776 ARTICULATA—EARTH WORM 
body. What are termed eyes in some species, are but ocular points, which 
are not conceived to give the faculty of sight. The Annelides are either 
naked, or construct tubes or sheaths for themselves, more or less solid, in 
which they remain without attachment. These tubes, or sheaths, are in 
some, membranous or horny, incrusted exteriorly with grains of sand, or 
fragments of shell, in others solid, caleareous,and homogenous. The greater 
part of the Annelides are carnivorous, sucking the blood of other animals. 
They are hermaphrodite, but require mutual impregnation. Cui %r divides 
the class of Annelides into three orders :—1. Tusicon#, those in which the 
dronchie are in the form of tufts, attached to the head or anterior part of the 
body, and generally inhabiting tubes. 2. Dorstprancuix, where the bronchize 
are toward the middle of the body, or along the sides. 3. ABRANcHIa, where 
the bronchie are not apparent externally. Lamarck, on the other hand 
divides the class into three orders, from other considerations, viz. : 
Order I. SepENTARl=.—Destitute of dntenne, eyes, and jaws, and inhabit 
ing tubes. 
Order I]. Anrennata.—Head with antenne and eyes, and a protractile 
proboscis often armed with jaws. 
Order III. Avoprs.—Destitute of feet or setiferous papille, and anten« 
nated head. 
THE EARTH WORM! 
Has a power of contracting or lengthening itself at will. There is a spiral 
muscle, that rurs round its whole body, from the head to the tail, somewhat 
resembling a wire wound round a walking-cane, which, when slipped off, 
and one end extended and held fast, will bring the other nearer to it; m 
this manner the earth worm, having shot out or extended its body, takes 
hold py the slime of the fore part of its body, and so contracts and brings 
_} Lumbricus terrestris, Lix. The order Apodes to which the earth worm belongs, are ' 
destitute of feet, without setiferous and retractile ia ea ; bronchize, when known, disposed 
iteriorly along the body ; no antenniferous head. 
