18^-1902^^3^^a[^^^JJPPER DEVONIAN FISH REMAINS. 48 



Botliriolepis {?) sp. 

 (PL VIII, fig. 7). 



An interesting fragment of a large Asterolepide, fS. I. 5-6), is found 

 from the locality called S.O. Haken on the east side of Goose Fiord, 

 where the rocks appear to consist of a light grey, hard sandstone. 

 Unfortunately the specimen is very defective, and does not lend itself to 

 illustration. I will therefore content myself with a brief description. 



Description. It is a portion of an angular, bent body-plate, 

 presumably an anterior ventro-lateral plate. The length is about 75 mm. 

 As the specimen before us is merely a fragment, this measurement is 

 only a portion of the real length of the plate, which may be estimated 

 as at least 100 mm. The breath of the ventral portion of the plate in 

 the anteiior part is 25 mm. and backwards this increases to 30 mm. 

 The breath of the lateral (rising) part is about 65 mm. at its maximum. 

 The thickness of the plate is about 2.5 mm. 



On the inner side, which is best exposed, we observe a powerful 

 cross rib on the narrower part of the plate, — which latter I have 

 taken to be the ventral. The sculpture cannot be seen distinctly, but it 

 appears to be a coarse, nodose Bothriolepis sculpture. The structure, 

 which is seen on PI. VII. fig. 7, is coarse, but agrees closely with that 

 which is common in Bothriolepis; it appears distinctly on comparison 

 with PI. VII. fig. 8, which gives the structure of B. canadensis. 



Some quite small plate fragments with very coarse Bothriolepis 

 sculpture, from the fish horizon in Skrap Valley, possibly belong to the 

 same form. A larger fragment (S. I. 34 — 36) which lies in a red sand- 

 stone, may also be assigned to the same class, although with some 

 hesitation. 



Observations. We are here-dealing with fragments of a large 

 Asterolepide, the body armour of which, judging from the large piece 

 from S. 0. Haken, may be assumed to have been 23—25 cm. in length, 

 or thereabouts. It is thus a form that attained to approximately double 

 the size of Bothriolepis canadensis, Whiteaves, or about thrice the 

 size of the little form (described above) B. cf. hydrophila Ag. Judging 

 from the sculpture the former has also been a Bothriolepis form, the 

 more exact classification of which cannot be made at present. 



Horizon. The light grey, hard sandstone at S. 0. Haken on the 

 east side of the inner part of Goose Fiord, and presumcibly also from 

 the fish horizon in Skrap Valley. 



