50 



QoBB — Nematodes, mostly Australian and Fijian. 



the proximal half, about twice as long as the tail or considerably longer than the 

 anal body-diameter ; no traces of accessory organs ; ejaculatory duct at least three 

 to four times as long as the spicula ; spermatozoa large and spherical ; lateral wings 

 or projections three, closely approximate, giving rise to four longitudinal Unas when 

 the lateral view is interpreted by the microscope. 



iTs^.— Roots of cabbage, potato, banana, radish, pea, peanut, cow-pea, bean, 

 squash, pumpkin, sanfoin, melon, cucumber, tomato, beet, plum, apricot, peach, 

 almond, fig, walnut, willow, gourd, begonia, sunflower, amaranth, dahlia, purslane, 

 egg-plant, spinach, maize, orange, grape, mulberry, morning-glory, petunia, spiraea, 

 buddleia, shepherd's purse, blackberry, and probably numerous other plants. New 

 South Wales, Queensland, and Victoria. 



2. T. devastatrix, Kuhn. 



8- 13- 81- 93- 

 1-8 2- 2-2 1-2 



1-6 mm. The cuticle is traversed by 



about one thousand plain transverse striae. The slightly convex-conoid neck termi 

 nates in a truncate head, the limits of whose 

 lip-region are not easily made out. The lips 

 are rudimentary, and there are no papillae, 

 unless they be represented by exceedingly 

 minute projections immediately round the nar- 

 row mouth-opening. The well-developed spear 

 is moved forward by three muscles passing 

 obliquely from the three bulbs to the outer 

 margin of the lip-region. The muscular ellip- 

 soidal median bulb, lying just in front of the 

 middle of the neck, has the same width as the 

 head ; its distinct three - chambered central 

 cavity is thickly lined with chitin, which serves 

 as the internal attachment of nucleated radial 

 muscles. Somewhat behind the oblique nerve- 

 ring the oesophageal tube begins to expand, 

 and, continuing to do so to the end, thus forms 

 a posterior bulb (fully one-fourth as long as the 

 neck), which always contains about three large 

 nuclei. These nuclei appear to me to indicate 

 that this bulb or swelling is glandular rather 

 than muscular in function. The intestine begins 

 as an exceedingly fine tube leading backward 

 from the oesophagus ; it soon becomes three- 

 fourths as wide as the body, and appears to be made up of two rows of cells 

 packed with coarse granules. The limits of the rectum are indefinite, but it 



a, lip-region. 

 6, tip of speai . 



c, median sucking-bulb. 



d, nerve-ring. 



e, excretory pore. 

 /, muscles for moving the spear 



forward. 



g, posterior oesophageal swell- 

 ing. 



A, excretory gland. 



i, hind end of spear. 



i, loop in ovary. 



k, right spiculum or penis. 



Z, muscles for opening the vulva. 



m, the vulva. 



n, glandular (?) bodies. 



0, bursa. 



p, hind end of ovary. 



q, uterus containing spermato- 

 zoa and one segmenting 

 egg at r. 



r, segmenting egg. 



s, vagina. 



t, the vulva or female sexual 

 opening. 



u, blind end of posterior rudi- 

 mentary ovary. 



V, intestine, showing its cellular 

 structure. 



w, cross-section of an egg. 



X, anus. 



y, wings of the cuticle. 



z, cross-section of the intestine. 



Fig. 9. — Side view of the devastating eel-worm. 



I, a female worm. II, head of the same worm 

 more highly magnified. Ill, tail of a male. IV, 

 view from below, of the female sexual opening. 

 V, cross-section of the worm passing through the 

 sucking-bulb. VI, front view of the penes and 

 their accessory parts. VII, cross-section through 

 the middle of a female, showing how the body- 

 cavity is filled completely by the ovary (w) and the 

 intestine (z). 



