Till 
capsule five, gibbous, spiny, many-seeded. 
There are four species. 
TRICERA, in botany, a genus of the 
MonoeciaTetrandria class and order. Na- 
tural order of Tricoccae. Euphorbi®, Jus- 
sieu. Essential character: male, calyx 
four-leaved ; corolla none ; filaments ovate : 
female, calyx five-leaved ; corolla none ; 
styles conical ; capsule three-horned, three- 
celled. There is only one species, liz. T. 
lasvigata, a native of Jamaica, in mountain 
coppices in the western parts of the island, 
flowering in the spring months. 
TRICHECUS, the walrus, in natural 
history, a genus of Mammalia of the order 
Bruta. Generic character : no fore-teeth 
in the full grown animal, above or belpw ; 
tusks in the upper jaw solitary ; grinders 
with wrinkled surfaces ; bodyjiblong; lips 
doubled ; hind feet stretched, uniting into a 
fin. These animals are all natives of the 
sea, and feed on sea-weeds and shell-fish, 
but are never known to eat flesh. There 
are three species, of which the principal is 
T. rosmarus, the arctic walrus, or the morse. 
This is an animal of a very inelegant struc- 
tiire. It has a small head to a vast body. 
Its under lip is covered with bristles nearly 
of the thickness of a crow-quill. In its 
upper jaw it has two large tusks from one 
to two feet in length, and weighing from 
three to twenty pounds. The walrus some- 
times grows to the length of eighteen feet, 
and the circumference, about the thickest 
part, of twelve. It is principally found in 
the high latitudes of the Northern Ocean. 
These animals are gregarious, and are often 
seen upon floating masses of ice, in im^ 
mense numbers, the greater part sleeping, 
but some always on the watch to give notice 
of approaching danger. They are harm- 
less when not provoked, but some ac- 
counts represent them as highly formidable 
in a state of irritation, the efforts of many 
being combined against the enemy, and 
firstening with tlieir teeth against boats to 
make holes in. them, or draw them to the 
bottom. Others represent them as less 
agitated by the fury of passion, and as in- 
clined more to flight than revenge, adding, 
that they are terrified by the slightest flash, 
and even the pointing of a musket will 
drive them in a moment out of sight. Their 
tusks serve the purposes of aiding their 
movements upon the ice, into which they 
are stuck, and on which, they thus secure 
their hold and sometimes drag on their un- 
wielfly bodies. The tusks are convertible to 
the purposes of ivory, and these animals are 
Till 
destroyed for the profit derivable partly 
from these tusks, but principally for the 
sake of their oil, ofwhicii a full grown wal- 
rus will yield a butt. The skin may be 
manufactured into a very strong leather. 
The alfectioii between the female and its 
young one, for it has seldom more than one 
at a birth, is such that they are said never 
to separate, and that when one is killed the 
survivor refuses to quit the dead body, and 
is considered by the hunter aJ his secure 
prey. Tlie walrus has been called, with 
little resemblance to justify the name, the 
sea-horse ; it is more similar to a cow, bat 
most of all to a seal. See Mammalia, 
Plate XXI. fig. 3. 
T. borealis, or tlie whale-tailed raanali, 
inhabits the seas betw'een K-amtscliatka and 
America. These animals live in families, 
generally consisting of a male and female, 
and two young ones of different age.s, and 
tlie attachment of the male to the female is 
so great, that he will defend her when at- 
tacked to the last extremity ; and if she 
happens to be destroyed and dragged to the 
shore, he will swim for some d-ays oft the 
fatal and detested spot. The manati ap- 
proaches very nearly to the cete li ibe, and 
its feet are little more than pectoral fins. It 
attains tlie immense length of twenty-seven 
feet, and tlie weight of four tons. In winter 
it is extremely lean, and its ribs may be dis- 
tinctly numbered. It will, when pierced 
with tlie harpoon, .sometime adhere 
rocks with its feet with uncommon tena- 
city, and when forced from them by a cord 
drawn by thirty men or more, is found to 
have left part of the skin of the feet be- 
hind. When any individual is haipooned, 
others are stated to swim to its aid, endea- 
vouring, some to overturn the boat, others 
to break the cord, and otliers again by 
blows with their tails, striving to dislodge 
the harpoon. Their sounds somewhat re- 
semble the snorting of a horse. They are 
never seen on land. 
TRICHILIA, in botany, a genus of the 
Decandria Monogynia class and order. Na- 
tural order of Trihitat-m. Melice, Jussieu. 
Essential character : calyx mostly five- 
toothed; petals five; nectary toothed, cy- 
lindrical, bearing the anthers at the top of 
the teeth ; capsule tliree-celled, three- 
valved ; seeds buried. Tiiere are twelve 
species. 
TRICHIURUS, the tricliiure, in natural 
history, a genus of fislies of tlie order Apo- 
des. Generic character : liead lengthened ; 
the gill-covers lateral; teeth ensifermed, 
