B. G. Wilder on a foetal Manatee and Cetacean. 105 
Art. XVIL—On a fetal Manatee and Cetacean, with remarks 
upon the affinities and ancestry of the Sirenia ;* by Prof. Burt 
G. WILDER, of Cornell University. 
A jwtal Manatee—The foetal Manatee here described was 
obtained by Professor James Ortont at Pebos,t Peru, upon the 
Marafion, a tributary of the Amazonas. 
etailed measurements are reserved for a more extended 
article, but the following will be found useful. 
Sree et 11- 
Original weight (estimated by comparison with a fetal pig 
pirit), 22° 
Meter. 
Present apparent length, vertex to root of tail, (2°3 inches) *055 
ee apparent length (estimated as above), (2°6 inches) °059 
e ear 02 
OF mushie tO Pari ck oe a ee 0 
Ear to point Opoetile Musi. ou a ea 037 
olnt opposite anus to tip of tail_.__._...__.-..----- 90a8 
Real length, as if extended, (3°7 inches) . - 085 
Tip of muzzle to depression between eyes. .--.------- ‘O11 
CC VeH TO VOrERk: co oe a eS eee ee 015 
Total Magi if hed 0 See Ss ee, “026 
Wettn width Of ial 
It is not very easy to state the dimensions of this foetal 
manatee so as to permit accurate comparison with other foetal or 
adult individuals. This is owing less to the distortion of the 
in the adult, nearly coincide. | 
_ With adult animals a common measurement is from “ tip-to- 
tip;” from the muzzle to the end of the tail. It is evidently 
mappropriate to measure directly between these points in this 
or any other young foetus ; and almost equally so to follow the 
. Abstract of portions of a communication to the Boston Society of Natural His- 
tory, April 7th, 1875, 
wing me to be engaged in the dissection of a foetal dugong (24 feet long, 
3% m ve erously 
very gen 
rred the little manatee to the Cornell University. : 
+ Murray (3, 302) states that this species “ ascends the rivers Orinoko and Ama- 
zon for great distances.” Upon Map 11 the coloring indicates a westward limit in 
Brazil at about 65° west longitude. The locality above named is about 72° west 
longitude and 3° south latitude. 
number of references indicates the number of the work in the list at 
the end of this paper; the last the number of the page; the middle one, when 
it occurs. the volume, 
| More desir: hh ere ile eer ‘ie “ ee Pa yst £ weights and 
is the acceptance of a uniform method of weighing and measuring ani 
— their organs. The aphorism that “figures do not lie” is nowhere less true 
their 
in 
