tit JOHAX KI.KR. [SEC. ARCT. EXP. FRAM 



triangular facet by which it overlapped the posterior ventro lateral plate. 

 \Vilhin the hrachial joint of the arm we see the inner cn>-- rih. In 

 front of tin- the plate i- incomplete and cannot he exactly limits 

 The proximal part of the arm. which is also seen from below, is well 

 pre-er\ed in the outer part: we here see the sculpture, the stron- 

 marginal spines and the suture between the external marginal plate and 

 the ventral anconeal plate 



The sculpture consists of a network of fine ribs without nodes. 



The anterior ventro lateral plate gives the impression of beinu 

 -hort and broad. The following dimensions may he determined on this 

 specimen: 



a. Length of anterior ventro lateral plate from the hack point to the 

 cros> rib within the hrachial joint \\) mm. 



b. Length of the proximal part of the arm 33 mm. 



c. Breadth of the proximale part of the arm ^ mm. 



2. Another specimen (S. I. 103). which is shown in 1M. VII. figs 

 -'3, gives the interior of a plate: I consider this to be an anterior 

 dorso-lateral plate. In front it is somewhat imperfect, but it- original 

 borders may be seen, especially on the left and posterior sides. Here 

 \\e observe line lino of growth parallel to the margin. Behind we 



a long facet with which this plate overlapped the posterior dor-" 

 lateral plate. The plate is short and broad, and gives the following 

 dimensions: 



a. Length 17 mm. 



b. Ureadth in the centre 1!) mm. 



c. Breadth farther forward ^(1 mm. 



3. II. \ll, tigs \^) shows the outer impression of a third plate 



S I. lOOi \\hich I regard as a fragment of a posterior dorso lateral 



plate. It -how- a triangular facet before the anterior dorso lateral plate. 



The x'lilplnre i- dearly vi-ible and consists of a network of line rih> 



without node-. 



In addition to the remain- of plate- from I lalge Valley docnbed 

 here in greater detail, there are al.-o not mfi eipiently unite small frag- 

 ments of plate- with >nmlar >cnlpture amongst the material from Skrap 

 Valley. It i- extremely probable that the-e remains also belong to the 

 -'line lorm. The majority are loo small and incomplete for us to 

 determine to which plates thev belong. Some can however be identified 



I . O 



a- fragment- of arm plate.-. The nio-t c plete. (S. I. L 2I) is depicted 



in I'l. \ll. liu.fi. I regard tin- -penmen to be a dor.-al articular plate 



