no BRITISH GALLS 



slenderness of their eel-like shape can hardly be conveyed 

 by statement of measurement, but when magnified 200 times, 

 so that they appear a little more than 8 inches in length, 

 their greatest magnified width hardly exceeds J inch." 

 Ova kept dry for six months will produce young, and young 

 eelworms can survive two years' drought. 



Tylenchus fucicola attacks Seaweeds. It causes oblong 

 swellings of the thallus with internal cavities in AscophyUmn 

 nodosum Le Jolis. It is also said to infest Furcellaria fastigiata 

 Lamouroux. See papers by Barton referred to in the 

 Bibliography. A species of Tylenchus, fucicola (?), infests 

 Chrondus crispus Stackhouse, and Rhodymenia palmata 

 Greville. Mr. A. D. Cotton, F.L.S., informs me that he 

 very frequently finds galls on Rhodymenia, but has failed to 

 discover eelworms in them. " It appears to me likely 

 that the wart-like swellings on Rhodymenia may sometimes be 

 produced by some other cause. I have also found galls not 

 infrequently on Ceramium rubrum, but am not aware that 

 anyone has explained their origin and character." 



Tylenchus graminis causes minute oval or elongated, dark 

 green or blackish pustules on the under surface of leaves in 

 the Sheep's Fescue Grass. 



Tylenchus millefoUi causes very marked distortion of the 

 entire plant in the Common Milfoil (Plate XV.). The 

 hypertrophy consists of globular growths about the size of 

 a hemp-seed, solitary or coalescent, yellowish-green at first, 

 becoming brown. Eiach swelling contains numerous worms. 

 These galls may be found throughout the summer and 

 autumn, but are by no means common. Our illustration is 

 from Plate XCVII. in Connold's "Vegetable Galls," wherein 

 these galls are unfortunately ascribed to the presence of the 

 larvae of the dipteron Rhopalomyia millefoliae, 



Tylenchus tritici deforms the Marsh Bent Grass, causing 

 elongated swellings about 5 mm. by 3 mm. at the base of the 

 leaf, and globular growths about i to 5 mm. in diameter on 

 the panicle. These hypertrophies are yellowish at first, 

 becoming red or purple at maturity. 



