218 60 



IdaJia jrfebeia, Bgh. 



Branchial leaf from the side. 55 X 

 Lateral plate of three rows. 

 Lateral and outer plate. 



Figs. 16—17 drawn by Cam. 350X 

 a oesophagns, b stomach, c bilious duct, d intestine. 

 Glans penis with armature of the inside. 350 X 



Atxjs naiicum (L.). 



Mandibular plate. 55 X 



Elements of the same. 



From the middle of the rasp, a median plates. 



Lateral plates. 



Figs. 21—23 drawn by Cam. (350 X) 



Fig 



.15, 



— 



16 



— 



17, 







18, 



— 



19, 



Fig. 



20. 



— 



21, 



— 



22. 



— 



23, 



