230 CLASS VII. 
third daughter is found to be developed, which always arises more 
forward (the last is the oldest, that which first came into being), 
and ordinarily the first daughter already possesses the rudiment of 
a little daughter before she separates herself; the vessels, the in- 
testinal canal, the nervous cord run uninterruptedly through these 
united animals ; at length the united or compound animal is broken, 
and the eldest daughter (herself already a mother) separates herself, 
after the mother-nais has made frequent strokes to and fro with 
her tail. On the eggs of the Vaide see Ducis Ann. des Se. nat. xv. 
pp. 822—324. Six or seven eggs are enclosed in a common capsule, 
a grey-coloured vesicle of 3 line in diameter. 
{From later observations, as those of Leuckarr and ScHULTZzE 
referred to above, the process of non-sexual multiplication does not 
appear to be quite so simple as here described. The first and all- 
important step is the development of a bud between two rings 
nearly in the middle of the length of the body; so that this now 
consists of three portions, the anterior, the posterior, and the inter- 
vening bud. All the three become distinct individuals, the first, 
by developing its tail, the last its head, and the bud the head- 
segments and anal portion in the same order of succession as in 
development from the egg. Previous to the separation of these 
three worms a new bud is usually formed in front of the middle 
worm, and in front of it a third bud, &c., so that sometimes a chain 
of many connected individuals is met with which all receive nutri- 
ment (introduced by the mouth of the anterior member of the 
chain) from the intestinal canal common to them all. This process 
appears to have been observed in other families also (Amphitrite, 
Nereide), but would seem in all to be limited to the period pre- 
ceding the sexual development. | 
FEinchytreus HENLE. Mouth inferior, sub-termimal. Sexual ori- 
fice in the eleventh ring of the body. Four fasciculi of usually three 
setee short and uncinate in each ring. Body round, anteriorly 
acuminate, posteriorly truncated. 
Sp. Enchytreus albidus HENLE, MUELLER’S Archiv. 1837, 8. 74—90, Tab. v1; 
a white worm two to six lines long, it lives in the earth and is especially 
found in flower-pots. 
Tubifer LAM., Tubilumbricus BLAtny. Body filiform, transpa- 
rent, doubly aculeate, attenuated at both ends, inclosed in a tube 
composed of particles of mud and open at both ends. 
