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rtUil in tbo prosont ease I found soivrcely any Eohvorius in the powder, 

 but on oxiiiuining higher up. where the stem was as yet little dis- 

 coloured, and little if at all hollowed, I found the infestation markedly 

 present. 



Here I found the KeUvorms in a state of great activity, and in 

 extraordinary numbers, more numerously indeed than I remember 

 ever before seeing them together, and of all ages, from specimens 



Stkm Eeuvoum {TyleiH-hus iievKt^tati-is) ; anterior portion of femalo sho\yii\s: 

 n\outh-#poar ; and embryo in ogj; : all greatly magnitied (anterior portion magnideii 

 440 times). From ti^ures by Pr. J. Kitzonia Bos. 



apparently recently batched and quite transparetU. up to others which 

 appeared to be at about their full growth and showing their internal 

 structure. Besides these there were gi"eat numbers of eggs in different 

 stages of development. 



Those Stem Eelworms {T. tieva$tatri.r, scientifically) are very mmute 

 transparent white Threadworms, scarcely more than one-tweniy-tifth 

 of an inch in length at full growth, and only about one-thirtieth part 

 of their length at their greatest breadth. In shape they are very like 

 little eels (whence their common name). They multiply by laying 

 eggs, and are to be found in egg, and larval, and also in male and 

 female condition together in the infested plants. Other kinds of Eel- 

 worms may be present ; but with good microscopic power 1\ dfvas- 

 tatrix may to some degree be distinguished by having (like others of 

 the Tttle^mhi) a somewhat needle-shaped process, known as the spear, 

 placed on a three-lobird bulbous base in the cvsophagus. or gullet (see 

 above figure). The species cannot, however, be thoroughly identified 

 without examination of the male Eelworm for the presence of a bunkt, 

 or purse, near the tail extiemity. 



