest immediately behind 
the fore-legs. It was purchased from an American vessel 
at Liverpool, and, after two years' confinement in a travel- 
ling menagerie, it died of tubercular disease, which affected 
almost every organ of the thorax and abdomen. The skin 
of the animal being perfectly entire, and presenting a fine 
view of the characters of the adult Paca, fornis an interest- 
ing preparation in the Museum of the University. The 
carcase was presented to me for dissection by Professor 
Jameson. This animal is an inhabitant of the moist and 
sultry plains of South America, and has never been met 
with in any other part of the globe. It abounds in Brazil, 
Guiana, and Paraguay, where it lives and breeds, like a 
rabbit, in burrows on the banks of rivers. It generally 
