"204 SLUGS, FLUKES, EELWORMS, ETC. 



also are sometimes confused with them, some obser- 

 vations may be desirable. 



In the following pages some notes are given on 

 Slugs ; and also on Water Snails, as a means of 

 dessemination of Liver Fluke in sheep ; also on 

 Eelworm attack to various crops ; also on Red Spider 

 and Hay Mites ; and on Millepedes, often known as 

 Julus-worms, or False Wireworms. 



Slugs are injurious to almost every kind of crop. 

 They belong to the Division Mollusca, thus described, 

 "Animal in pairs, the body and its appendages soft, 

 inarticulate (not jointed), enveloped in a muscular 

 skin, commonly called the mantle, which is extremely 

 variable in form, and has developed either within or 

 upon it a calcareous portion, consisting of one or 

 several pieces commonly called a shell."— Trans, from 

 De Blainville's ' Manuel de Malacologie et de Con- 

 chjdiologie,' given in Sowerby's ' Conchological 

 Manual,' p. 3. The Shell Snail, "Pond Snails" or 

 Limnaa, and Pond Mussels, are familiar examples of 

 Molluscs with shells ; the true Slugs or Lhnacidce have 

 a small morsel of a kind of shell-like formation some- 

 times shield-shaped, placed on the fore part of the back 

 under the skin called the mantle. 



The true Slugs may be generally described (when 

 extended or in movement) as being long, more or less 

 spindle-shaped, cylindrical or tumid, head prominent, 

 " tentacles " (commonly known as horns) four in 

 number, and two eyes placed on the tips of the 

 uppermost pair of horns (see 1 and 2, Fig. 153). 



When at rest or alarmed they draw themselves 

 together into a lump, as shown at 3, also Fig. 153. 



The Field or Milky Slug, Tj. cuircstis, figured at 1, 

 p. 198, is a somewhat spindle-shaped kind, about an 

 inch and a third long, greyish in colour, and with 

 milky slime, and is very common. 



The Arions, or Black Slugs, of which one is figured 

 in repose at 3, and less than nat. size at 2, p. 198, are 

 p>artly distinguishable by the skin being wrinkled, and 



