JOIIAN KI.KIi. (-EC. ARCT. KXI'. FKAM 



Holoptychiidsie. 



Ilnlnfttycliius Scheii new specie-. 

 1 1 'I. VIII. figs .",-4). 



In my in;ilt'i-i;il there are several -cale.- of a large HoloptychlUS 

 I'linn all from the lisli hori/.on at Skrap Valley. Two only of these 

 permit of detailed study. 



Inscription. A large, broad. elongated scale (S. I. 2<). almost 

 completely preserved. ||'l. VIII, fig. 3). 



The breadth is i-4 inin.. lenght '.\-2 mm. As Ilie scale is somewhat 

 incomplete in the anterior portion and on Hie right side, the actual 

 breadth and length may presumably lie estimated at ^ mm. and .'15 mm. 

 respectively. The ornamentation of the exposed part consist of regular 

 nh>. alionl 1 mm. in breadth. The two middle ones are sub-parallel. 

 biit the others are bent and turn their convex side inwards. They thus 



it 



diverge towards the back margin. In trout these regular ribs are sup- 

 planted by irregular elevations, which are comparatively broader than 

 the nb-. 



i } . A little scale (S. I. 2:5). represented in I'l. VIII, tig. 4. It is almo>t 

 circular with a diameter of about \^ mm. The form and si/.e of the 

 \posed part are uniijne. for the latter extends at least 1 1 mm. forwards. 

 The rib- are powerful, and not ipiile I mm. in breadth: they branch 

 out dichotomously tin \\ards. ( In this scale, too, the outer ribs diverge 

 lo\\ard- the posterior margin. The original covered portion of the scale 

 i.- finely -rained. 



Observations. The-e iwn best preserved Holoi>t/ichinx scales, 

 and therefore the nio.-l minutely described. nm>l undoubtedly be a-sumed 

 I" In-long to the -aim- form. It is true, tbe.-e scales differ considerably 

 as regards size, form and ornamentation, but as A. SMITH WOODWARD 

 point- out. the scales vary very much even in different parts of the 

 -aim- -prciineii. A- they entirely agree in the backward diverging rib-. 

 I refer them to one and the same form. It seems to me that the lame 

 Scale \\a- situated on the .side of the lish. whil-t the small one possibly 

 belonged lu Hi,* dorsal line only. 



I o |iid-r from these two scale- the Kllesmere form is most nearly 

 related to JI<ilo/>/i/chinx t/ohil isxi in its A.. '. //. .\nnTicnnn*. from the 



A >MIIII \Vi.Mii\\ \iii>, Null-- mi >i>nii' l : p|irr I )r\i>iii:iii l'i--li liciniiin-> in K;i->l 

 (Jr.-,-,,!;,,,,!. ||;,|,. K. S\ Vet. Aka.l. ll.'iii.ll. -JC,. IV. N... Id. I'.MKI. ,,a-. 111. 



