40 Gr. O. Sars. 



Explanation of the Plates. 



pi. i. 



Apus nurnidicus, Grube. 



Fig-. 1. Fully grown male, drawn from life, dorsal view; 

 magnified about 3 1 /* diameters. 



» 2. Fully grown female, exhibited in the same attitude 

 and with the same amplification. 



■» 3. Leg of 2nd pair in male, magnified about 13 diam. 



» 4. Same leg in female. 



» 5. Extremity of tail, with bases of the caudal filaments T 

 dorsal view. 



» 6. Same part, ventral view. 



7. Part of a caudal filament, highly magnified. 



» 8. Ovum in the moment of protrusion of the embryo- 

 capsule, magnified about 20 diam. 



» 9. The embryo-capsule, after having escaped from the 

 ovum, with the enclosed nauplius in a lateral view; 

 magnified 56 diam. 



» 10. Just hatched larva (nauplius); ventral view. 



»11. Same larva, after the lapse of 24 hours, ventral view. 



