it', JOHAN KL-ER. [SEC. ARCT. EXP. FRAM 



D e .- c r i p t i o n. I. A fragmentary scale (S. I. 25 a), with front 

 -ide well pre-erved. (PI. VIII, fig. 1 . In the figure the scale is turned 

 up and down in order to show the fine ornamentation with greater 

 effect. 



Tin 1 diameter of the scale must have been about 15 mm. Very fine 

 and -harp nl. which are somewhat interrupted, run' in a slightly arched 

 and convergent direction Inwards the back. 



Tin- inner ones divide forwards. The ribs continue forwards in fine 

 horse-shoe -haped tubercles, which appear to form a narrow zone shaped 

 like a half moon. 



In front of the latter we notice the remains of radial ribs, with 

 very fine tubercles, which most probably have occupied the central part 

 of the portion of the scale that was originally covered. At the sides 

 the latter >ho\vs a very fine, grained ornamentation, which can also he 

 seen between the rib>. 



One remarkable feature of this scale is the circumstance that the 

 rib- are slightly arched and converge posteriorly, and that they do not 

 appear to be arranged quite symmetrically. 



2. On other scales, the surface of which unfortunately is badly 

 piv-erved. the ribs have a more sub-parallel course and do not appear 

 to be .-.o closely situated as in the case of the previous specimen. The 

 larue-t scale appears to have had a diameter of about 20 mm. 



O b s e r v a t i o n s. As will be seen, these scales vary to some 

 e\lenl \\ith respect to ornament, but not so much that they cannot In- 

 referred to the same species, which probably may be identified with 

 < il/H>/<>lr)>is fKtncidens Ai;, The two species, dl. lei>toi>t<'nix Ac. and 

 l>tui< idens AG. which have about the same extent in Europe appear, 

 however, lo be difficult to differentiate when we have only isolated 

 -c.-de.-. lii A.SMIIII \Voni.\\ \HD'S Catalogue 1 , the scale> of both form- 

 an- de.-crihed by the same words. Judging from the scales we are in 



posers-ion of. i. e. Gl. iHuu-idi'Hs from the Orkney Islands, and fr 

 l'\\M.i;'s illu-tralion of (II. Ic/ifuji/ri-iis. the resemblance is greater in 

 lb' ca-r of the former, which appear- to have finer and more numerous 

 rib.- than Hie latter. 



Olyptolepis '//fr/;rrr>/.v/.s- \\'IIIT. J is much smaller than Hie above and 

 i- Ihen-lore mil of coiisideral 



V.-l. II. ,,. 332 and 336. 



I I isht -f tin- l)i-\.,n. |;,,rk- ,,!' Caiia.l;i. Tran>. lioy. Soc. Can., Vnl. \'l. 



