126 



SNAlIi-SLUG. 



[1899 



effects. The maggots, in the instances examined, were found dead "in 

 their cocoons." The cocoon in which the Pear Midge Maggot passes 

 the winter (for it does not change to chrysalis in it until early spring) 

 is spun of silk, covered with grains of sand, and, as the rather slighter 

 silk cocoons of the Raspberry caterpillars appear to offer no better 

 defence from action of surrounding chemicals, a trial of effect of an 

 autumn dressing might be well worth while. Notes on the successful 

 efl'ect of kainite as a preventive dressing for Pear Midge infestation 

 will be found preceding, under this heading. 



SNAIL-SLUG. 



(BENEFICIAL.) 

 Snail-slug. TestaceUa haliutidea, Draparnaud. 



S.CJC. 



Testacella haliotidea. — 1, Snail-slug, in motion ; 2, contracted ; S, head, with 

 tentacles, magnified ; 4, shell, upper and under side, slightly magnified ; 5, shell, 

 much magnified ; C, egg. (4 and from plate v. of Jefi'rey's ' British Conchology,' 

 vol. i. ; the other figures from specimens taken at St. Albans.) 



The Snail-slug greatly resembles several kinds of our common 

 garden and field Slugs, but is distinguishable from them by having a 

 small external shell placed near the end of the tail. From this 

 circumstance of possession of a noticeable shell (although certainly it 

 is a very little one) the creature takes its popular name of the Snail- 

 slug ; but, so far as my own experience goes, the point which most 

 frequently attracts attention to these Snail-slugs not being of the com- 

 mon plant-eating kinds is their being found in the act of swallowing, 



