8 4 



SYSTEMATIC ZOOLOGY 



thus exhibit various brilliant changing colors. Some are exces- 

 sively fragile. One of the most graceful is the band-shaped 

 Venus' girdle (Fig. J2), which is often about thirty centimeters 

 long and sometimes attains a length of a meter and a half ; the 

 young of this species is not band-shaped (Fig. 73 ). 



Fig. 73. Larval stage of the Venus' birdie, Cestus veneris. (Drawn from a Leuckart- 

 Nitsche wall-chart, by the author; permission of Dr. C. Chun.) 



