540 



ZOOLOGY 



SECT. 



exceptionally among Amphipods is broad and depressed and 

 the legs curiously swollen. 



3. C a |a re I la 

 2. C y a m u s 

 FIG. 433. AmphipOda. 3, <t, male ; /-, female. (After Gerstaecker, and Bate and Westwood.) 



Among the Isopoda, one of the most interesting forms is the 

 common Wood-louse (Fig. 434, 1), which is almost unique among 

 Crustacea for its perfect adaptation to terrestrial life. The allied 



2. Armadillo 



3.Cy 



4. Cry pl-oniscus 



434. Isopoda. ./',, entire animal; '*, posterior end with attached rnale(//f); S t a, 



1>, adult female. (After Cuvier, Clans, and Gerstaecker.) 



"Pill-bugs" (Arinadillidiuni , ..') have the habit of rolling them 

 selves up into a ball when disturbed. Cymotlwa and its allies are 



larva 



iem- 



