Drconiaii Fish- I'liana of Sjntzbenjca. 9 



tioiii buuldors in Silcsiii under tlie preoccupied luuuc ut Gijro- 

 Ujns. The punctate cliavactcr ot" the gaiioine and the absence 

 of a |)e^-and-sockct aiticuhition suggest that the scales pertain 

 to Crossojiterygians allied to Osteolejns rather than to any 

 Actinopterygian fish. 



Porolepis posnam'ensi's f Kade) . 

 (PL II. figs. 6-10.) 



1858. Gyroptiichius posnaiikmsis, G. Kade, op. cit. p. 10, fi<i-8. (i, 7, 

 1858. Gyrolepis posnaniensis^Q. Kade, ibid. p. 18, tigs. 8-10. 



There are no satisfactory characters by -whicli the scales 

 from Spitzbergcn can be .specifically distinguished from those 

 discovered by Kade in the boulders of Silesia, and they must 

 thus at present receive the same name. The scales arc rect- 

 aiigular or only slightly rhomboidal in shape, and are rarely 

 broader than deep, but often deeper than broad. The 

 hinder margin is not serrated. The superficial wrinkles are 

 acute, prominent, nearly straight, and approximately parallel, 

 with occasional intercalations, but rarely branching j they are 

 usually confined to a narrow space bordering the superior and 

 anterior margins, and never seem to extend beyond the 

 diagonal connecting the postero-snperior and antero-inferior 

 angles. The punctations of the ganoine are very numerous 

 and coarse, arranged in single series between the wrinkles, 

 and occasionally displaying an oblique linear arrangement on 

 the unornamented portion of the scale, though more often 

 disposed in an irregular manner upon the last-named area. 



Coarsely tubeiculated fragments of bone are associated with 

 the scales in the flagstone of Klaas Billen Bay, and may 

 possibly belong to the same fish. 



The specimens named Gyroptychius jwsnaniensis by Kade 

 seem to the present writer to be abraded fragments of scales 

 specifically identical with the nearly complete specimens 

 described as Gyrolejns posiiam'ensis by the same author. 



Form, and hoc. Giey Micaceous Flagstone, Klaas Billen 

 Bay (very common) ; lied Micaceous Sandstone, Dickson 

 Bay (rare). 



