230 CLASS VIT. 



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 Ndidce see DUGES Ann. des Sc. nat. xv. 

 pp. 322 324. Six or seven eggs are enclosed in a common capsule, 

 a grey-coloured vesicle of f line in diameter. 



[From later observations, as those of LEUCKART and SCHULTZE 

 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 (Aniphitritce, 

 Nereidce), but would seem in all to be limited to the period pre- 

 ceding the sexual development.] 



Enchytrceus HENLE. Mouth inferior, sub-terminal. Sexual ori- 

 fice in the eleventh ring of the body. Four fasciculi of usually three 

 setge short and uncinate in each ring. Body round, anteriorly 

 acuminate, posteriorly truncated. 



Sp. Enchytrceus albidus HENLE, MUELLER'S Arc/iiv. 1837, s. 74 go, Tab. vi; 

 a white worm two to six lines long, it lives in the earth and is especially 

 found in flower-pots. 



Tubifex LAM., Tubilumbricus BLAINV. Body filiform, transpa- 

 rent, doubly aculeate, attenuated at both ends, inclosed in a tube 

 composed of particles of mud and open at both ends. 



