64 



Description of Plate IV. 



M<ie<nulrinns At;., Upper Devonian. River Aa al Wrmlen. 



Livland. Page 36. 

 Fig. 1. SiuTu.-.- of a body plat.-. X i\. Pal. Mus. Krist Univ. 



Drfiiu)i*i>is U<-niih)<letiensia Suii.i 'i.. Lower Devonian, Gemtinden, Germany 



I 'age 31. 



Fig. 2. S.irfa.-c of Inuly plate. X <-7. Pal. Mus. Krist. Univ. 



